CN106330695B - Service control method and device - Google Patents
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
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Abstract
The invention discloses a service control method and a device, wherein a service control module receives a service establishment request through a first interface; sending a path calculation request to a path calculation module according to the service attribute and the service state; the path calculation module calculates a service path or a service recovery path; the service control module sends the calculated service path or service restoration path to a first node of the service path through a second interface, and sends a service path establishment request to the first node so that the first node establishes the service path or restores the service path through RSVP; and when the service path is successfully established or recovered, the path management module updates the stored actual service path.
Description
Technical Field
The present invention relates to the field of transport network communications, and in particular, to a method and an apparatus for controlling a service under a stateful Path Computation Element (PCE).
Background
The control plane technology of the transport communication Network is gradually developing from distributed control based on the Multi-Protocol Label Switching Traffic engineering technology (MPLS-TE) and the Generalized Multi-Protocol Label Switching (GMPLS) to the centralized intelligent control technology of the Software Defined Network (SDN).
In the above control manner, the key technology still focuses on path calculation and service management. In the aspect of path computation, the PCE is introduced as a separate functional entity, and is specially used for increasingly complex traffic path computation. In terms of service management, the conventional related technologies and standards based on MPLS-TE and GMPLS are well developed, and they mainly use Resource Reservation Protocol (RSVP) to establish a Label Switched Path (LSP). The method for managing the services by using the LSP has the problems that each service is managed by a first node of a transmission network, distributed control is performed, and problems that global services cannot be optimized and control conflicts are caused are solved, so that a concept of centralized control of the SDN is gradually proposed.
With the introduction of the stateful PCE technology, the PCE can acquire services established by all control planes, master the whole LSP, and propose that the draft-ietf-pc-initiated-LSP draft initiates establishment of the LSP from the PCE, but only simply trigger service establishment, and do not relate to recovery and protection frequently used in a transmission network and service control of a multi-layer network.
Disclosure of Invention
In order to solve the above technical problem, embodiments of the present invention provide a service control method and apparatus.
The service control method provided by the embodiment of the invention comprises the following steps:
receiving a service establishing request, and calculating a service path or a service recovery path according to the service attribute and the service state;
according to the service path or the service restoration path obtained by calculation, sending a service path establishment request to a first node of the service path so that the first node establishes the service path or restores the service path through RSVP;
and when the establishment or recovery of the service path is successful, updating the stored actual service path.
In the embodiment of the present invention, the calculating a service path or a service restoration path according to the service attribute and the service state includes:
when the service state is the service establishment, directly calculating a service path;
when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
wherein, the request content in the service establishment request includes: the method comprises the following steps that (1) the head and tail access point information, the service grade information, the service flow parameter, the signal type, the recovery attribute and the protection attribute of a service in a transmission network are obtained; the service attributes include: and receiving request content and an associated path in the service establishment request.
In the embodiment of the present invention, the method further includes:
and when the fault monitoring point detects a fault, receiving information which indicates that the service state is a service fault and sent by the first node, and updating the service state.
In the embodiment of the invention, the service path establishing request carries a recovery attribute, and the recovery attribute indicates whether the established service path has recovery capability or not;
the method further comprises the following steps: and when a service path establishment request is sent to the first node of the service path, the calculated service path and the preset path are also sent to the first node of the service path.
In the embodiment of the present invention, the method further includes:
when a preset path exists, recovering the service by using the preset path after the service fails; and when the preset path does not exist, recalculating the service path after reporting the fault information, and restarting a service path establishment request, wherein the original path is taken as an associated path to be avoided during path calculation.
In the embodiment of the present invention, the service path establishment request carries a protection attribute, where the protection attribute indicates whether the established service path is in a working state or a protection state, and indicates a protection mode when the established service path is in the protection state;
the sending a service path establishment request to a head node of a service path includes:
and sending the plurality of calculated service paths and the protection attributes to a first node of the service path.
In the embodiment of the invention, the service path establishing request carries an extended link attribute which indicates that the established service path forms a link;
the sending a service path establishment request to a head node of a service path includes:
and sending the extended link attribute to a head node of the service path.
The service control device provided by the embodiment of the invention comprises:
the service control module is used for receiving a service establishment request through a first interface; sending a path calculation request to a path calculation module according to the service attribute and the service state;
the path calculation module is used for calculating a service path or a service recovery path;
the service control module is further configured to send the calculated service path or service restoration path to a first node of the service path through a second interface, and send a service path establishment request to the first node, so that the first node establishes the service path or restores the service path through RSVP;
and the path management module is used for updating the stored actual service path after the service path is successfully established or recovered.
In the embodiment of the present invention, the apparatus further includes: the service state management module is used for storing the service state of the service path;
the path calculation module is further configured to directly calculate a service path when the service state is service establishment; when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
wherein, the request content in the service establishment request includes: the method comprises the following steps that (1) the head and tail access point information, the service grade information, the service flow parameter, the signal type, the recovery attribute and the protection attribute of a service in a transmission network are obtained; the service attributes include: and receiving request content and an associated path in the service establishment request.
In the embodiment of the present invention, the service state management module is further configured to receive, when a fault is detected by the fault monitoring point, information indicating that the service state is a service fault, sent by the head node, and update the service state.
In the embodiment of the invention, the service path establishing request carries a recovery attribute, and the recovery attribute indicates whether the established service path has recovery capability or not;
and the service control module is further configured to send the restoration attribute to a head node of the service path.
In the embodiment of the present invention, the service control module is further configured to, when a preset path exists, recover a service using the preset path after the service fails; and when the preset path does not exist, reporting the fault information, then recalculating the service path by the path calculation module, and restarting a service path establishment request, wherein the original path is taken as an associated path to be avoided during path calculation.
In the embodiment of the present invention, the service path establishment request carries a protection attribute, where the protection attribute indicates whether the established service path is in a working state or a protection state, and indicates a protection mode when the established service path is in the protection state;
and the service control module is also used for sending the calculated multiple service paths and the protection attributes to the first node of the service path.
In the embodiment of the invention, the service path establishing request carries an extended link attribute which indicates that the established service path forms a link;
and the service control module is further configured to send the extended link attribute to a head node of the service path.
In the technical scheme of the embodiment of the invention, a service control device is introduced into a stateful PCE, and the device realizes receiving a service establishment request and calculates a service path or a service recovery path according to service attributes and a service state; according to the service path or the service restoration path obtained by calculation, sending a service path establishment request to a first node of the service path so that the first node establishes the service path or restores the service path through RSVP; and when the establishment or recovery of the service path is successful, updating the stored actual service path. The device realizes centralized control service on the stateful PCE, triggers the transmission node to establish the related service according to the mode of MPLS-TE or GMPLS, realizes intelligent control centralization on the basis of utilizing the mature service establishment mode of MPLS-TE and GMPLS, and realizes recovery, protection and service control of a multilayer network.
Drawings
Fig. 1 is a flow chart illustrating a service control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a service control apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of establishing a service of a two-layer transmission network according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
Fig. 1 is a schematic flow chart of a service control method according to an embodiment of the present invention, where the service control method in this example is applied to a service control device, and as shown in fig. 1, the service control method includes the following steps:
step 101: and receiving a service establishing request, and calculating a service path or a service recovery path according to the service attribute and the service state.
In the embodiment of the present invention, the request content in the received service establishment request includes, but is not limited to: the method comprises the steps of accessing point information of the service from head to tail in a transmission network, service grade information, service flow parameters, signal types, recovery attributes and protection attributes.
Here, there are various ways of receiving the service establishment request: the service establishment request can be issued to the service control device by the user through the network management, or forwarded to the service control device after being received by the transmission node, or sent to the service control device by the SDN application, or sent to the service control device by other network related entities.
In the embodiment of the present invention, the service attribute includes: and receiving request content and an associated path in the service establishment request.
In the embodiment of the invention, the service state comprises an establishment state, a fault state and the like.
In the embodiment of the invention, when the service state is the service establishment, the service path is directly calculated;
when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
step 102: and sending a service path establishment request to a first node of the service path according to the service path or the service restoration path obtained by calculation so that the first node establishes the service path or restores the service path through a resource reservation protocol RSVP.
In the embodiment of the present invention, the service Path establishment request is specifically a trigger LSP establishment message, and the message is sent through a Path Computation Element Protocol (PCEP).
In the embodiment of the invention, the service path establishing request is extended with one or more of the following attributes: recovery attributes, protection attributes, extended link attributes. When the service path relates to multiple levels, the service control device needs to split the service path according to different levels, and triggers the establishment of the relevant service path at each level, wherein the triggering sequence is to trigger the establishment of the service layer LSP first and then trigger the establishment of the client layer LSP.
In the first embodiment, the service path establishment request carries a recovery attribute, where the recovery attribute indicates whether the established service path has a recovery capability; the method further comprises the following steps: and when a service path establishment request is sent to the first node of the service path, the calculated service path and the preset path are also sent to the first node of the service path.
Here, when there is a preset path, the preset path is used to recover the service after the service fails; and when the preset path does not exist, recalculating the service path after reporting the fault information, and restarting a service path establishment request, wherein the original path is taken as an associated path to be avoided during path calculation.
In a second embodiment, the service path establishment request carries a protection attribute, where the protection attribute indicates whether the established service path is in a working state or a protection state, and indicates a protection mode in the protection state; the sending a service path establishment request to a head node of a service path includes: and sending the plurality of calculated service paths and the protection attributes to a first node of the service path.
In a third embodiment, the service path establishment request carries an extended link attribute, where the extended link attribute indicates that the established service path forms a link; the sending a service path establishment request to a head node of a service path includes: and sending the extended link attribute to a head node of the service path.
Step 103: and when the establishment or recovery of the service path is successful, updating the stored actual service path.
In the embodiment of the invention, after the business path is successfully established or recovered, the first node reports the success of the establishment or the recovery of the business path to the business control device, and the business control device receives the message and updates the stored business actual path.
In the embodiment of the invention, the service path is in a maintenance state after being established, when the fault monitoring point detects a fault, the first node of the service path is informed by using an RSVP protocol, and the first node of the service path informs a service control device of updating the related service state. When the fault monitoring point detects the fault, the information which indicates that the service state is the service fault and sent by the first node is received, and the service state is updated. Then, the service control device determines whether to perform operations such as recovery and reply according to the service state, and re-triggers the establishment or recovery of the service path.
Fig. 2 is a schematic structural composition diagram of a service control apparatus according to an embodiment of the present invention, and as shown in fig. 2, the apparatus includes:
a service control module 21, configured to receive a service establishment request through a first interface 41; sending a path calculation request to a path calculation module according to the service attribute and the service state;
a path calculation module 22, configured to calculate a service path or a service restoration path;
the service control module 21 is further configured to send the calculated service path or service restoration path to a first node of the service path through the second interface 42, and send a service path establishment request to the first node, so that the first node establishes the service path or restores the service path through RSVP;
and the path management module 23 is configured to update the stored actual service path after the service path is successfully established or restored.
In the embodiment of the present invention, the apparatus further includes: a service state management module 24, configured to store a service state of the service path;
the path calculation module 22 is further configured to directly calculate a service path when the service state is service establishment; when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
wherein, the request content in the service establishment request includes: the method comprises the following steps that (1) the head and tail access point information, the service grade information, the service flow parameter, the signal type, the recovery attribute and the protection attribute of a service in a transmission network are obtained; the service attributes include: and receiving request content and an associated path in the service establishment request.
In this embodiment of the present invention, the service state management module 24 is further configured to receive, when a fault is detected by the fault monitoring point, information that indicates that the service state is a service fault and sent by the head node, and update the service state.
In the embodiment of the invention, the service path establishing request carries a recovery attribute, and the recovery attribute indicates whether the established service path has recovery capability or not;
the service control module 21 is further configured to send the restoration attribute to a head node of the service path.
In the embodiment of the invention, the service path establishing request carries a recovery attribute, and the recovery attribute indicates whether the established service path has recovery capability or not;
the service control module 21 is further configured to send the restoration attribute to a head node of the service path.
In this embodiment of the present invention, the service control module 21 is further configured to, when a preset path exists, recover a service using the preset path after the service fails; when the preset path does not exist, after the fault information is reported, the path calculation module 22 recalculates the service path and restarts the service path establishment request, wherein the original path is taken as the associated path to be avoided during the path calculation.
In the embodiment of the present invention, the service path establishment request carries a protection attribute, where the protection attribute indicates whether the established service path is in a working state or a protection state, and indicates a protection mode when the established service path is in the protection state;
the service control module 21 is further configured to send the calculated multiple service paths and the protection attribute to a head node of the service path.
In the embodiment of the invention, the service path establishing request carries an extended link attribute which indicates that the established service path forms a link;
the service control module 21 is further configured to send the extended link attribute to a head node of the service path.
It will be understood by those skilled in the art that the functions implemented by the units in the traffic control apparatus shown in fig. 2 can be understood by referring to the related description of the traffic control method described above. The functions of the units in the traffic control apparatus shown in fig. 2 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.
The service control method according to the embodiment of the present invention is further described in detail with reference to specific scenarios.
Scene one
And if the service to be established needs to recover the attribute, after the service fault is monitored, the service is recovered through establishing a new path. And when the service is established, the service control device informs the first node of the service path of the recovery attribute by triggering the LSP establishment message. The restoration attribute indicates whether the established LSP has restoration capability, if the restoration path after the fault is specified in a preset mode, the restoration path can also be issued in the restoration attribute, and a plurality of preset restoration paths can be set to meet the requirement of multiple restoration.
After the failure occurs, the failure is known by the first node of the LSP, if the LSP has the recovery capability, the recovery flow is started, otherwise, the LSP failure is reported to notify the service control device.
If the LSP has a preset recovery path, the LSP head node directly uses the preset recovery path to establish a new LSP, and reports the path corresponding to the new LSP to a service control device after the establishment is successful, and a service control module associates the LSP to a service and updates the path corresponding to the new LSP to a service path management module; if the restoration path is not preset, the LSP first node reports to a service control device to inform the service failure, the service control device confirms that the service has the restoration capability, initiates new path calculation, triggers new LSP service path establishment to the first node after obtaining a new service path, reports the LSP service path establishment to a service control module after the establishment is successful, and the service control module associates the LSP into the service and updates the corresponding path of the new LSP to a path management module.
Scene two
When the service is established, the service control device informs each LSP and the corresponding protection attribute to the first node of the service path by triggering the LSP establishment message. The protection attribute indicates whether the LSP is a working LSP or a protection LSP, and the protection mode refers to 1+1, 1:1, m: n, etc.
After the service fails, the transmission device switches rapidly according to the protection configuration, and the service head node needs to determine the LSP where the service traffic is located, notify the state PCE, and update to the path management module.
Scene three
When the service to be established spans multiple layers, when the service is established, the path of each layer is indicated in the service path calculated by the path calculation module, the service is respectively established in each layer, after the service layer service is established successfully, a TE link is formed to be used by the service layer service, firstly, a trigger LSP establishment message is issued at the first node of the service layer LSP, the link attribute is expanded in the trigger LSP establishment message to indicate that a link needs to be formed after the LSP is established, after the service layer LSP is established successfully, the service control device is reported, the link information formed by the service layer LSP is notified to the service control device, then, the trigger LSP establishment message is issued to the client layer to establish the related service.
Fig. 3 shows a two-layer network, where links 22a, 22b, 22c are service layer links and links 11a, 11b are client layer links. The service control device receives the service establishment request, establishes a transmission service from the node 1 to the node 4, and determines a service path from the node 1 to the node 4 through the links 11a, 22b, 22c and 11b by calculation, wherein the service layer path is the links 22a, 22b and 22 c. The service control device firstly sends a trigger LSP establishment message (1) to the node 2, wherein the message carries a service layer path and link attributes, the link attributes indicate that a client layer link is formed after the service layer service is successfully established, the node 2 initiates the establishment of the service layer service by utilizing an RSVP protocol, the establishment is successful finally through the interaction of the RSVP protocol, and the link 11c is abstracted. After the service layer service is successfully established, the node 2 informs the service control device of the abstracted information of the client layer service establishment 11c and the service layer service establishment success through the report message (2), the service control device determines that the client layer service paths are the links 11a, 11c and 11b, the client layer service paths are sent to the node 1 through triggering the LSP establishment message (3), the node 1 initiates establishment of the client layer service by utilizing an RSVP protocol, the client layer service is carried with the client layer paths, the establishment is finally successful through RSVP protocol interaction, and the service control device is informed of the successful establishment of the service through the report message (4).
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for traffic control, the method comprising:
receiving a service establishing request, and calculating a service path or a service recovery path according to the service attribute and the service state;
according to the service path or the service restoration path obtained by calculation, sending a service path establishment request to a first node of the service path so that the first node establishes the service path or restores the service path through a resource reservation protocol RSVP;
when the establishment or recovery of the service path is successful, updating the stored actual service path;
the calculating a service path or a service restoration path according to the service attribute and the service state includes:
when the service state is the service establishment, directly calculating a service path;
when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
wherein, the request content in the service establishment request includes: the method comprises the following steps that (1) the head and tail access point information, the service grade information, the service flow parameter, the signal type, the recovery attribute and the protection attribute of a service in a transmission network are obtained; the service attributes include: receiving request content and an associated path in a service establishment request;
the service path establishing request carries an extended link attribute which indicates that the established service path forms a link for establishing a multi-layer service path;
the sending a service path establishment request to a head node of a service path includes:
and sending the extended link attribute to a head node of the service path.
2. The traffic control method according to claim 1, wherein the method further comprises:
and when the fault monitoring point detects a fault, receiving information which indicates that the service state is a service fault and sent by the first node, and updating the service state.
3. The traffic control method according to claim 1, wherein the traffic path establishment request carries a restoration attribute, and the restoration attribute indicates whether the established traffic path has a restoration capability;
the method further comprises the following steps: and when a service path establishment request is sent to the first node of the service path, the calculated service path and the preset path are also sent to the first node of the service path.
4. The traffic control method according to claim 3, wherein the method further comprises:
when a preset path exists, recovering the service by using the preset path after the service fails;
and when the preset path does not exist, recalculating the service path after reporting the fault information, and restarting a service path establishment request, wherein the original path is taken as an associated path to be avoided during path calculation.
5. The service control method according to claim 1, wherein the service path establishment request carries a protection attribute, and the protection attribute indicates whether the established service path is in a working state or a protection state, and a protection mode in the protection state;
the sending a service path establishment request to a head node of a service path includes:
and sending the plurality of calculated service paths and the protection attributes to a first node of the service path.
6. A traffic control apparatus, characterized in that the apparatus comprises:
the service control module is used for receiving a service establishment request through a first interface; sending a path calculation request to a path calculation module according to the service attribute and the service state;
the path calculation module is used for calculating a service path or a service recovery path;
the service control module is further configured to send the calculated service path or service restoration path to a first node of the service path through a second interface, and send a service path establishment request to the first node, so that the first node establishes the service path or restores the service path through RSVP;
the path management module is used for updating the stored actual service path after the service path is successfully established or recovered;
further comprising: the service state management module is used for storing the service state of the service path;
the path calculation module is further configured to directly calculate a service path when the service state is service establishment; when the service state is a service fault, calculating a service recovery path according to the recovery attribute in the service attribute information and the associated path;
wherein, the request content in the service establishment request includes: the method comprises the following steps that (1) the head and tail access point information, the service grade information, the service flow parameter, the signal type, the recovery attribute and the protection attribute of a service in a transmission network are obtained; the service attributes include: receiving request content and an associated path in a service establishment request;
the service path establishing request carries an extended link attribute which indicates that the established service path forms a link for establishing a multi-layer service path;
and the service control module is further configured to send the extended link attribute to a head node of the service path.
7. The service control device according to claim 6, wherein the service state management module is further configured to receive, when the fault monitoring point detects a fault, information that the service state is a service fault and sent by the head node, and update the service state.
8. The traffic control device according to claim 7, wherein the traffic path establishment request carries a restoration attribute, and the restoration attribute indicates whether the established traffic path has a restoration capability;
and the service control module is further configured to send the restoration attribute to a head node of the service path.
9. The traffic control device according to claim 8, wherein the traffic control module is further configured to, when a preset path exists, recover the traffic using the preset path after the traffic fails; and when the preset path does not exist, reporting the fault information, then recalculating the service path by the path calculation module, and restarting a service path establishment request, wherein the original path is taken as an associated path to be avoided during path calculation.
10. The service control device according to claim 7, wherein the service path establishment request carries a protection attribute, and the protection attribute indicates whether the established service path is in a working state or a protection state, and indicates a protection mode in the protection state;
and the service control module is also used for sending the calculated multiple service paths and the protection attributes to the first node of the service path.
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| CN201510355134.XA CN106330695B (en) | 2015-06-24 | 2015-06-24 | Service control method and device |
| PCT/CN2016/082269 WO2016206502A1 (en) | 2015-06-24 | 2016-05-16 | Service control method and apparatus, and computer storage medium |
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| CN111417927B (en) * | 2018-03-27 | 2021-12-03 | 华为技术有限公司 | Resource authority processing method and device, storage medium and chip |
| US10652084B2 (en) | 2018-05-01 | 2020-05-12 | At&T Intellectual Property I, L.P. | Service recovery in a software defined network |
| US11388056B2 (en) * | 2018-05-17 | 2022-07-12 | Nippon Telegraph And Telephone Corporation | Information management system and information management method |
| CN110392318B (en) * | 2019-07-29 | 2021-10-19 | 烽火通信科技股份有限公司 | Method and system for checking control plane layer LSP (Label switched Path) in ASON (automatic switched optical network) |
| CN112337099B (en) * | 2020-10-27 | 2024-01-12 | 腾讯科技（北京）有限公司 | Service management method and device |
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| CN102055662A (en) * | 2009-11-06 | 2011-05-11 | 中兴通讯股份有限公司 | Method and device for determining preset routing |
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| CN104333511B (en) * | 2013-07-22 | 2019-01-08 | 华为技术有限公司 | Determine the method, apparatus and system of service transmission path |
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| CN101030939A (en) * | 2007-03-27 | 2007-09-05 | 华为技术有限公司 | Method and apparatus for establishing and restoring label exchange path in automatic-exchange optical network |
| CN101321115A (en) * | 2007-06-07 | 2008-12-10 | 华为技术有限公司 | A method and system for establishing a service path and a node device |
| CN101651625A (en) * | 2009-09-03 | 2010-02-17 | 中兴通讯股份有限公司 | Route selecting device and route selecting method of multi-service restoration |
| CN102055662A (en) * | 2009-11-06 | 2011-05-11 | 中兴通讯股份有限公司 | Method and device for determining preset routing |
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