CN104104747A - Method and device for message transmission - Google Patents
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Abstract
The invention provides a method and device for message transmission. The method and device for message transmission are applied to a VXLAN tunnel end point (VTEP) device on the side of a dynamic host configuration protocol (DHCP) server in virtual extensible local area network (VXLAN) networking. The method comprises the steps of enabling a VXLAN network identifier (VNI) corresponding to a tunnel port for receiving DHCP client request messages to be added to the DHCP client request messages when the DHCP client request messages are received from a VXLAN tunnel, and sending the DHCP client request messages to the DHCP server, so that the DHCP server distributes addresses of corresponding address fields to DHCP clients according to the VNI. According to the technical scheme, the DHCP server can identify a VXLAN which the current DHCP client request messages belong to directly according to VPI information, and accordingly correct IP addresses are distributed to the corresponding DHCP clients.
Description
Technical field
The present invention relates to communication technical field, relate in particular to message transmitting method and device.
Background technology
VXLAN (Virtual Extensible LAN, can expand Virtual Local Area Network) is a large double layer network, and the virtual machine of identical VXLAN (VM, Virtual Machine) is in same logic double layer network, logic isolation between different VXLAN.Local edge device is divided and two layers of forwarding local VM according to VXLAN, and local terminal edge device can add VXLAN network identity head and the tunnel UDP head of local virtual machine when opposite end edge device sends message, and forward the packet to opposite end edge device by the VXLAN tunnel of setting up in advance, opposite end edge device is carrying out after decapsulation UDP head and VXLAN network identity head, by message, give opposite end VM, thereby complete the message transmissions between local VM and opposite end VM.
VM is as dhcp client, need to be to Dynamic Host Configuration Protocol server applied address, and due to logic isolation between different VXLAN, just need each VXLAN to configure a Dynamic Host Configuration Protocol server.Yet in a large number of users access VXLAN networking, the quantity of required Dynamic Host Configuration Protocol server also increases, thereby takies ample resources thereupon.
In correlation technique, having proposed to select a VM as Dynamic Host Configuration Protocol server in VXLAN networking, is other dhcp clients distribution addresses by this VM.Yet, some VM are during as Dynamic Host Configuration Protocol server, the TAG (being arranged in the VLAN ID Tag field of Ethernet head (Ethernet Head)) in the DHCP message that dhcp client sends can not be effectively distinguished, thereby correct IP address can not be distributed for the VM of different VXLAN.
Summary of the invention
In view of this, the invention provides a kind of new technical scheme, can solve the technical problem of the TAG in part Dynamic Host Configuration Protocol server None-identified DHCP message in correlation technique.
For achieving the above object, the invention provides technical scheme as follows:
According to a first aspect of the invention, proposed a kind of message transmitting method, be applied to expand the VXLAN tunnel ends node VTEP equipment of the dynamic host configuration protocol DHCP server side in Virtual Local Area Network VXLAN networking, having comprised:
When receiving dhcp client request message from VXLAN tunnel, VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message is added in described dhcp client request message and is sent to Dynamic Host Configuration Protocol server, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
According to a second aspect of the invention, proposed a kind of message transmitting device, be applied to expand the VXLAN tunnel ends node VTEP equipment of the dynamic host configuration protocol DHCP server side in Virtual Local Area Network VXLAN networking, having comprised:
Adding device, for when receiving dhcp client request message from VXLAN tunnel, is added into VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message in described dhcp client request message;
Transmitting element, for the dhcp client request message that has added described VNI is sent to Dynamic Host Configuration Protocol server, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
From above technical scheme, the present invention is by being parsed the VNI in dhcp client request message by VTEP, and this VNI is encapsulated in DHCP message, make Dynamic Host Configuration Protocol server can be directly according to VNI information, identify the VXLAN under current dhcp client request message, thereby guarantee to distribute correct IP address for corresponding dhcp client.
Accompanying drawing explanation
Fig. 1 shows according to the schematic network structure of an exemplary embodiment of the present invention;
Fig. 2 shows according to the schematic flow diagram of the message transmitting method of an exemplary embodiment of the present invention;
Fig. 3 shows according to the schematic diagram of option structure in the dhcp client request message of an exemplary embodiment of the present invention;
Fig. 4 shows according to the schematic flow diagram of the message transmitting method of another exemplary embodiment of the present invention;
Fig. 5 shows according to the schematic block diagram of the message transmitting device of an exemplary embodiment of the present invention.
Embodiment
Distribution by from the virtual machine facility in VXLAN network (VM, Virtual Manufacturing) to Dynamic Host Configuration Protocol server IP address requesting.As stated in the Background Art, due to logic isolation between different VXLAN, as a kind of execution mode, in correlation technique, proposed to configure independently Dynamic Host Configuration Protocol server for each VXLAN, every Dynamic Host Configuration Protocol server does not need different VXLAN to distinguish, but can cause taking too much resource.In order to solve, take the too much technical problem of resource, in correlation technique, further proposed as same Dynamic Host Configuration Protocol server of all VXLAN configurations, but this makes Dynamic Host Configuration Protocol server must effectively distinguish different VXLAN, thereby be that different VXLAN distribute corresponding correct IP address.
Particularly, Fig. 1 shows according to the network configuration of an exemplary embodiment of the present invention.Please refer to Fig. 1, VM1 and VM2 be respectively in VXLAN1 and VXLAN2, and be all registered as dhcp client (client); VM1, VM2 philosophy are connected to the VXLAN tunnel ends node VTEP equipment of dhcp client side, i.e. VTEP-A; Between the VXLAN tunnel ends node VTEP equipment (being VTEP-B) of Dynamic Host Configuration Protocol server side and VTEP-A, set up tunnel, thereby make the virtual machines such as VM1, VM2 can pass through this tunnel to IP address corresponding to Dynamic Host Configuration Protocol server request.Therefore, one embodiment of the invention has proposed a kind of message transmitting method as shown in Figure 2, and the method is applied to the VTEP equipment (such as the VTEP-B in Fig. 1) of the Dynamic Host Configuration Protocol server side in VXLAN networking, comprising:
Step 202, when receiving dhcp client request message from VXLAN tunnel, is added into VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message in described dhcp client request message;
Step 204, is sent to Dynamic Host Configuration Protocol server by the dhcp client request message that has added described VNI, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
From above-described embodiment, the present invention is by carrying out preliminary treatment to the dhcp client request message from dhcp client on the VTEP equipment in Dynamic Host Configuration Protocol server side, make Dynamic Host Configuration Protocol server can directly according to VNI information, accurately understand and identify the VXLAN under current dhcp client request message, and correctly distribute corresponding IP address for corresponding dhcp client (being VM).
Wherein, VNI information can be added in the option structure in dhcp client request message.Particularly, option structure in dhcp client request message can adopt " TLV (Type-length-value; type-length-value) " form, such as Fig. 3 shows the option structure of an exemplary embodiment, value in Code field is wherein for showing the type of message in current option structure, value in Len field is for showing the length that VNI field takies, and value in VNI is the VNI parsing in the dhcp client request message that the VTEP of Dynamic Host Configuration Protocol server side receives; Particularly, in the option structure shown in Fig. 3, utilize Code=30 to show that the message in current option structure is VNI, and supposition VNI is now specially 5.Certainly, it will be understood by those skilled in the art that except the option structure shown in Fig. 3, as long as can uniquely be applied to the encapsulation of VNI message, obviously also can adopt the combination of other Code value, Len value etc., will not enumerate herein.
Dhcp client request message for receiving, please refer to Fig. 4, the present invention proposes the technical scheme of the VTEP that is further applied to Dynamic Host Configuration Protocol server side, comprising:
Step 402, when receiving dhcp client request message, proceeds to step 404;
Step 404, the dhcp client request message that parsing receives, and in mapping table, record dhcp client ID, receive the corresponding relation between VXLAN network identifier VNI corresponding to the Ji Gai tunnel face, tunnel face of dhcp client request message, as the mapping item in mapping table;
Particularly, mapping item can be by formations such as dhcp client ID (generating and sending the dhcp client of this dhcp client request message), public network tunnel face and VNI.Such as for the VM1 shown in Fig. 1, suppose that VTEP-B, when the dhcp client request message receiving from VM1, has generated mapping item as shown in table 1.
| VNI | Client id | Public network tunnel face |
| 5 | 001 | 1 |
| 8 | 003 | 3 |
| … | … | … |
Table 1
Step 406, when receiving the DHCP request response message (being DHCP Offer message) that Dynamic Host Configuration Protocol server returns, proceeds to step 408;
Step 408, resolves the information such as dhcp client ID in the DHCP request response message receiving, to determine the mapping item matching;
Step 410, according to the mapping item matching, encapsulates and sends DHCP request response message.
Particularly, the dhcp client request response message that the dhcp client ID receiving from Dynamic Host Configuration Protocol server such as VTEP-B is 001, can inquire the mapping item corresponding to VM1 shown in table 1, VTEP-B is the address information (as source IP and object IP) of 1 correspondence etc. according to VNI=5, tunnel face, and this DHCP request response message is carried out to tunnel encapsulation and forwarding.
Therefore, by the technical scheme shown in Fig. 2 and Fig. 4, can identify respectively the dhcp client request message that the dhcp client under different VXLAN sends, and ask response message to be back to corresponding dhcp client DHCP, thereby by a Dynamic Host Configuration Protocol server, realize the IP address assignment to VM in a plurality of VXLAN.
In addition, the mapping item that each dhcp client is corresponding can be stored in the VTEP equipment (VTEP-B as shown in Figure 1) of Dynamic Host Configuration Protocol server side, and can repeatedly be applied to the transmission to dhcp client request message and DHCP request response message.Meanwhile, when receiving while discharging message from the DHCP of dhcp client, according to this dhcp client ID, delete the mapping item matching with this dhcp client ID.
Meanwhile, the present invention has also proposed corresponding solution for pseudo-Dynamic Host Configuration Protocol server, comprising:
As an illustrative embodiments, can be in advance by the VLAN ID tag configurations of real Dynamic Host Configuration Protocol server on the VTEP of Dynamic Host Configuration Protocol server side equipment, this VTEP equipment is when the dhcp client request message receiving from dhcp client, can, according to the pre-configured above-mentioned VLAN ID label in this locality, dhcp client request message (being wherein packaged with the option structure that comprises VNI) be encapsulated;
As another exemplary embodiment, can in advance outgoing interface corresponding to real Dynamic Host Configuration Protocol server be configured on the VTEP equipment of Dynamic Host Configuration Protocol server side, this VTEP equipment is when the dhcp client request message receiving from dhcp client, can obtain local pre-configured above-mentioned outgoing interface, and be directly used in transmission dhcp client request message.
The situation in different segment for Dynamic Host Configuration Protocol server and dhcp client, in order not affect the unicast forwarding of dhcp client request message, the present invention has further proposed the following VTEP equipment for Dynamic Host Configuration Protocol server side and has carried out improved technical scheme, comprising:
When receiving the DHCP request response message that Dynamic Host Configuration Protocol server returns, in this DHCP request response message, add and take the routing iinformation of subnet broadcast address of place, the address network segment as the distribution of dhcp client side that the IP address of described Dynamic Host Configuration Protocol server comprises as destination address, down hop as this dhcp response message in, thereby make dhcp client generate this routing iinformation;
Meanwhile, VTEP equipment also generates answers list item corresponding to ARP generation of described Dynamic Host Configuration Protocol server, and wherein this ARP generation is answered and for answering IP, described subnet broadcast address, generation answers the MAC Address that MAC is this Dynamic Host Configuration Protocol server in list item.
Particularly, such as in the network configuration shown in Fig. 1, VTEP-B is for generating above-mentioned routing iinformation and ARP for answering list item.Corresponding to VM1, IP address, the down hop that the destination address of the routing iinformation that VTEP-B generates is Dynamic Host Configuration Protocol server is that Dynamic Host Configuration Protocol server is the subnet broadcast address of place, the IP address network segment of VM1 distribution; Corresponding to VM2, IP address, the down hop that the destination address of the routing iinformation that VTEP-B generates is Dynamic Host Configuration Protocol server is that Dynamic Host Configuration Protocol server is the subnet broadcast address of place, the IP address network segment of VM2 distribution.
Based on VM1 or VM2 when sending unicast message to Dynamic Host Configuration Protocol server, can first initiate the ARP request for the subnet broadcast address of self place, IP address network segment, VTEP-B answers list item according to ARP generation of pre-stored, return to the MAC Address of Dynamic Host Configuration Protocol server, when thereby dhcp client carries out two layers of forwarding dhcp client request message according to this MAC Address, can be sent to Dynamic Host Configuration Protocol server.
Corresponding to above-mentioned message transmitting method, the invention allows for a kind of message transmitting device, be applied to expand the VXLAN tunnel ends node VTEP equipment of the dynamic host configuration protocol DHCP server side in Virtual Local Area Network VXLAN networking, comprising:
Adding device, for when receiving dhcp client request message from VXLAN tunnel, is added into VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message in described DHCP message;
Transmitting element, for the DHCP message that has added described VNI is sent to Dynamic Host Configuration Protocol server, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
Optionally, can also comprise acquiring unit, for:
Obtain the VLAN ID label of local pre-configured Dynamic Host Configuration Protocol server, this VLAN ID label, for to after being packaged with the DHCP message of described VNI and encapsulating, is sent to Dynamic Host Configuration Protocol server by described transmitting element;
And/or obtain the outgoing interface of local pre-configured Dynamic Host Configuration Protocol server, and by described transmitting element, by this outgoing interface, sent the DHCP message that has added described VNI.
Optionally, can also comprise:
Record cell for when receiving described dhcp client request message, records dhcp client, receives the corresponding relation between VXLAN network identifier VNI corresponding to the Ji Gai tunnel face, tunnel face of dhcp client request message in mapping table;
Matching unit, for when receiving the DHCP request response message that Dynamic Host Configuration Protocol server returns, mates the dhcp client ID comprising in this DHCP request response message with described mapping table;
Processing unit, for according to the VNI of mapping item and the information of tunnel face that are matched with this dhcp client ID, described DHCP request response message being encapsulated, and is sent to dhcp client by described transmitting element.
Optionally, can also comprise:
Delete cells, for when receiving the DHCP release message of dhcp client, according to this dhcp client ID, deletes the mapping item matching with this dhcp client ID.
Optionally, can also comprise:
Generation unit, for when receiving DHCP that Dynamic Host Configuration Protocol server returns and ask response message, in this DHCP request response message, add and take the routing iinformation of subnet broadcast address of place, the address network segment as dhcp client distribution that the IP address of described Dynamic Host Configuration Protocol server comprises as destination address, down hop in this DHCP request response message, and generate and to answer list item corresponding to ARP generation of described Dynamic Host Configuration Protocol server, wherein in this ARP generation, is answered and for answering IP, described subnet broadcast address, generation answers the MAC Address that MAC is this Dynamic Host Configuration Protocol server in list item.
Therefore, the present invention is by being parsed the VNI in DHCP message by VTEP, and this VNI is encapsulated in dhcp client request message with the form of option, make Dynamic Host Configuration Protocol server can be directly according to VNI information, identify the VXLAN under current dhcp client request message, thereby guarantee to distribute correct IP address for corresponding dhcp client.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (10)
1. a message transmitting method, is characterized in that, is applied to expand the VXLAN tunnel ends node VTEP equipment of the dynamic host configuration protocol DHCP server side in Virtual Local Area Network VXLAN networking, comprising:
When receiving dhcp client request message from VXLAN tunnel, VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message is added in described dhcp client request message and is sent to Dynamic Host Configuration Protocol server, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
2. method according to claim 1, is characterized in that, the dhcp client request message that has added described VNI is sent to Dynamic Host Configuration Protocol server and specifically comprises:
Obtain the VLAN ID label of local pre-configured Dynamic Host Configuration Protocol server, this VLAN ID label, to after being packaged with the dhcp client request message of described VNI and encapsulating, is sent to Dynamic Host Configuration Protocol server;
And/or obtain the outgoing interface of local pre-configured Dynamic Host Configuration Protocol server, and by this outgoing interface, send the dhcp client request message that has added described VNI.
3. method according to claim 1, is characterized in that, also comprises:
When receiving described dhcp client request message, in mapping table, record dhcp client, receive the corresponding relation between VXLAN network identifier VNI corresponding to the Ji Gai tunnel face, tunnel face of dhcp client request message;
When receiving the DHCP request response message that Dynamic Host Configuration Protocol server returns, the dhcp client ID comprising in this DHCP request response message is mated with described mapping table, according to being matched with VNI in the mapping item of this dhcp client ID and the information of tunnel face, to described DHCP, ask response message to encapsulate and send to dhcp client.
4. method according to claim 3, is characterized in that, also comprises:
When receiving the DHCP release message of dhcp client, according to this dhcp client ID, delete the mapping item matching with this dhcp client ID.
5. method according to claim 1, is characterized in that, also comprises:
When receiving the DHCP request response message that Dynamic Host Configuration Protocol server returns, in this DHCP request response message, add and take the routing iinformation of subnet broadcast address of place, the address network segment as dhcp client distribution that the IP address of described Dynamic Host Configuration Protocol server comprises as destination address, down hop as this dhcp response message in, and generate and to answer list item corresponding to ARP generation of described Dynamic Host Configuration Protocol server, wherein in this ARP generation, is answered and for answering IP, described subnet broadcast address, generation answers the MAC Address that MAC is this Dynamic Host Configuration Protocol server in list item.
6. a message transmitting device, is characterized in that, is applied to expand the VXLAN tunnel ends node VTEP equipment of the dynamic host configuration protocol DHCP server side in Virtual Local Area Network VXLAN networking, comprising:
Adding device, for when receiving dhcp client request message from VXLAN tunnel, is added into VXLAN network identifier VNI corresponding to tunnel face that receives described dhcp client request message in described dhcp client request message;
Transmitting element, for the dhcp client request message that has added described VNI is sent to Dynamic Host Configuration Protocol server, so that described Dynamic Host Configuration Protocol server is the address that described dhcp client distributes corresponding address section according to described VNI.
7. device according to claim 6, is characterized in that, also comprises acquiring unit, for:
Obtain the VLAN ID label of local pre-configured Dynamic Host Configuration Protocol server, this VLAN ID label, to after being packaged with the dhcp client request message of described VNI and encapsulating, is sent to Dynamic Host Configuration Protocol server by described transmitting element;
And/or obtain the outgoing interface of local pre-configured Dynamic Host Configuration Protocol server, and by described transmitting element, by this outgoing interface, sent the dhcp client request message that has added described VNI.
8. device according to claim 6, is characterized in that, also comprises:
Record cell for when receiving described dhcp client request message, records dhcp client, receives the corresponding relation between VXLAN network identifier VNI corresponding to the Ji Gai tunnel face, tunnel face of dhcp client request message in mapping table;
Matching unit, for when receiving the DHCP request response message that Dynamic Host Configuration Protocol server returns, mates the dhcp client ID comprising in this DHCP request response message with described mapping table;
Processing unit, for according to the VNI of mapping item and the information of tunnel face that are matched with this dhcp client ID, described DHCP request response message being encapsulated, and is sent to dhcp client by described transmitting element.
9. device according to claim 8, is characterized in that, also comprises:
Delete cells, for when receiving the DHCP release message of dhcp client, according to this dhcp client ID, deletes the mapping item matching with this dhcp client ID.
10. device according to claim 6, is characterized in that, also comprises:
Generation unit, for when receiving DHCP that Dynamic Host Configuration Protocol server returns and ask response message, in this DHCP request response message, add and take the routing iinformation of subnet broadcast address of place, the address network segment as dhcp client distribution that the IP address of described Dynamic Host Configuration Protocol server comprises as destination address, down hop in this DHCP request response message, and generate and to answer list item corresponding to ARP generation of described Dynamic Host Configuration Protocol server, wherein in this ARP generation, is answered and for answering IP, described subnet broadcast address, generation answers the MAC Address that MAC is this Dynamic Host Configuration Protocol server in list item.
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