CN103856404B - Data transmission method, device and system in a kind of looped network - Google Patents

Abstract

The embodiment of the invention discloses the data transmission method in a kind of looped network, device and system.The embodiment of the present invention is used and receives message on the building ring of MPLS TP looped networks, wherein, the message includes ring label, label switched path label, pseudo line tag and payload, and label switched path label includes the ring mark of purpose ring and the node identification of destination node, pseudo line tag includes the ring mark of source ring and the node identification of source node, then, ring label in the message, label switched path label, pseudo line tag inquires about preset not intercommunication list, to determine the need for forwarding the packet to next-hop node, if desired, then forward the packet to next-hop node, if need not, then omit the operation for forwarding the packet to next-hop node；The program not only can simply and neatly realize the intercommunication and not intercommunication between node, improve efficiency of transmission, and, also allow for follow-up maintenance.

Description

A data transmission method, device and system in a ring network

technical field

The invention relates to the field of communication technology, in particular to a data transmission method, device and system in a ring network.

Background technique

In recent years, with the development of mobile communication technology, communication services, especially Internet Protocol (IP, Internet Protocol) services are also increasing year by year. In order to meet the growing needs of IP services, various data transmission methods based on IP services have emerged. The ring network technology based on multi-protocol label switching (MPLS-TP, MultiProtocol LabelSwitching Transport Profile) is one of them.

MPLS-TP technology, for example, can adopt a ring topology and a double-ring structure, wherein the outer ring is also called a working ring, and the inner ring is also called a protection ring. The outer ring is clockwise and the inner ring is anticlockwise and bidirectionally transmits data at the same time. The outer ring carries the management byte of the inner ring data packet, and the inner ring carries the management byte of the outer ring data packet, so that the two rings can protect and backup each other and improve data transmission. security.

The data transmission mode of the existing MPLS-TP ring network is not flexible enough, which is not conducive to improving the transmission efficiency.

Contents of the invention

Embodiments of the present invention provide a data transmission method, device and system in a ring network, which can flexibly realize intercommunication or non-intercommunication between nodes, and improve transmission efficiency.

In the first aspect, a data transmission method in a ring network is provided, including:

Receive a message on the working ring of the MPLS-TP ring network, the message includes a ring label, a label-switched path label, a pseudowire label and a payload, and the label-switched path label includes the ring identifier of the destination ring and the destination node The node identifier of the pseudowire label includes the ring identifier of the source ring and the node identifier of the source node;

Querying a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to a next-hop node;

If it is determined that the message needs to be forwarded to the next-hop node, then forward the message to the next-hop node;

If it is determined that the packet does not need to be forwarded to the next-hop node, the operation of forwarding the packet to the next-hop node is omitted.

In a first possible implementation manner, in combination with the first aspect, querying a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message is Before forwarding to the next hop node, it also includes:

Querying the list of terminated loop return packets according to the label switched path label in the packet to determine whether it is a loop;

If it is determined to be a loop, discard the message;

If it is determined that it is not a loop, then trigger execution according to the ring label, label switching path label, and pseudowire label in the message to query the preset non-interworking list to determine whether the message needs to be forwarded to the next hop node operate.

In a second possible implementation manner, in combination with the first possible implementation manner of the first aspect, the querying of the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the packet , before determining whether to forward the message to the next hop node, it also includes:

determining that the packet is a multicast packet;

The message is copied, and the copied message is sent to the virtual forwarding instance or the virtual leased line of the current node.

In a third possible implementation manner, in combination with the first possible implementation manner of the first aspect, querying a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the packet , before determining whether to forward the message to the next hop node, it also includes:

determining that the packet is a unicast packet;

When it is determined that switching is required according to the label switched path label in the message, it is triggered to query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether all of them need to be switched. Describe the operation of forwarding the message to the next hop node;

When it is determined that the POP is popped according to the label switched path label in the message, the message is sent to the virtual forwarding instance or the virtual leased line of the current node.

In a fourth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, the forwarding the message to the next-hop node includes:

Detecting the link and the next hop node of the working ring of the MPLS-TP ring network;

If a link failure is detected, then protection switching is performed, and the message is sent to the next hop node through the protection ring of the MPLS-TP ring network;

If the failure of the next hop node is detected, then protection switching is performed, and the message is sent to the next hop node of the next hop node by using the path bypassing the faulty node through the protection ring of the MPLS-TP ring network;

If neither link failure nor next-hop node failure is detected, the message is forwarded to the next-hop node through the working ring of the MPLS-TP ring network.

In the fifth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, if the working ring of the MPLS-TP ring network includes a core working ring and an access working ring ring, then the described message is forwarded to the next hop node, including:

If the next hop node is located on the core working ring and is the primary intersecting ring point, when it is determined that multiple links related to the next hop node fail, or when it is determined that the next hop node fails , using the backup intersecting ring point to transmit the message to the access working ring through the protection ring of the MPLS-TP ring network.

In the sixth possible implementation manner, in combination with the fifth possible implementation manner of the first aspect, when it is determined that multiple links related to the next-hop node fail, the MPLS-TP ring network protection ring, using the backup intersecting ring point to transmit the message to the access working ring, including:

When it is determined that multiple links related to the next hop node fail, the next hop node notifies the standby intersecting ring point to connect to the blocking point of the working ring, so as to pass the protection of the MPLS-TP ring network ring, using the backup intersecting ring point to transmit the message to the access working ring.

In the seventh possible implementation manner, in combination with the fifth possible implementation manner of the first aspect, when it is determined that the next hop node fails, the protection ring of the MPLS-TP ring network is used to use the backup intersecting The ring point transmits the message to the access working ring, including:

When it is determined that the next hop node fails, the standby intersecting ring point senses the failure of the primary intersecting ring point and connects to the blocking point of the working ring, so that the standby intersecting ring can be used through the protection ring of the MPLS-TP ring network. The ring point transmits the message to the access working ring.

In the eighth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, if the working ring of the MPLS-TP ring network includes a core working ring and an access working ring ring, then:

If the current node is located on the core working ring and is the main intersecting ring point, when the message is sent to the next hop node located on the access working ring, the intersection table item is refreshed;

If the current node is located on the core working ring and is a standby intersecting ring point, when the connection relationship between the current node and the virtual forwarding instance/virtual leased line of the current node changes from blocking to non-blocking, or from non-blocking to When it is blocked, all entries on the current node are cleared, and the initial state of the virtual forwarding instance/virtual leased line attached to the access working ring is blocked.

In a second aspect, a data transmission device in a ring network is provided, including a receiving unit, a query unit, a sending unit, and a blocking unit;

The receiving unit is used to receive a message on the working ring of the MPLS-TP ring network, the message includes a ring label, a label switched path label, a pseudowire label and a payload, and the label switched path label includes the destination ring a ring identifier and a node identifier of a destination node, wherein the pseudowire label includes a ring identifier of a source ring and a node identifier of a source node;

A query unit, configured to query a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to a next-hop node;

a sending unit, configured to forward the message to the next-hop node when the query unit determines that the message needs to be forwarded to the next-hop node;

A blocking unit, configured to omit the operation of forwarding the message to the next-hop node when the query unit determines that the message does not need to be forwarded to the next-hop node.

In a first possible implementation manner, with reference to the first aspect, the data transmission device further includes a determining unit;

The determination unit is configured to query the list of terminated loop return packets according to the label switched path label in the packet to determine whether it is a loop, and if it is a loop, discard the packet; if it is not a loop, trigger The query unit performs an operation of querying a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to a next-hop node.

In the second possible implementation manner, in combination with the first possible implementation manner of the first aspect, wherein:

The sending unit is further configured to determine that the message is a multicast message, copy the message, and send the copied message to a virtual forwarding instance or a virtual leased line of the current node.

In a third possible implementation manner, in combination with the first possible implementation manner of the first aspect, wherein:

The sending unit is also used to determine that the message is a unicast message; when it is determined that the switch needs to be switched according to the label switching path label in the message, trigger the query unit to perform the ring label and label switching according to the label in the message. The path label and the pseudowire label query the preset non-communication list to determine whether the message needs to be forwarded to the next hop node; when the label switching path label in the message is determined to be a pop-up POP, Send the message to the virtual forwarding instance or virtual leased line of the current node.

In a fourth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, the sending unit is specifically configured to:

Detecting the link and the next hop node of the working ring of the MPLS-TP ring network;

If a link failure is detected, protection switching is performed, and the message is sent to the next hop node through the protection ring of the MPLS-TP ring network; if a failure of the next hop node is detected, protection switching is performed, and the MPLS - the protection ring of the TP ring network, using the path bypassing the faulty node to send the message to the next hop node of the next hop node;

If neither link failure nor next-hop node failure is detected, the message is forwarded to the next-hop node through the working ring of the MPLS-TP ring network.

In the fifth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, if the working ring of the MPLS-TP ring network includes a core working ring and an access working ring ring, the sending unit is specifically used for:

If the next hop node is located on the core working ring and is the primary intersecting ring point, when it is determined that multiple links related to the next hop node fail, or when it is determined that the next hop node fails , using the backup intersecting ring point to transmit the message to the access working ring through the protection ring of the MPLS-TP ring network.

In a sixth possible implementation manner, in combination with the fifth possible implementation manner of the first aspect, the sending unit is specifically configured to:

If the next hop node is located on the core working ring and is the primary intersecting ring point, when it is determined that multiple links related to the next hop node fail, the next hop node notifies the standby intersecting ring point The blocking point of the access working ring is mounted, so as to transmit the message to the access working ring by using the backup intersecting ring point through the protection ring of the MPLS-TP ring network.

In a seventh possible implementation manner, in combination with the fifth possible implementation manner of the first aspect, the sending unit is specifically configured to:

If the next hop node is located on the core working ring and is the main intersecting ring point, when it is determined that the next hop node fails, the standby intersecting ring point senses the failure of the main intersecting ring point and connects to the active intersecting ring point. The blocking point is used to transmit the message to the access working ring by using the backup crossing ring point through the protection ring of the MPLS-TP ring network.

In the eighth possible implementation manner, in combination with the first aspect and any one of the first to third possible implementation manners of the first aspect, if the working ring of the MPLS-TP ring network includes a core working ring and an access working ring ring, the data transmission device in the ring network also includes a refresh unit, specifically for:

If the current node is located on the core working ring and is the main intersecting ring point, when the message is sent to the next hop node located on the access working ring, the intersecting point entry is refreshed;

If the current node is located on the core working ring and is a standby intersecting ring point, when the connection relationship between the current node and the virtual forwarding instance/virtual leased line of the current node changes from blocking to non-blocking, or from non-blocking to When it is blocked, all entries on the current node are cleared, and the initial state of the virtual forwarding instance/virtual leased line attached to the access working ring is blocked.

In a third aspect, a communication system is provided, including any data transmission device in a ring network provided by the embodiments of the present invention.

In the embodiment of the present invention, the message is received on the working ring of the MPLS-TP ring network, wherein the message is encapsulated by MPLS, and the message includes a ring label, a label switching path label, a pseudowire label and a payload, and the label The switch path label includes the ring identifier of the destination ring and the node identifier of the destination node, and the pseudowire label includes the ring identifier of the source ring and the node identifier of the source node. Then, according to the ring label, label switching path label, pseudowire The label queries the preset non-communication list to determine whether the message needs to be forwarded to the next-hop node. If necessary, the message is forwarded to the next-hop node. If not, the message is omitted The operation forwarded to the next hop node; since a non-communication list is maintained in this scheme, and whether the nodes can communicate with each other is determined by querying the non-communication list, it is not only simple and flexible to realize the inter-node Intercommunication and no intercommunication can improve transmission efficiency and facilitate subsequent maintenance.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flowchart of a data transmission method in a ring network provided by an embodiment of the present invention;

Figure 2a is a schematic diagram of a scenario of an MPLS-TP ring network provided by an embodiment of the present invention;

Fig. 2b is another flow chart of the data transmission method in the ring network provided by the embodiment of the present invention;

Fig. 3 is another flow chart of the data transmission method in the ring network provided by the embodiment of the present invention;

FIG. 4a is a schematic diagram of a scene when a link failure occurs in an MPLS-TP ring network provided by an embodiment of the present invention;

FIG. 4b is a schematic diagram of a scene when a node failure occurs in an MPLS-TP ring network provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of another scenario of an MPLS-TP ring network provided by an embodiment of the present invention;

FIG. 6a is a schematic diagram of a scene when a multi-point failure occurs in an MPLS-TP ring network provided by an embodiment of the present invention;

FIG. 6b is a schematic diagram of a scenario when a failure occurs at a primary intersecting ring point in an MPLS-TP ring network provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of a data transmission device in a ring network provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

Embodiments of the present invention provide a data transmission method, device and system in a ring network. Each will be described in detail below.

Embodiment one,

This embodiment will be described from the perspective of the data transmission device in the ring network. Specifically, the data transmission device in the ring network may be integrated in routers, and these routers may serve as nodes in the MPLS-TP ring network. For example, the MPLS-TP ring network can bear integrated services, such as unicast services and multicast services.

A data transmission method in a ring network, comprising: receiving a message on a working ring of an MPLS-TP ring network, wherein the message includes a ring label, a label switching path label, a pseudowire (PW, Pseudo Wire, also Label and payload, Label Switched Path (LSP, Label Switched Path) label includes the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label includes the ring ID of the source ring and the node ID of the source node ; Query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next hop node; if it is determined that the message needs to be forwarded Forward to the next hop node, then forward the message to the next hop node; if it is determined that the message does not need to be forwarded to the next hop node, then omit the operation of forwarding the message to the next hop node .

As shown in Figure 1, the specific process can be as follows:

101. Receive the message on the working ring (that is, the outer ring) of the MPLS-TP ring network.

Wherein, the message can be a multicast message or a unicast message. The difference from the message in the existing ring network is that the message adopts Multi-Protocol Label Switching (MPLS, Multi-Protocol Label Switching) Encapsulation (the existing message is forwarded according to the MAC), that is, the message can include the ring label (ring label), label switching path label (lsp label), pseudowire label (pw label) and payload, That is, the format of the message is "ring label + label switched path label + pseudowire label + payload".

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID (dring id) of the destination ring and the node ID (dleaf id) of the destination node, and the pseudowire label can be It includes the ring ID (sring id) of the source ring and the node ID (sleaf id) of the source node.

102. Query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node, and if the message needs to be forwarded to If the next hop node is selected, step 103 is performed; if the message does not need to be forwarded to the next hop node, step 104 is performed.

Wherein, the non-interworking list may include a ring ID (ring id) and a node ID (leaf id), which are used to indicate whether the nodes are interoperable, so that the pre-checked information can be queried through the ring label, label switching path label, and pseudowire label in the message. It can be determined whether the message needs to be forwarded to the next-hop node through the configured non-interworking list.

Among them, before the step "query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node (that is, step 102)" , you can also determine whether a loop is currently formed. If it is not a loop, check the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded. For the next hop node, if a loop has been formed, the message can be discarded, that is, in the step "query the preset non-interworking list according to the ring label, label switching path label, and pseudowire label in the message, to Before determining whether the message needs to be forwarded to the next hop node", the method may also include:

According to the label switching path label in the message, query the list of the termination ring return message to determine whether it is a loop, if it is a loop, discard the message; if it is not a loop, execute "according to the ring label in the message , label switched path label, and pseudowire label to query the preset non-interworking list to determine whether the message needs to be forwarded to the next hop node" (that is, step 102).

In addition, after each node receives the message, it can further process the message according to the different transmission methods of the message. For example, for multicast, it can also copy a message and send it to To the virtual forwarding instance (VSI, Virtual Switch Instance) or virtual leased line (VLL, VirtualLeasedLine) of the current node, so that the VSI or VLL can refresh the access media layer (MAC, Media Access Control) address list according to the copied message , and forward the packet within the VSI or VLL; and for unicast, it can be swapped directly on the ring when it is determined according to the label switching path label in the packet that it needs to be swapped (swap). ring swap), and if it is determined to be a pop-up (POP) according to the label switching path label in the message, it will enter the VSI or VLL and perform the internal forwarding behavior of the VSI or VLL; that is, in the step "according to the message in the Before the ring label, label switched path label, and pseudowire label query the preset non-interworking list to determine whether the packet needs to be forwarded to the next-hop node (that is, step 102), the method may also include:

(1) Multicast;

Determine that the message is a multicast message, copy the message (that is, a multicast message), and send the copied message to the VSI or VLL of the current node, so that the VSI or VLL can refresh the MAC address according to the copied message list, and forward the message inside the VSI or VLL.

(2) Unicast;

It is determined that the packet is a unicast packet, and when it is determined that swap is required according to the label switching path label in the packet, execute "query the preset non-interworking list to determine whether the message needs to be forwarded to the next hop node” step; when the label switching path label in the message is determined to be POP, the message is sent to the VSI or VLL of the current node, So that the VSI or VLL refreshes the MAC address list according to the message, and forwards the message inside the VSI or VLL.

It should be noted that, for unknown unicast packets, they are also processed according to multicast, which will not be repeated here.

103. If it is determined that the packet needs to be forwarded to the next-hop node, forward the packet to the next-hop node.

For example, specific link detection and node detection can be performed. If both are normal (that is, there is no fault), the message will be forwarded to the next hop node directly through the working ring. Otherwise, if a link failure or node failure is found, then the Protection switching, that is, step 103 may specifically be as follows:

Detect the link and the next hop node of the working ring of the MPLS-TP ring network,

If a link failure is detected, protection switching is performed, and the message is sent to the next hop node through the protection ring (ie inner ring) of the MPLS-TP ring network;

If the failure of the next hop node is detected, protection switching will be performed, and the message will be sent to the next hop of the next hop node through the protection ring (that is, the inner ring) of the MPLS-TP ring network by using the path that bypasses the faulty node node;

If neither link failure nor next-hop node failure is detected, the message is forwarded to the next-hop node through the working ring of the MPLS-TP ring network.

In addition, it should be noted that the MPLS-TP ring network may be a single ring or multiple rings such as double rings. Wherein, the dual ring may include a core working ring and an access working ring, wherein the core working ring and the access working ring may include two intersecting ring points, one is a primary intersecting ring point, and the other is a standby intersecting ring point, wherein, for For the VSI or VLL of the two nodes, the primary intersecting ring point and the standby intersecting ring point, they need to be mounted on the core working ring and the access working ring respectively. However, for the standby intersecting ring point In other words, the initial state of its VSI or VLL connected to the working ring is blocked. Only when the master intersecting ring notifies the standby intersecting ring to attach the blocking point, or when the standby intersecting ring detects that the main intersecting ring fails, the backup Intersecting ring points will connect (that is, hook up) the choke point.

If the working ring of the MPLS-TP ring network includes a core working ring and an access working ring, then the step "forwarding the message to the next hop node" can specifically be as follows:

If the next hop node is located on the core working ring and is the main intersecting ring point, when it is determined that multiple links related to the next hop node fail (that is, a multi-point failure occurs), or when determining the following When a one-hop node fails, the backup intersecting ring point is used to transmit the message to the access working ring through the protection ring of the MPLS-TP ring network; the details can be as follows:

When it is determined that multiple links related to the next hop node fail, the next hop node notifies the standby intersecting ring point to connect to the blocking point of the working ring, so as to pass through the protection ring of the MPLS-TP ring network , using the backup intersecting ring point to transmit the message to the access working ring.

When it is determined that the next hop node fails, the standby intersecting ring point senses the failure of the primary intersecting ring point and connects to the blocking point of the working ring, so as to use the backup intersecting ring point through the protection ring of the MPLS-TP ring network The message is transmitted to the access working ring.

In addition, depending on the location of the current node, the follow-up processing that needs to be performed will also be different. For example, the details can be as follows:

If the current node (that is, the execution subject of steps 101 to 104) is located on the core working ring and is the main intersecting ring point, when sending the message to the next-hop node on the access working ring, it needs to refresh Intersection point entry, where the intersection point entry may include a ring ID and a node ID, and is mainly used for judging whether to terminate the message when receiving a message with the current node as the source node from other interfaces (that is, In this case, loopback).

And if the current node (that is, the execution subject of steps 101 to 104) is located on the core working ring and is a standby intersecting ring point, then when the connection relationship between the current node and the VSI or VLL of the current node changes from blocking to non-blocking , or when changing from non-blocking to blocking, all entries on the current node also need to be cleared, wherein the initial state of the VSI or VLL attached to the access working ring is blocking.

104. If it is determined that the packet does not need to be forwarded to the next-hop node, omit the operation of forwarding the packet to the next-hop node.

For example, omitting the operation of forwarding the message to the next hop node may specifically be no action, such as not processing the message, or discarding the message or blocking the message, etc. repeat.

As can be seen from the above, in this embodiment, the message is received on the working ring of the MPLS-TP ring network, wherein the message is encapsulated by MPLS, and the message includes a ring label, a label switching path label, a pseudowire label and a payload , and the label-switched path label includes the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label includes the ring ID of the source ring and the node ID of the source node. Then, according to the ring label in the message, the label-switched path label 、Pseudowire label queries the preset non-communication list to determine whether the message needs to be forwarded to the next hop node, if necessary, forward the message to the next hop node, if not, omit all Describe the operation of forwarding the message to the next hop node; because in this scheme, MPLS is used to encapsulate the message, so when the message is transmitted on the ring network, there is no need to refresh the MAC table, so the switching speed can be improved; Moreover, in this scheme, a non-communication list is maintained, and whether nodes can communicate with each other is determined by querying the non-communication list. Therefore, not only the intercommunication and non-communication between nodes can be realized simply and flexibly, but also the improvement of The transmission efficiency is high, and it is also convenient for subsequent maintenance.

According to the method described in Example 1, examples will be given in Examples 2, 3, 4 and 5 below for further detailed description.

Embodiment two,

In this embodiment, the data transmission device in the ring network is specifically a ring network processing module, which is specifically integrated in a router, and the router is used as a node in the MPLS-TP ring network as an example for description.

As shown in Figure 2a, an MPLS-TP ring network can be established based on Ethernet. The MPLS-TP ring network includes a working ring (ie, the outer ring) and a protection ring (ie, the inner ring). Each node in the network is connected. For the convenience of description, in this embodiment, the MPLS-TP ring network includes node A, node B, node C and node D as an example for illustration, wherein each node includes Ring network processing module (such as RPR module or MPLS-TP ring network module, etc.) The transmission route of the text.

Among them, in order to distinguish between different nodes, each root and each node has an identity, for example, the identity of the root is the root ID (root id), the identity of the node is the node ID (leafid), and, in When encapsulating the packets on the network side, these identifiers can also be encapsulated in the packets, that is, the format of the packets on the network side can be shown in Table 1:

Table I

ring label label switched path label Pseudowire tags Payload

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID (dring id) of the destination ring and the node ID (dleaf id) of the destination node, and the pseudowire label can be It includes the ring ID (sring id) of the source ring and the node ID (sleaf id) of the source node.

In addition, each node will be configured with a non-interworking list, where the non-interworking list may include a ring ID (ring id) and a node ID (leaf id), which are used to indicate whether the nodes are interoperable, so that through The ring label, label switched path label, and pseudowire label query the preset non-communication list to determine whether the packet needs to be forwarded to the next-hop node.

In addition to configuring the non-communication list, in order to avoid loopbacks, the source node also needs to configure the list of ring termination messages. The list of ring termination messages can include the ring ID (ring id) and the node ID (leaf id). In this way, According to the label switching path label in the message, by querying the list of the terminating ring return message, it can be determined whether a loop has been formed (that is, whether to return to the source node) for further processing. For example, if it is a loop, then Discard the message; if it is not a loop, execute "query the preset non-communication list according to the ring label, label switching path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next hop node " steps, and so on.

Based on the structure of the MPLS-TP ring network shown in Figure 2a, the following will take multicast as an example to describe its execution process in detail.

Among them, it should be noted that whether the current message is a multicast message can be determined in a variety of ways. For example, a multicast message can use a specific ring ID and node ID. In this way, according to the ring ID and node ID, the Whether the current packet is a multicast packet can be identified, or an additional identifier can be used to indicate whether the current packet is a multicast packet, etc., which will not be repeated here.

As shown in Figure 2b, a data transmission method in a ring network, the specific process may be as follows:

201. The source access node A is the loop-up point, and the VSI (or VLL) of the source access node A receives the initial message sent by the multicast source.

202. After the VSI (or VLL) of the source access node A determines that the initial packet is a multicast packet, the ring network processing module performs MPLS encapsulation on the initial packet.

Wherein, the encapsulated message may include a ring label, a label switched path label, a pseudowire label and a payload.

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label can include the ring ID of the source ring and the source The node ID of the node.

For example, the initial packet can be encapsulated as: the ring identifier of the destination ring is "ring1", the node identifier of the destination node is a specific value multicast id, the ring identifier of the source ring is "ring1", and the node identifier of the source node is " root1", and mark the packet as a multicast packet in the reserved word of the ring label.

203. The ring network processing module of the source access node A configures the list of terminated ring return packets.

Wherein, the message list of the terminating ring may include a ring ID and a node ID. In this way, according to the label switching path label in the message, by querying the list of the terminating ring returning message, it can be determined whether a loop has been formed currently (that is, whether a loop is returned or not). to the source node).

For example, it can be configured in the termination ring return message list: when the ring ID of the source ring is received as "ring1" and the node ID of the source node is "root1", it is determined to be a loop.

204. The VSI (or VLL) of the source access node A refreshes the MAC address list according to various information in the encapsulated message, such as the MAC address, ring ID, and node ID, and internally updates all The message is forwarded.

205. The ring network processing module of the source access node A queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded For the next hop node B, if it is necessary to forward the encapsulated message to the next hop node B, then perform step 206; if it is not necessary to forward the encapsulated message to the next hop node B, then omit the encapsulation The operation of forwarding the subsequent message to the next hop node B.

Wherein, the non-interworking list may include ring identifiers and node identifiers, which are used to indicate whether the nodes are interoperable, so that the preset non-interworking list can be queried through the ring label, label switched path label, and pseudowire label in the message. It is determined whether the message needs to be forwarded to the next hop node B.

206. If it is determined that the message needs to be forwarded to the next-hop node B, the ring network processing module of the source access node A sends the encapsulated message to the next-hop node B through the working ring.

207. The ring network processing module of node B receives the encapsulated message, determines that the encapsulated message is a multicast message, then copies the encapsulated message, and sends the copied message to the VSI (or VLL), so that the VSI (or VLL) refreshes the MAC address list according to the copied message, and forwards the copied message inside the VSI (or VLL).

208. The ring network processing module of Node B queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded to the next Jumping node C, if it is necessary to forward the encapsulated message to the next hop node C, then perform step 209; if it is not necessary to forward the encapsulated message to the next hop node C, then omit the packaged message The operation of forwarding the text to the next hop node C.

Wherein, steps 207 and 208 may be performed in no particular order.

It should be noted that at this time, the list of termination ring return packets can also be queried according to the label switched path label in the encapsulated packet to determine whether a loop is formed, because in this embodiment, the ring identifier of the source ring is "ring1" , the node identifier of the source node is "root1", therefore, a loop is not formed at this time, therefore, step 208 can be directly executed.

209. If it is determined that the message needs to be forwarded to the next-hop node C, the ring network processing module of the node B sends the encapsulated message to the next-hop node C through the working ring.

210. The ring network processing module of node C receives the encapsulated message, determines that the encapsulated message is a multicast message, then copies the encapsulated message, and sends the copied message to the VSI (or VLL), so that the VSI (or VLL) refreshes the MAC address list according to the copied message, and forwards the copied message inside the VSI (or VLL).

211. The ring network processing module of node C queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded to the next Jump node D, if it is necessary to forward the encapsulated message to the next hop node D, then perform step 212; if it is not necessary to forward the encapsulated message to the next hop node D, then omit the packaged message The operation of forwarding the text to the next hop node D.

Wherein, steps 210 and 211 may be executed in no particular order.

It should be noted that at this time, the list of termination ring return packets can also be queried according to the label switched path label in the encapsulated packet to determine whether a loop is formed, because in this embodiment, the ring identifier of the source ring is "ring1" , the node identifier of the source node is "root1", therefore, a loop is not formed at this time, therefore, step 211 can be directly executed.

212. If it is determined that the message needs to be forwarded to the next-hop node D, the ring network processing module of node C sends the encapsulated message to the next-hop node D through the working ring.

213. The ring network processing module of node D receives the encapsulated message, determines that the encapsulated message is a multicast message, then copies the encapsulated message, and sends the copied message to the VSI (or VLL), so that the VSI (or VLL) refreshes the MAC address list according to the copied message, and forwards the copied message inside the VSI (or VLL).

214. The ring network processing module of node D queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded to the next Jump node A, if it is necessary to forward the encapsulated message to the next hop node A, then perform step 215; if it is not necessary to forward the encapsulated message to the next hop node A, then omit the packaged message The operation of forwarding the text to the next hop node A.

Wherein, steps 213 and 214 may be executed in no particular order.

It should be noted that at this time, the list of termination ring return packets can also be queried according to the label switched path label in the encapsulated packet to determine whether a loop is formed, because in this embodiment, the ring identifier of the source ring is "ring1" , the node identifier of the source node is "root1", therefore, a loop is not formed at this time, therefore, step 215 can be directly executed.

215. If it is determined that the message needs to be forwarded to the next-hop node A, the ring network processing module of node D sends the encapsulated message to the next-hop node A through the working ring.

216. After receiving the encapsulated packet, the ring network processing module of the source access node A queries the list of termination ring return packets according to the label switching path label in the encapsulated packet. Since the ring identifier of the source ring is "ring1" , the node ID of the source node is "root1", so it is determined to be a loop, so the packet is discarded.

As can be seen from the above, in this embodiment, the multicast message is received on the working ring of the MPLS-TP ring network, wherein the multicast message is encapsulated by MPLS, and the multicast message includes a ring label, a label switching path label, and a pseudowire label and payload, and the label switched path label includes the ring identifier of the destination ring and the node identifier of the destination node, and the pseudowire label includes the ring identifier of the source ring and the node identifier of the source node. Then, according to the ring label in the multicast message, The label switching path label and the pseudowire label query the preset non-communication list to determine whether the multicast message needs to be forwarded to the next-hop node, and if necessary, forward the multicast message to the next-hop node. If not needed, omit the operation of forwarding the multicast message to the next hop node; in this scheme, MPLS is used to encapsulate the message, so when the message is transmitted on the ring network, there is no need to refresh MAC table, so the switching speed can be improved; moreover, because in this scheme, a non-communication list is maintained, and it is determined whether nodes can communicate with each other by querying the non-communication list, therefore, not only simple and flexible implementation Intercommunication and non-intercommunication between nodes improves transmission efficiency and facilitates subsequent maintenance.

Embodiment three,

Same as the second embodiment, the data transmission device in the ring network is specifically a ring network processing module, which is specifically integrated in a router, and the router is used as a node in the MPLS-TP ring network as an example for illustration. Different from Embodiment 2, in this embodiment, unicast will be used as an example for description.

As shown in Figure 3, a data transmission method in a ring network, the specific process can be as follows:

301. The source access node A is the loop-up point, and the VSI (or VLL) of the source node A obtains the initial packet.

302. After the VSI (or VLL) of source access node A determines that the initial packet is a unicast packet, the ring network processing module performs MPLS encapsulation on the initial packet.

Wherein, the encapsulated message may include a ring label, a label switched path label, a pseudowire label and a payload.

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label can include the ring ID of the source ring and the source The node ID of the node.

For example, the initial packet can be encapsulated as: the ring ID of the destination ring is "ring1", the node ID of the destination node is "root2", the ring ID of the source ring is "ring1", and the node ID of the source node is "root1" .

Wherein, "root1" is the node ID of node A, and "root2" is the node ID of node D.

303. The ring network processing module of the source access node A configures the list of terminated ring return packets.

Wherein, the message list of the terminating ring may include a ring ID and a node ID. In this way, according to the label switching path label in the message, by querying the list of the terminating ring returning message, it can be determined whether a loop has been formed currently (that is, whether a loop is returned or not). to the source node).

For example, it can be configured in the termination ring return message list: when the ring ID of the source ring is received as "ring1" and the node ID of the source node is "root1", it is determined to be a loop.

304. The VSI (or VLL) of the source access node A refreshes the MAC address list according to various information in the encapsulated message, such as the MAC address, ring ID, and node ID, and updates all The message is forwarded.

305. When the ring network processing module of the source access node A determines that it needs to be swapped (swap) according to the label switching path label in the encapsulated message, according to the ring label, label switching path label, and pseudowire in the encapsulated message The label queries the preset non-interworking list to determine whether the encapsulated message needs to be forwarded to the next-hop node B, and if the encapsulated message needs to be forwarded to the next-hop node B, step 305 is performed; if not If the encapsulated message needs to be forwarded to the next-hop node B, the operation of forwarding the encapsulated message to the next-hop node B is omitted.

Wherein, the non-interworking list may include ring identifiers and node identifiers, which are used to indicate whether the nodes are interoperable, so that the preset non-interworking list can be queried through the ring label, label switched path label, and pseudowire label in the message. It is determined whether the message needs to be forwarded to the next hop node B.

306. If it is determined that the message needs to be forwarded to the next-hop node B, the ring network processing module of the source access node A sends the encapsulated message to the next-hop node B through the working ring.

307. The ring network processing module of Node B receives the encapsulated packet, determines that the encapsulated packet is a unicast packet, and then determines that swap is required according to the label switching path label in the encapsulated packet, according to Various information in the encapsulated message, such as refreshing the MAC address list according to the MAC address, ring ID, and node ID.

308. The ring network processing module of Node B queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded to the next Jumping node C, if it is necessary to forward the encapsulated message to the next hop node C, then perform step 308; if it is not necessary to forward the encapsulated message to the next hop node C, then omit the packaged message The operation of forwarding the text to the next hop node C.

Wherein, steps 307 and 308 may be executed in no particular order.

It should be noted that at this time, the list of termination ring return packets can also be queried according to the label switched path label in the encapsulated packet to determine whether a loop is formed, because in this embodiment, the ring identifier of the source ring is "ring1" , the node ID of the source node is "root1", therefore, a loop is not formed at this time, therefore, step 307 can be directly executed.

309. If it is determined that the message needs to be forwarded to the next-hop node C, the ring network processing module of the node B sends the encapsulated message to the next-hop node C through the working ring.

310. The ring network processing module of node C receives the encapsulated packet, determines that the encapsulated packet is a unicast packet, and then determines that swap (swap) is required according to the label switching path label in the encapsulated packet, according to Various information in the encapsulated message, such as refreshing the MAC address list according to the MAC address, ring ID, and node ID.

311. The ring network processing module of node C queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the encapsulated message to determine whether the encapsulated message needs to be forwarded to the next Jump node D, if it is necessary to forward the encapsulated message to the next hop node D, then perform step 311; if it is not necessary to forward the encapsulated message to the next hop node D, then omit the packaged message The operation of forwarding the text to the next hop node D.

Wherein, steps 310 and 311 may be executed in no particular order.

It should be noted that at this time, the list of termination ring return packets can also be queried according to the label switched path label in the encapsulated packet to determine whether a loop is formed, because in this embodiment, the ring identifier of the source ring is "ring1" , the node ID of the source node is "root1", therefore, a loop is not formed at this time, therefore, step 307 can be directly executed.

312. If it is determined that the message needs to be forwarded to the next-hop node D, the ring network processing module of the node B sends the encapsulated message to the next-hop node D through the working ring.

313. The ring network processing module of node D receives the encapsulated message, determines that the encapsulated message is a unicast message, and then determines that it is POP according to the label switching path label in the message (that is, determines that node D is the destination node) , the encapsulated packet is sent to the VSI (or VLL) of node D.

It should be noted that, for unknown unicast packets, they are also processed according to multicast, which will not be repeated here.

As can be seen from the above, in this embodiment, the message is received on the working ring of the MPLS-TP ring network, wherein the unicast message is encapsulated by MPLS, and the unicast message includes a ring label, a label switching path label, a pseudowire label and a net The label of the label switched path includes the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label includes the ring ID of the source ring and the node ID of the source node. Then, according to the ring label in the unicast message, the label switched path Labels and pseudowire labels query the preset non-communication list to determine whether the message needs to be forwarded to the next-hop node. If necessary, forward the message to the next-hop node. If not, omit the The operation of forwarding the message to the next hop node; in this scheme, MPLS is used to encapsulate the message, so when the message is transmitted on the ring network, there is no need to refresh the MAC table, so the switching speed can be improved; Moreover, in this scheme, a non-communication list is maintained, and whether nodes can communicate with each other is determined by querying the non-communication list. Therefore, not only the intercommunication and non-communication between nodes can be realized simply and flexibly, but also the improvement of The transmission efficiency is high, and it is also convenient for subsequent maintenance.

Embodiment four,

On the basis of Embodiments 2 and 3, in order to improve the security of data transmission, each node performs link detection and node detection before forwarding the message to the next hop node. If both are normal (that is, there is no fault), The message is directly forwarded to the next-hop node through the working ring, otherwise, if a link failure or node failure is found, protection switching is performed, which will be described in detail below.

(1) Link failure;

Referring to Figure 4a, node A and node B respectively detect that the link between node A and node B fails 1, point A performs protection switching (wrapping switching), and switches the message to the protection ring for transmission until Node B switches from the protection ring back to the working ring to complete the protection switching.

Wherein, the dotted line in Fig. 4a indicates the transmission route of the message, and the protection switching is similar to the common ring switching, and will not be repeated here.

(2) Node failure;

Referring to Figure 4b, an upstream router, such as a Protocol Independent Multicast (PIM, Protocol Independent Multicast) Bidirectional Forwarding Detection (BFD, Bidirectional Forwarding Detection) device or a multicast source detects that node A has failed 2, and the upstream router triggers protection switching and sends the packet Sending through node D, node D detects that node A has failed 2, triggers the protection switchover of the ring network, switches the message from the working ring to the protection ring, and transmits it to node B before switching the message back from the protection ring In the working ring, the protection switching is completed, and after that, the packets continue to be transmitted on the working ring, which will not be repeated here.

Wherein, the dotted line in FIG. 4b represents the transmission route of the message, and the protection switching of the ring network is similar to the common ring switching, and will not be repeated here.

It can be seen that the switching process of node failure and link failure is similar. In addition, it should be noted that the switching process of unicast and multicast is similar, and the switching process of double-point failure and single-point failure is also similar, which will not be repeated here.

It can be seen from the above that this embodiment can also achieve the same beneficial effects as the second and third implementations, and because this embodiment can detect faults on links and nodes when transmitting messages, and perform protection when faults are detected Switching, therefore, can further improve the security of data transmission.

Embodiment five,

In implementations 2, 3 and 4, a single ring is taken as an example for illustration. It should be understood that the above method is also applicable to multiple rings. The following will take a double ring as an example to describe in detail.

As shown in Figure 5, an MPLS-TP ring network can be established based on Ethernet. The MPLS-TP ring network is a double-ring structure, including a core ring (that is, ring 1 (ring1)) and an access ring (that is, ring 2 (ring2)). , the core ring includes the working ring (i.e. the outer ring) and the protection ring (i.e. the inner ring), which are referred to here as the core working ring and the core protection ring. Similarly, the access ring also includes the working ring (i.e. the outer ring) and the protection ring. The ring (that is, the inner ring) is called an access working ring and an access protection ring here. The working ring and the protection ring connect the various nodes in the Ethernet. For the convenience of description, in this embodiment, the MPLS-TP ring network will include node A, node B, node C, node D, and node E Take node F as an example for illustration, wherein, node B is the primary intersecting ring point, and node C is the standby intersecting ring point. Wherein, each node includes a ring network processing module and a VSI (or VLL), wherein each VSI (or VLL) is connected to a working ring, wherein the dotted line in Fig. 5 indicates a transmission route of a message.

Among them, in order to distinguish between different nodes, each root and each node has an identity, for example, the identity of the root is the root ID (root id), the identity of the node is the node ID (leaf id), and, When encapsulating the message on the network side, these identifiers can also be encapsulated in the message, that is, the format of the message on the network side can be shown in Table 2:

Table II

ring label label switched path label Pseudowire tags Payload

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID (dring id) of the destination ring and the node ID (dleaf id) of the destination node, and the pseudowire label can be It includes the ring ID (sring id) of the source ring and the node ID (sleaf id) of the source node.

In addition, each node will be configured with a non-interworking list, where the non-interworking list may include a ring ID (ring id) and a node ID (leaf id), which are used to indicate whether the nodes are interoperable, so that through The ring label, label switched path label, and pseudowire label query the preset non-communication list to determine whether the packet needs to be forwarded to the next-hop node.

In addition to configuring the non-communication list, in order to avoid loopbacks, it is also necessary to configure the list of finalized ringback packets on the primary intersecting ringpoint and standby intersecting ringpoint (that is, node B and node C). ID (ringid) and node ID (leaf id), in this way, according to the label exchange path label in the message, by querying the list of the terminating ring return message, it can be determined whether the current loop has been formed (that is, whether to return to the source node) , in order to make further processing, for example, if it is a loop, then discard the message; if it is not a loop, execute "query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message , to determine whether the message needs to be forwarded to the next hop node", and so on.

Based on the structure of the MPLS-TP ring network shown in FIG. 5 , the following will take multicast as an example to describe its execution process in detail.

Among them, it should be noted that whether the current message is a multicast message can be determined in a variety of ways. For example, a multicast message can use a specific ring ID and node ID. In this way, according to the ring ID and node ID, the Whether the current packet is a multicast packet can be identified, or an additional identifier can be used to indicate whether the current packet is a multicast packet, etc., which will not be repeated here.

The data transmission method under the double-ring structure is similar to the single-ring data transmission method, except that the main intersecting ring point, that is, node B, when sending the message to the next-hop node E located on the access working ring, It is also necessary to refresh the intersection point entry, wherein the intersection point entry can include a ring ID and a node ID, and is mainly used for judging whether to terminate the message when receiving a message with the current node as the source node from other interfaces. text (that is, loopback at this time).

In addition, for the standby intersecting ring point, that is, node C, when the connection relationship between node C and the VSI or VLL of node C changes from blocking to non-blocking, or from non-blocking to blocking, it is necessary to clear the For all table entries, the initial state of the VSI or VLL attached to the access working ring is blocked.

As can be seen from the above, the present embodiment adopts receiving messages on the working ring of the MPLS-TP ring network, wherein, the message includes a ring label, a label switched path label, a pseudowire label and a payload, and the label switched path label includes The ring ID of the destination ring and the node ID of the destination node, the pseudowire label includes the ring ID of the source ring and the node ID of the source node, and then query the preset to determine whether the message needs to be forwarded to the next hop node, if necessary, forward the message to the next hop node, if not, omit forwarding the message to the next hop The operation of the node; because in this scheme, MPLS is used to encapsulate the message, so when the message is transmitted on the ring network, there is no need to refresh the MAC table, so the switching speed can be improved; and, because in this scheme, A non-intercommunication list is maintained, and it is determined whether nodes can communicate with each other by querying the non-intercommunication list. Therefore, it is not only simple and flexible to realize intercommunication and non-intercommunication between nodes, improve transmission efficiency, but also facilitate follow-up maintenance.

Embodiment six,

On the basis of Embodiment 5, in order to improve the security of data transmission, each node performs link detection and node detection before forwarding the message to the next hop node. The message is forwarded to the next hop node through the working ring, otherwise, if a link failure or node failure is found, protection switching is performed.

Among them, the single-point fault (except the main intersecting ring point) is handled in the same way as in the fourth implementation, and will not be repeated here, and the multi-point fault and the main intersecting ring point will be described in detail below.

Referring to Figure 6a, fault 1 occurs between node A and primary intersecting ring point B, and fault 2 also occurs between primary intersecting ring point B and backup intersecting ring point C. The ring and the main intersecting point are still communicating, so the standby intersecting ring point C does not perform any processing for accessing the working ring, and cannot implement the protection switching of the dotted line 1. Under such fault conditions, the service of the downlink access ring is interrupted , that is, the unicast traffic from nodes A, C, and D to nodes B, C, E, and F is blocked. Therefore, at this time, the primary intersecting ring point B can notify the standby intersecting ring point C to attach the blocking point, that is, connect the blocking point, so that the message can be transmitted to the access ring through the standby intersecting ring point C. For example, the details can be as follows:

The message is sent from the multicast source to node A. Node A detects that the link between node A and the main intersecting ring point B has failed, so it triggers protection switching, and switches the message from the core working ring to the core through the protection bridge. In the protection ring, because the link between primary intersecting ring point B and standby intersecting ring point C also fails, the message will be transmitted along the core protection ring to standby intersecting ring point C, and then the report will be sent through the protection bridge. The message is switched back to the core working ring, and then the message is transmitted according to the normal link transmission mode. In addition, the primary intersecting ring point B also perceives the link between itself (that is, the primary intersecting ring point B) and node A, and the link between itself (the primary intersecting ring point B) and the backup intersecting ring point C. Therefore, the primary intersecting ring point B notifies the standby intersecting ring point C to mount the blocking point, that is, the blocking point is connected, so that the packet can be transmitted to the access working ring through the standby intersecting ring point C, because the primary intersecting ring point C The link between ring point B and backup intersecting ring point C is unreachable. Therefore, when packets enter the access working ring through backup intersecting ring point C, the packets will be switched to the access protection ring through the protection bridge. When it is transmitted to the main intersecting ring point B, the message is switched back to the access working ring through the protection bridge, and then the message is transmitted according to the normal link transmission mode, which will not be repeated here.

Referring to Fig. 6b, since fault 1 occurs on the primary intersecting ring point B, at this time, the backup intersecting ring point C can detect that there is no intercommunication between the access working ring and the main intersecting point, so the backup intersecting ring point C is blocked Point, that is, to connect the blocking point, so that the message can be sent to the access ring through the backup intersecting ring point C. For example, the details can be as follows:

The message is sent from the multicast source to node A. Node A detects that the main intersecting ring point B is faulty, so it triggers protection switching. The message is switched from the core working ring to the core protection ring through the protection bridge, and is transmitted to the standby ring. When intersecting ring point C, the message is switched back to the core working ring through the protection bridge, and then the message is transmitted according to the normal link transmission mode. In addition, the standby intersecting ring point C also detects that the primary intersecting ring point B is faulty. Therefore, the standby intersecting ring point C is connected to the blocking point, that is, the blocking point is connected, so that the message can be transmitted through the standby intersecting ring point C. On the access working ring, because the primary intersecting ring point B fails, when the packet enters the access working ring through the backup intersecting ring point C, the packet will be switched to the access protection ring through the protection bridge. When it is transmitted to the main intersecting ring point E, the message is switched back to the access working ring through the protection bridge, and then the message is transmitted according to the normal link transmission mode, which will not be repeated here.

It can be seen from the above that this embodiment can also achieve the same beneficial effect as that of Embodiment 5. Moreover, since this embodiment can perform fault detection on links and nodes when transmitting messages, and perform protection switching when a fault is detected, Therefore, the security of data transmission can be further improved.

Embodiment seven,

In order to better implement the above method, an embodiment of the present invention also provides a data transmission device in a ring network. As shown in FIG. 7, the data transmission device includes a receiving unit 701, a query unit 702, a sending unit 703 and a blocking unit;

The receiving unit 701 is configured to receive messages on the working ring of the MPLS-TP ring network.

Wherein, the message may be a multicast message or a unicast message, and the message is encapsulated by MPLS, and the message may include a ring label (ring label), a label switched path label (lsp label), a fake Wire label (pwlabel) and payload, that is, the format of the packet is "ring label + label switching path label + pseudowire label + payload".

Among them, the format of the label switched path label can adopt the format of the existing label switched path label, but its content can include the ring ID (dring id) of the destination ring and the node ID (dleaf id) of the destination node, and the pseudowire label can be It includes the ring ID (sring id) of the source ring and the node ID (sleaf id) of the source node.

The query unit 702 is configured to query a preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message, so as to determine whether the message needs to be forwarded to the next-hop node.

Wherein, the non-interworking list may include a ring ID (ring id) and a node ID (leaf id), which are used to indicate whether the nodes are interoperable, so that the pre-checked information can be queried through the ring label, label switching path label, and pseudowire label in the message. It can be determined whether the message needs to be forwarded to the next-hop node through the configured non-interworking list.

The sending unit 703 is configured to forward the message to the next-hop node when the query unit 702 determines that the message needs to be forwarded to the next-hop node;

The blocking unit 704 is configured to omit the operation of forwarding the message to the next-hop node when the query unit determines that the message does not need to be forwarded to the next-hop node.

Among them, before the query unit 702 queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node, it can also determine the current Whether a loop has been formed, if it is not a loop, query the preset non-communication list according to the ring label, label switching path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node , if a loop has been formed, the message can be discarded, that is, the data transmission device in the ring network can also include a determination unit;

The determining unit is used to query the list of termination ring return messages according to the label switching path label in the message, so as to determine whether it is a loop, and if it is a loop, then discard the message; if it is not a loop, trigger the query unit to execute According to the ring label, label switched path label, and pseudowire label in the message, query the preset non-interworking list to determine whether the message needs to be forwarded to the next-hop node.

In addition, after each node receives the message, it can further process the message according to the different transmission methods of the message. For example, for multicast, it can also copy a message and send it to to the VSI or VLL of the current node, so that the VSI or VLL can refresh the MAC address list according to the copied message, and forward the message inside the VSI or VLL; When the label switching path label in the message determines that it needs to be swapped (swap), it will be exchanged directly on the ring (that is, ring swap), and if it is determined to be POP according to the label switching path label in the message, it will enter VSI or VLL , and perform VSI or VLL internal forwarding behavior; that is:

The sending unit 703 can also be used to determine that the message is a multicast message, copy the message, and send the copied message to the VSI or VLL of the current node, so that the VSI or VLL can refresh the MAC according to the copied message address list, and forward the message within the VSI or VLL.

The sending unit 703 can also be used to determine that the message is a unicast message; when it is determined that switching is required according to the label switched path label in the message, trigger the query unit 702 to perform 1. The pseudowire label queries the preset non-interworking list to determine whether the message needs to be forwarded to the next hop node; when it is determined to be POP according to the label switching path label in the message, the The message is sent to the VSI or VLL of the current node, so that the VSI or VLL refreshes the MAC address list according to the message, and forwards the message inside the VSI or VLL.

It should be noted that, for unknown unicast packets, they are also processed according to multicast, which will not be repeated here.

Among them, when forwarding the message to the next hop node, link detection and node detection can be carried out. If both are normal (that is, there is no fault), the message is directly forwarded to the next hop node through the working ring, otherwise , if a link failure or node failure is found, protection switching is performed, that is, the sending unit 703 can be specifically used for:

Detect the link and the next hop node of the working ring of the MPLS-TP ring network,

If a link failure is detected, protection switching is performed, and the message is sent to the next hop node through the protection ring (ie inner ring) of the MPLS-TP ring network;

If the failure of the next hop node is detected, protection switching will be performed, and the message will be sent to the next hop node through the protection ring (that is, the inner ring) of the MPLS-TP ring network by using the path that bypasses the faulty node;

If neither link failure nor next-hop node failure is detected, the message is forwarded to the next-hop node through the working ring of the MPLS-TP ring network.

In addition, it should be noted that the MPLS-TP ring network may be a single ring or multiple rings such as double rings. Wherein, the dual ring may include a core working ring and an access working ring, wherein the core working ring and the access working ring may include two intersecting ring points, one is a primary intersecting ring point, and the other is a standby intersecting ring point, wherein, for For the VSI or VLL of the two nodes, the primary intersecting ring point and the standby intersecting ring point, they need to be mounted on the core working ring and the access working ring respectively. However, for the standby intersecting ring point , the initial state of the VSI or VLL connected to the working ring is blocked. Only when the primary intersecting ring notifies the standby intersecting ring to attach the blocking point, or when the standby intersecting ring detects that the primary intersecting ring is faulty, the standby intersecting ring The loop point will connect (that is, mount) the choke point.

If the working ring of the MPLS-TP ring network includes a core working ring and an access working ring, then the data transmission device in the ring network may also include a refreshing unit, specifically for:

If the current node is located on the core working ring and is the main intersecting ring point, when the message is sent to the next hop node located on the access working ring, the intersecting point entry is refreshed;

If the current node is located on the core working ring and is a standby intersecting ring point, when the connection relationship between the current node and the virtual forwarding instance/virtual leased line of the current node changes from blocking to non-blocking, or from non-blocking to When it is blocked, all entries on the current node are cleared, and the initial state of the virtual forwarding instance/virtual leased line attached to the access working ring is blocked.

At this time, the sending unit 703 can also be specifically configured to: if the next-hop node is located on the core working ring and is the main intersecting ring point, then when it is determined that multiple links related to the next-hop node fail (i.e. When a multi-point failure occurs), or when it is determined that the next hop node fails, the message is transmitted to the access working ring by using the backup intersecting ring point through the protection ring of the MPLS-TP ring network. The details can be as follows:

When it is determined that multiple links related to the next hop node fail, the next hop node notifies the standby intersecting ring point to connect to the blocking point of the working ring, so as to pass through the protection ring of the MPLS-TP ring network , using the backup intersecting ring point to transmit the message to the access working ring.

When it is determined that the next hop node fails, the standby intersecting ring point senses the failure of the primary intersecting ring point and connects to the blocking point of the working ring, so as to use the backup intersecting ring point through the protection ring of the MPLS-TP ring network The message is transmitted to the access working ring.

Specifically, the data transmission device in the ring network can be integrated in routers, and these routers can be used as nodes in the MPLS-TP ring network.

In specific implementation, each of the above units may be implemented as an independent entity, or may be combined arbitrarily as the same or several entities. The specific implementation of each of the above units may refer to the previous embodiments, and will not be repeated here.

As can be seen from the above, the receiving unit 701 of the data transmission device in the ring network of this embodiment can receive a message on the working ring of the MPLS-TP ring network, wherein the message is encapsulated by MPLS, and the message can include ring label, label switching path label, pseudowire label and payload, and the label switching path label includes the ring identifier of the destination ring and the node identifier of the destination node, and the pseudowire label includes the ring identifier of the source ring and the node identifier of the source node, and then, The query unit 702 queries the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next hop node, and if necessary, the sending Unit 703 forwards the message to the next hop node, if not needed, then the operation of forwarding the message to the next hop node is omitted by the blocking unit 704; Encapsulation, so when the message is transmitted on the ring network, there is no need to refresh the MAC table, so the switching speed can be improved; moreover, because in this scheme, a non-interworking list is maintained, and the node is determined by querying the non-interworking list Therefore, not only can the intercommunication and non-intercommunication between nodes be realized simply and flexibly, the transmission efficiency can be improved, but also the subsequent maintenance is convenient.

Embodiment eight,

Correspondingly, the embodiment of the present invention also provides a communication system, including any data transmission device in the ring network provided by the embodiment of the present invention. For the data transmission device in the ring network, please refer to Embodiment 7 for details, and it will not be described here. Let me repeat.

Since the communication system includes any data transmission device in the ring network provided by the embodiment of the present invention, it can also achieve the same beneficial effects as the data transmission device in any ring network provided by the embodiment of the present invention. See the previous embodiments, and details will not be repeated here.

Embodiment nine,

Correspondingly, the embodiment of the present invention also provides a network device, including a processor, a memory for storing data, and a transceiver device for sending and receiving data, as follows:

The processor is used to receive the message on the working ring of the MPLS-TP ring network, wherein, the message includes the ring label, the label switching path label, the pseudowire label and the payload, and the label switching path label includes the ring label of the destination ring ID and the node ID of the destination node, the pseudowire label includes the ring ID of the source ring and the node ID of the source node; according to the ring label, label switching path label, and pseudowire label in the message, query the preset non-communication list, and use Determine whether the message needs to be forwarded to the next-hop node; if yes, forward the message to the next-hop node; if not, omit the operation of forwarding the message to the next-hop node.

Among them, before querying the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node, it can also be determined whether a ring is currently formed If it is not a loop, then query the preset non-communication list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the message needs to be forwarded to the next-hop node. If there is a loop, the message can be discarded, that is:

The processor is also used to query the list of terminated loop return packets according to the label switching path label in the packet to determine whether it is a loop; if it is a loop, discard the packet; if it is not a loop, execute according to the The ring label, label switched path label, and pseudowire label in the message query a preset non-interworking list to determine whether the message needs to be forwarded to a next-hop node.

In addition, after each node receives the message, it can further process the message according to the different transmission methods of the message. For example, for multicast, it can also copy a message and send it to to the VSI or VLL of the current node, so that the VSI or VLL can refresh the MAC address list according to the copied message, and forward the message inside the VSI or VLL; When the label switching path label in the message determines that it needs to be swapped (swap), it is directly exchanged on the ring (that is, ring swap), and if it is determined to be popped (POP) according to the label switching path label in the message, then Enter the VSI or VLL, and perform the internal forwarding behavior of the VSI or VLL; that is, query the preset non-interworking list according to the ring label, label switched path label, and pseudowire label in the message to determine whether the Before the message is forwarded to the next hop node", the processor is also used to perform the following operations:

(1) Multicast;

Determine that the message is a multicast message, copy the message (that is, a multicast message), and send the copied message to the VSI or VLL of the current node, so that the VSI or VLL can refresh the MAC address according to the copied message list, and forward the message inside the VSI or VLL.

(2) Unicast;

It is determined that the packet is a unicast packet, and when it is determined that swap is required according to the label switching path label in the packet, execute "query the preset non-interworking list to determine whether the message needs to be forwarded to the next hop node” step; when the label switching path label in the message is determined to be POP, the message is sent to the VSI or VLL of the current node, So that the VSI or VLL refreshes the MAC address list according to the message, and forwards the message inside the VSI or VLL.

It should be noted that, for unknown unicast packets, they are also processed according to multicast, which will not be repeated here.

Among them, when the processor forwards the message to the next hop node, it can perform link detection and node detection. If both are normal (that is, there is no fault), the message is directly forwarded to the next hop node through the working ring , otherwise, if a link failure or node failure is found, protection switching is performed, namely:

The processor is specifically used to detect the link and the next hop node of the working ring of the MPLS-TP ring network; if a link failure is detected, then protection switching is performed, and the protection ring of the MPLS-TP ring network will The message is sent to the next hop node; if a failure of the next hop node is detected, protection switching is performed, and the message is sent to the next hop node through the protection ring of the MPLS-TP ring network by using a path bypassing the faulty node. The next hop node of the first hop node; if neither the link failure nor the next hop node failure is detected, the message is forwarded to the next hop node through the working ring of the MPLS-TP ring network.

In addition, it should be noted that the MPLS-TP ring network may be a single ring or multiple rings such as double rings. Wherein, the dual ring may include a core working ring and an access working ring, wherein the core working ring and the access working ring may include two intersecting ring points, one is a primary intersecting ring point, and the other is a standby intersecting ring point, wherein, for For the VSI or VLL of the two nodes, the primary intersecting ring point and the standby intersecting ring point, they need to be mounted on the core working ring and the access working ring respectively. However, for the standby intersecting ring point In other words, the initial state of its VSI or VLL connected to the working ring is blocked. Only when the master intersecting ring notifies the standby intersecting ring to attach the blocking point, or when the standby intersecting ring detects that the main intersecting ring fails, the backup Intersecting ring points will connect (that is, hook up) the choke point.

If the working ring of the MPLS-TP ring network includes a core working ring and an access working ring, the processor can specifically be used to: if the next-hop node is located on the core working ring and is the main intersecting ring point, then determine When multiple links related to the next-hop node fail (that is, a multi-point failure occurs), or when it is determined that the next-hop node fails, use the backup intersecting link through the protection ring of the MPLS-TP ring network The ring point transmits the message to the access working ring; the details can be as follows:

When it is determined that multiple links related to the next hop node fail, the next hop node notifies the standby intersecting ring point to connect to the blocking point of the working ring, so as to pass through the protection ring of the MPLS-TP ring network , using the backup intersecting ring point to transmit the message to the access working ring.

When it is determined that the next hop node fails, the standby intersecting ring point senses the failure of the primary intersecting ring point and connects to the blocking point of the working ring, so as to use the backup intersecting ring point through the protection ring of the MPLS-TP ring network The message is transmitted to the access working ring.

In addition, depending on the position of the current node, the subsequent processing it needs to perform will also be different. For example, the processor can also be used to perform the following operations:

If the current node is on the core working ring and is the main intersecting ring point, when sending the message to the next-hop node on the access working ring, it is also necessary to refresh the intersection point entry, where the intersection point The entry may include a ring identifier and a node identifier, and is mainly used for judging whether to terminate the packet (that is, loopback at this time) when a packet with the current node as the source node is received from another interface.

And if the current node is located on the core working ring and is a standby intersecting ring point, then when the connection relationship between the current node and the VSI or VLL of the current node changes from blocking to non-blocking, or from non-blocking to blocking, It is also necessary to clear all entries on the current node, where the initial state of the VSI or VLL attached to the access working ring is blocked.

For the specific implementation of each of the above devices, reference may be made to the foregoing embodiments, and details are not repeated here.

As can be seen from the above, the network device in this embodiment receives messages on the working ring of the MPLS-TP ring network, wherein the messages are encapsulated using MPLS, and the messages include ring labels, label switching path labels, and pseudowire labels. and payload, while the label switched path label includes the ring ID of the destination ring and the node ID of the destination node, and the pseudowire label includes the ring ID of the source ring and the node ID of the source node. Then, according to the ring label, label Switch the path label and pseudowire label to query the preset non-communication list to determine whether the message needs to be forwarded to the next-hop node, if necessary, forward the message to the next-hop node, if not, then Omit the operation of forwarding the message to the next hop node; because in this scheme, MPLS is used to encapsulate the message, so when the message is transmitted on the ring network, there is no need to refresh the MAC table, so the switching speed can be improved. speed; moreover, since in this scheme, a non-communication list is maintained, and whether nodes can communicate with each other is determined by querying the non-communication list, therefore, not only the intercommunication and non-communication between nodes can be realized simply and flexibly , improve transmission efficiency, and also facilitate subsequent maintenance.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: Read Only Memory (ROM, Read Only Memory), Random Access Memory (RAM, Random Access Memory), disk or CD, etc.

The data transmission method, device and system in a ring network provided by the embodiments of the present invention are described above in detail. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only It is used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, this specification The content should not be construed as a limitation of the invention.

Claims (19)

1. the data transmission method in a kind of looped network, it is characterised in that including：

Message is received on the building ring of the transmission subset MPLS-TP looped networks of multiprotocol label switching, the message includes ring Label, label switched path label, pseudo line tag and payload, the ring mark of the label switched path label including purpose ring and The node identification of destination node, the pseudo line tag includes the ring mark of source ring and the node identification of source node；

Ring label, label switched path label, pseudo line tag in the message inquire about preset not intercommunication list, with true It is fixed whether to need for the message to be transmitted to next-hop node；The not intercommunication list be used to indicate between node whether intercommunication；

If it is determined that the message is transmitted to next-hop node by needs, then the message is transmitted to next-hop node；

If it is determined that the message need not be transmitted into next-hop node, then omit and the message is transmitted to next-hop node Operation.

2. method according to claim 1, it is characterised in that ring label, the Tag switching in the message Path label, pseudo line tag inquire about preset not intercommunication list, to determine whether the message needs to be transmitted to next-hop node Before, methods described also includes：

Label switched path tag queries termination loopback message list in the message, to determine whether being loop；

If it is determined that being loop, then dropping packets；

If it is determined that not being loop, then triggering performs ring label, label switched path label, the pseudo-wire in the message The preset not intercommunication list of tag queries, to determine whether the message needs to be transmitted to the operation of next-hop node.

3. method according to claim 2, it is characterised in that ring label, the Tag switching in the message Path label, pseudo line tag inquire about preset not intercommunication list, to determine the need for for the message being transmitted to next-hop section Before point, methods described also includes：

Determine that the message is multicast message；

The message is replicated, and the message of duplication is sent to the Virtual Switch Instance or virtual leased line of present node.

4. method according to claim 2, it is characterised in that ring label, the Tag switching in the message Path label, pseudo line tag inquire about preset not intercommunication list, to determine the need for for the message being transmitted to next-hop section Before point, methods described also includes：

Determine that the message is unicast message；

When label switched path label in the message determines to need to exchange, triggering performs the ring in the message Label, label switched path label, pseudo line tag inquire about preset not intercommunication list, to determine the need for turning the message Issue the operation of next-hop node；

When label switched path label in the message is defined as bullet and falls POP, the message is sent to present node Virtual Switch Instance or virtual leased line.

5. the method according to any one of Claims 1-4, it is characterised in that described that the message is transmitted to next-hop Node, including：

Link and next-hop node to the building ring of the MPLS-TP looped networks are detected；

If detecting link failure, pretection switch is carried out, be sent to down the message by the protection ring of MPLS-TP looped networks One hop node；

If detecting next-hop node failure, pretection switch is carried out, it is former using bypassing by the protection ring of MPLS-TP looped networks The message is sent to the next-hop node of next-hop node in the path for hindering node；

If both not detected link failure or not detected next-hop node failure, by the work of MPLS-TP looped networks The message is transmitted to next-hop node by ring.

6. the method according to any one of Claims 1-4, it is characterised in that if the building ring bag of the MPLS-TP looped networks Include core work ring and cut-in operation ring, then it is described that the message is transmitted to next-hop node, including：

If next-hop node be located at core work ring on, and based on intersect circling point, then it is determined that related to the next-hop node Multilink when breaking down, or when it is determined that the next-hop node breaks down, by the protection of MPLS-TP looped networks Ring, using standby intersecting circling point by the message transmissions to cut-in operation ring.

7. method according to claim 6, it is characterised in that it is determined that the multilink related to the next-hop node When breaking down, by the protection ring of MPLS-TP looped networks, using the standby circling point that intersects by the message transmissions to cut-in operation In ring, including：

When it is determined that the multilink related to the next-hop node breaks down, notify standby intersecting by the next-hop node Circling point mounts the choke point of cut-in operation ring, will pass through the protection ring of MPLS-TP looped networks, using the standby circling point that intersects by institute Message transmissions are stated in cut-in operation ring.

8. method according to claim 6, it is characterised in that when it is determined that the next-hop node breaks down, pass through The protection ring of MPLS-TP looped networks, using the standby intersecting circling point by the message transmissions to cut-in operation ring, including：

When it is determined that the next-hop node breaks down, perceived main intersecting circling point failure and mounted access work by standby intersecting circling point Make the choke point of ring, will pass through the protection ring of MPLS-TP looped networks, using the standby intersecting circling point by the message transmissions to connecing In entering building ring.

9. the method according to any one of Claims 1-4, it is characterised in that if the building ring bag of the MPLS-TP looped networks Core work ring and cut-in operation ring are included, then：

If present node be located at core work ring on, and based on intersect circling point, then by the message be sent to positioned at access work When making the next-hop node on ring, refresh joining list item；

If present node is located on core work ring, and is standby intersecting circling point, then when the present node and the present node The annexation of Virtual Switch Instance/virtual leased line be changed into not blocking from blocking, or when being changed into obstruction from not blocking, remove All list items on the present node, the Virtual Switch Instance/virtual leased line is articulated to the initial shape of cut-in operation ring State is obstruction.

10. the data transmission device in a kind of looped network, it is characterised in that including：

Receiving unit, it is described for receiving message on the building ring of the transmission subset MPLS-TP looped networks of multiprotocol label switching Message includes ring label, label switched path label, pseudo line tag and payload, and the label switched path label includes purpose The ring mark and the node identification of destination node of ring, the pseudo line tag include the ring mark of source ring and the node mark of source node Know；

Query unit, it is preset not for the ring label in the message, label switched path label, pseudo line tag inquiry Intercommunication list, to determine the need for for the message being transmitted to next-hop node；The not intercommunication list be used for indicate node it Between whether intercommunication；

Transmitting element, for when the query unit determines to need for the message to be transmitted to next-hop node, by the report Text is transmitted to next-hop node；

Blocking unit, for being omitted institute when the query unit determines the message need not be transmitted into next-hop node State the operation that message is transmitted to next-hop node.

Data transmission device in 11. looped networks according to claim 10, it is characterised in that also including determining unit；

The determining unit, in the message label switched path tag queries terminate loopback message list, with Determine whether to be loop, if loop, then dropping packets；If not during loop, then triggering query unit and performing according to the report Whether ring label, label switched path label, pseudo line tag in text inquire about preset not intercommunication list, to determine the message Need to be transmitted to the operation of next-hop node.

Data transmission device in 12. looped networks according to claim 11, it is characterised in that

The transmitting element, is additionally operable to determine the message for multicast message, replicates the message, and the message that will be replicated sends To the Virtual Switch Instance or virtual leased line of present node.

Data transmission device in 13. looped networks according to claim 11, it is characterised in that

The transmitting element, is additionally operable to determine that the message is unicast message；Label switched path mark in the message When signing determination and needing to exchange, trigger ring label, label switched path label that the query unit performed in the message, Pseudo line tag inquires about preset not intercommunication list, to determine the need for being transmitted to the message operation of next-hop node； When label switched path label in the message is defined as bullet and falls POP, the message is sent to the void of present node Intend forwarding instance or virtual leased line.

Data transmission device in 14. looped network according to any one of claim 10 to 13, it is characterised in that the transmission Unit, specifically for：

Link and next-hop node to the building ring of the MPLS-TP looped networks are detected；

If detecting link failure, pretection switch is carried out, be sent to down the message by the protection ring of MPLS-TP looped networks One hop node；If detecting next-hop node failure, carry out pretection switch, by the protection ring of MPLS-TP looped networks, using around The message is sent to the next-hop node of next-hop node in the path for crossing malfunctioning node；

If both not detected link failure or not detected next-hop node failure, by the work of MPLS-TP looped networks The message is transmitted to next-hop node by ring.

Data transmission device in 15. looped network according to any one of claim 10 to 13, it is characterised in that if described The building ring of MPLS-TP looped networks includes core work ring and cut-in operation ring, then the transmitting element, specifically for：

If next-hop node be located at core work ring on, and based on intersect circling point, then it is determined that related to the next-hop node Multilink when breaking down, or when it is determined that the next-hop node breaks down, by the protection of MPLS-TP looped networks Ring, using standby intersecting circling point by the message transmissions to cut-in operation ring.

Data transmission device in 16. looped networks according to claim 15, it is characterised in that the transmitting element, specifically For：

If next-hop node be located at core work ring on, and based on intersect circling point, then it is determined that related to the next-hop node Multilink when breaking down, notify that standby intersecting circling point mounts the choke point of cut-in operation ring by the next-hop node, with The protection ring of MPLS-TP looped networks is will pass through, using the standby intersecting circling point by the message transmissions to cut-in operation ring.

Data transmission device in 17. looped networks according to claim 15, it is characterised in that the transmitting element, specifically For：

If next-hop node be located at core work ring on, and based on intersect circling point, then it is determined that the next-hop node occur therefore During barrier, perceived main intersecting circling point failure and mounted the choke point of cut-in operation ring by standby intersecting circling point, will pass through MPLS-TP rings The protection ring of net, using the standby intersecting circling point by the message transmissions to cut-in operation ring.

Data transmission device in 18. looped network according to any one of claim 10 to 13, it is characterised in that if described The building ring of MPLS-TP looped networks includes core work ring and cut-in operation ring, then the data transmission device in the looped network is also wrapped Refresh unit is included, specifically for：

If present node be located at core work ring on, and based on intersect circling point, then the message is sent to positioned at cut-in operation During next-hop node on ring, refresh joining list item；

If present node is located on core work ring, and is standby intersecting circling point, then when the present node and the present node The annexation of Virtual Switch Instance/virtual leased line be changed into not blocking from blocking, or when being changed into obstruction from not blocking, remove All list items on the present node, the Virtual Switch Instance/virtual leased line is articulated to the initial shape of cut-in operation ring State is obstruction.

19. a kind of communication systems, it is characterised in that including at least two data transmission devices, at least two data transfer Each device in device is the data transmission device as described in claim 10 to 18 is any.