CN103227745A - Intercommunication method of shortest path bridging network and Layer 3 virtual private network and common edge equipment - Google Patents
Intercommunication method of shortest path bridging network and Layer 3 virtual private network and common edge equipment Download PDFInfo
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Abstract
The invention discloses an intercommunication method of a shortest path bridging (SPB) network and a Layer 3 virtual private network (L3VPN), and common edge equipment. The method comprises the steps that the SPB network is connected with the L3VPN by the common edge equipment; the edge equipment serves as BEB (backbone edge bridge) equipment of the SPB network and PE (provider edge) equipment of the L3VPN simultaneously; association relationships between VPN instances and VSIs (virtual service instances) of the SPB network are configured on the edge equipment; each VPN instance is provided with a gateway interface; MAC (media access control) addresses of the gateway interfaces of the different VPN instances are different; for each VPN instance, the common edge equipment learns an IP (internet protocol) address resolution table entry and a host routing table entry of the common edge equipment at an SPB PW opposite end, learns a VPN routing table entry in the VPN instance of the common edge equipment at the opposite end according to the learned host routing table entry, and forwards a message from the VPN to the SPB network, or a message from the SPB network to the VPN according to the learned table entries. The equipment cost for the intercommunication of the SPB network and the L3VPN is lowered.
Description
Technical field
The present invention relates to wireless technical field, be specifically related to shortest path bridge (SPB, Shortest Path Bridging) net and layer 3 VLAN (L3VPN, Layer3Virtual Private Network) interoperability methods and common edge device.
Background technology
SPB is Institute of Electrical and Electric Engineers (IEEE, Institute of Electrical and Electronics Engineers) one of ethernet standard of 802.1aq definition, be many examples Spanning-Tree Protocol (MSTP, Multiple Spanning Tree Protocol) further extension, be intended to make up the clog-free double layer network of large flat, use SPB-Intermediate System-to-Intermediate System (ISIS, Intermediate System to Intermediate System) comes the Link State in the shared network, shortest path between each each node of node parallel computation of network, unsteadiness and the low deficiency of part of links utilization ratio of having avoided use Spanning-Tree Protocol (STP, Spanning Tree Protocol) to bring.802.1aq defined two SPB patterns: VLAN (VLAN, Virtual Local Area Network) pattern (SPBV) and M-in-M pattern (SPBM), wherein SPBM is present main recommendation pattern, is extensive use of in data center network.
In the SPBM network, backbone network mainly comprises backbone network edge bridges (BEB, Backbone Edge Bridge) and the equipment of backbone network core bridges types such as (BCB, Backbone Core Bridge) and the backbone links between these equipment.Wherein:
BEB: be equivalent to service provider network edge (PE, the Provider Edge) equipment in the MPLS network.It is responsible for the message from user's network is carried out the M-in-M encapsulation, and the M-in-M message that obtains is forwarded in the backbone network, perhaps will carry out decapsulation from the M-in-M message of backbone network, and be forwarded in the user network.
BCB: be equivalent to the P equipment in the MPLS network.It is responsible for according to backbone network media access control address (B-MAC, Backbone Media Access Control) and backbone network VLAN(B-VLAN, Backbone VLAN) forwarding M-in-M message.The BCB device just will E-Packet and learn the MAC Address in the backbone network, does not need to learn MAC Address a large amount of in the user network, thereby has reduced the cost of network design, also provides better extensibility for backbone network.
SPBM has inherited the encapsulation format of the M-in-M of 802.1ah definition.Fig. 1 is the M-in-M message encapsulation format schematic diagram of existing SPBM definition, as shown in Figure 1, the original Ethernet packet outer layer of user has increased virtual service instance (VSI, Virtual Service Instance), B-VLAN, B-MAC address information, backbone network is transmitted by these information.Wherein:
B-MAC/B-VLAN:BEB equipment can be stamped MAC Address and the VLAN of operator for this devices allocation for user's message when user's message being carried out the M-in-M encapsulation.Should just be called B-MAC address and B-VLAN by MAC Address and the VLAN that operator distributes.The B-MAC address comprises: B-MAC address, source and purpose B-MAC address, BEB equipment is when carrying out the M-in-M encapsulation to user's message, can be with oneself MAC Address as B-MAC address, source, the MAC Address of the BEB equipment of SPBM tunnel destination is encapsulated as purpose B-MAC address.
VSI and backbone network VSI numbering (I-SID, Backbone Service Instance Identifier): in backbone network, a VSI represents a class business or a user, and I-SID is the unique number of VSI.
Backbone network target MAC (Media Access Control) address (B-DA, Backbone Destination MAC address): i.e. purpose B-MAC address is the outer target MAC (Media Access Control) address of M-in-M encapsulation, is the MAC Address of the BEB equipment of SPBM tunnel destination.
Backbone network source MAC (B-SA, Backbone Source MAC address), i.e. source B-MAC address is the outer source MAC of M-in-M encapsulation, is the MAC Address of the BEB equipment of SPBM tunnel source end.
Backbone network VLAN label (B-Tag, Backbone VLAN Tag): i.e. B-VLAN Tag, be the outside VLAN Tag of M-in-M encapsulation, be used for identifying VLAN and the precedence information of message at backbone network, its tag protocol identifier (TPID, Tag Protocol Identifier) value is fixed as 0x88a8.
Backbone network VSI label (I-Tag, Backbone Service Instance Tag): the service marker in the M-in-M encapsulation, comprise: the I-SID of transmission priority I-PCP when message is handled on BEB equipment and loss priority I-DEI, sign VSI, its TPID value is fixed as 0x88e7.
Customer objective MAC Address (C-DA, Customer Destination MAC address): the target MAC (Media Access Control) address that user's message is original.
User source MAC Address (C-SA, Customer Source MAC address): the source MAC that user's message is original.
After BEB equipment is received user's message from the user-side port that connects user network, be mapped to the forwarding of tabling look-up among the corresponding VSI according to message inbound port and VLAN, if the outgoing interface of finding is the SPBM tunnel face, then according to the mapping relations of this VSI and B-VLAN, obtain B-Tag, use the I-SID of this VSI then, B-Tag and B-MAC carry out the M-in-M tunnel encapsulation to this user's message.After message after the process M-in-M tunnel encapsulation entered the SPB network, BCB equipment was transmitted according to B-MAC address, the B-VLAN of heading.
SPB provides two layers between the user of different regions interconnected.When BEB equipment is in the middle of SPB net and L3VPN, exchange visits between the territory of needs realization SPB net and L3VPN.Fig. 2 be existing SPB net to L3VPN exchanging visit networking schematic diagram, as shown in Figure 2:
The PE equipment of L3VPN is as the customer edge (CE of the BEB equipment of SPB net, Customer Edge) equipment, PE equipment to User IP message encapsulation MPLS label and two layers of head after, message is sent to BEB equipment, what BEB equipment received is two layers of Ethernet message or MPLS message, but BEB equipment is not paid close attention to type of message, only carrying out the MAC table according to target MAC (Media Access Control) address in the SPB net searches, E-Packet according to the result who searches, then encapsulate the M-in-M tunnel header and be forwarded to the SPB public network if target MAC (Media Access Control) address is the far-end MAC Address, if local mac address is then directly transmitted by local port.
What BEB equipment received in the SPB net is two layer message or M-in-M channel message, directly inquiring about the MAC table for two layer message transmits, for the M-in-M channel message earlier termination fall the M-in-M tunnel header and then carry out the MAC table and search, E-Packet according to Query Result.
Must SPB net and L3VPN be separated fully by actual networking equipment when the existing SPB and the L3VPN network interconnection, can't realize the integrated access of same edge device, be a kind of bigger waste to network equipment resource.
Summary of the invention
The invention provides SPB net and L3VPN interoperability methods and common edge device, the equipment cost during with reduction SPB net and L3VPN intercommunication.
Technical scheme of the present invention is achieved in that
A kind of shortest path bridge SPB and layer 3 VLAN L3VPN interoperability methods, the SPB net links to each other by a common edge device with L3VPN, this common edge device is simultaneously as the backbone network edge bridges BEB equipment of SPB net and the service provider network edge PE equipment of L3VPN, on this common edge device, dispose the incidence relation of the virtual service instance VSI of VPN instance and SPB net simultaneously, wherein, each VPN instance possesses a gateway interface IP address and media interviews control MAC Address, the gateway interface MAC Address difference of different VPN example, for the common edge device that is positioned at same SPB virtual link PW two ends, the gateway interface IP address of each VPN instance of configuration opposite end common edge device on each common edge device, this method comprises:
Each common edge device is published to the gateway interface MAC Address of each VPN instance of self in the SPB net, generates the forward-path of this MAC Address in the SPB net to trigger;
For each VPN instance, common edge device is according to the gateway interface IP address of the common edge device of the incidence relation of this VPN instance and VSI and SPB PW opposite end, the IP address resolution list item and the main frame route table items of study opposite end common edge device;
Common edge device is created the route table items of VPN instance by the gateway interface of VPN instance and the routing iinformation of the mutual VPN routing iinformation customer edge CE equipment separately of each opposite end common edge device;
Common edge device is according to the route table items of forward-path, IP address resolution list item and the described VPN instance of the gateway interface MAC Address of the VPN instance of learning, to be forwarded to from the message in the VPN in the SPB net, perhaps will be forwarded among the VPN from the message of SPB net.
The route table items of described establishment VPN instance comprises:
During VPN route in common edge device receives the VPN instance that the pair of end common edge device sends, with the gateway interface IP address of this VPN instance of opposite end common edge device next hop address as this route, and find the main frame route table items that mates with this VPN instance sign and next hop address, with the outgoing interface of the outgoing interface in this main frame route table items, set up the route table items of this VPN as this VPN route.
The IP address resolution list item and the main frame route table items of described common edge device study opposite end common edge device comprise:
For each VPN instance, the IP address resolution request message that the common edge device of common edge device reception SPB PW opposite end is sent, the VSI sign that comprises this VPN instance association in the outer layer tunnel head of this message, transmitting terminal MAC Address in two layers of head of the internal layer of this message is the gateway interface MAC Address of this VPN instance of opposite end common edge device, transmitting terminal IP address is the gateway interface IP address of this VPN instance of opposite end common edge device, destination end IP address is the gateway ip address of this VPN instance of this common edge device, VLAN ID is the VLAN ID of this VPN instance, edge device is determined VPN instance sign, study IP address resolution list item and main frame route table items according to the VLAN ID in the message.
Described common edge device will be forwarded to from the message in the VPN in the SPB net and comprise:
Common edge device receives the message from VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, arrive the route table items of corresponding VPN instance according to the purpose IP address search of message, find corresponding IP address resolution list item according to sign of the VPN instance in this list item and next hop address, according to this IP address resolution list item is two layers of head of message encapsulation, wherein, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of this edge device, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the IP address resolution list item, and this message is sent in the SPB net.
Described common edge device will be forwarded among the VPN from the message of SPB net and comprise:
Common edge device receives the message from the SPB net, the target MAC (Media Access Control) address of finding this message is the gateway interface MAC Address of this equipment one VPN instance, according to the purpose IP address search of message route table items, this message is carried out routing forwarding in this VPN instance to corresponding VPN instance.
A kind of common edge device, between SPB net and L3VPN, and simultaneously as the BEB equipment of SPB net and the PE equipment of L3VPN, this common edge device comprises:
Module is preserved in configuration: the incidence relation of preserving the VSI of VPN instance and SPB net, wherein, each VPN instance possesses a gateway interface IP address and MAC Address, the gateway interface MAC Address difference of different VPN example, the gateway interface IP address of each VPN instance of the common edge device of preservation SPB PW opposite end;
The list item study module: the gateway interface MAC Address that will dispose each VPN instance of preserving this equipment in the module is published in the SPB net, generates the forward-path of this MAC Address in the SPB net to trigger; For each VPN instance, preserve the gateway interface IP address of the common edge device of the incidence relation of this VPN instance and VSI in the module and SPB PW opposite end according to configuration, learn the IP address resolution list item and the main frame route table items of opposite end common edge device; By the gateway interface of VPN instance and the routing iinformation of the mutual VPN routing iinformation customer edge CE equipment separately of each opposite end common edge device, create the route table items of VPN instance;
Packet forwarding module: according to the route table items of forward-path, IP address resolution list item and the described VPN instance of the gateway interface MAC Address of the VPN instance in the list item study module, to be forwarded to from the message in the VPN in the SPB net, perhaps will be forwarded among the VPN from the message of SPB net.
Described list item study module is further used for, VPN route in the VPN instance of sending according to the opposite end common edge device, the next hop address of the gateway interface IP address of this VPN instance of preserving this opposite end common edge device in the module as this route will be disposed, and find the main frame route table items that mates with this VPN instance sign and next hop address, with the outgoing interface of the outgoing interface in this main frame route table items, set up the route table items of this VPN as this VPN route.
Described list item study module is further used for, when the IP address resolution list item of learning the opposite end common edge device and main frame route table items, for each VPN instance, when IP address resolution request message that the common edge device that receives SPB PW opposite end is sent, the VSI sign that comprises this VPN instance association in the outer layer tunnel head of this message, transmitting terminal MAC Address in two layers of head of the internal layer of this message is the gateway interface MAC Address of this VPN instance of this opposite end common edge device, transmitting terminal IP address is the gateway interface IP address of this VPN instance of this opposite end common edge device, destination end IP address is the gateway ip address of this VPN instance of this common edge device, VLAN ID is the VLAN ID of this VPN instance, determine VPN instance sign, study IP address resolution list item and main frame route table items according to the VLAN ID in the message.
Described packet forwarding module is further used for, when the message that receives from VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, in the list item study module, find the route table items of corresponding VPN instance according to the purpose IP address of message, in the list item study module, find corresponding IP address resolution list item according to sign of the VPN instance in this list item and next hop address, according to this IP address resolution list item is two layers of head of message encapsulation, wherein, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of this equipment, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the IP address resolution list item, and this message is sent in the SPB net.
Described packet forwarding module is further used for, when receiving the message of netting from SPB, if find that the target MAC (Media Access Control) address of message is the gateway interface MAC Address of this equipment one VPN instance, according to the purpose IP address search of message route table items, this message is carried out routing forwarding in this VPN instance to corresponding VPN instance.
Compared with prior art, the present invention is integrated L3VPN and SPB function on a common edge device, has realized the direct exchanging visit of SPB net and L3VPN, has saved network equipment resource, has reduced network equipment cost.
Description of drawings
Fig. 1 is the M-in-M message encapsulation format schematic diagram of existing SPBM definition;
Fig. 2 is that existing SPB net is to L3VPN exchanging visit networking schematic diagram;
Route learning method flow diagram when SPB net that Fig. 3 provides for the embodiment of the invention and L3VPN are interconnected;
Fig. 4 uses SPB net that example provides and the L3VPN networking diagram when interconnected for the present invention;
Message forwarding method flow chart when SPB net that Fig. 5 provides for the embodiment of the invention and L3VPN are interconnected;
The composition schematic diagram of the common edge device that Fig. 6 provides for the embodiment of the invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Route learning method flow diagram when SPB net that Fig. 3 provides for the embodiment of the invention and L3VPN are interconnected, as shown in Figure 3, its concrete steps are as follows:
Step 301: when L3VPN and SPB net when interconnected, when on-premise network, edge device between SPB net and the L3VPN is deployed as: possess the PE functions of the equipments of L3VPN and the BEB functions of the equipments of SPB net simultaneously, in the present embodiment this edge device is called BEB/PE equipment.
BEB/PE equipment is integrated L3VPN function and SPB function need to realize the transparent transmission of L3VPN in the SPB net, need accomplish following two things: identification VPN instance in the SPB net, adaptive IP transmits in the SPB net.
Step 302: on BEB/PE equipment, be each a VPN instance source MAC of configuration and a gateway interface, wherein, the MAC Address of gateway interface i.e. the source MAC of this VPN instance, the corresponding relation of the I-SID of the VSI of the gateway interface IP address of the gateway interface MAC Address of the VLAN ID of configuration VPN instance sign, VPN instance, VPN instance, VPN instance and SPB net on BEB/PE equipment.
The different VPN example can dispose identical gateway interface IP address, and still, the gateway interface MAC Address of different VPN example must be different.
Disposed the corresponding relation of I-SID of sign, VLAN ID, gateway interface MAC Address, gateway interface IP address and the VSI of VPN instance, just the VPN instance of L3VPN and the VSI of SPB net can have been associated, promptly just can go up the identification VPN instance in the common edge device (BEB/PE) of SPB net.
A plurality of VPN instance can be associated with on the same VSI.As an optional mode, all VPN instance can all be associated with on the same VSI.
Step 303: for the BEB/PE equipment that is positioned at SPB virtual link (PW) two ends, the sign and the gateway interface IP address of each VPN instance of configuration SPB PW opposite end BEB/PE equipment on each BEB/PE equipment.
As shown in Figure 4, BEB1/PE1, BEB2/PE2 equipment lay respectively at the two ends of SPB PW, then on BEB1/PE1 equipment, dispose the sign and the gateway interface IP address of each VPN instance of BEB2/PE2 equipment, simultaneously the sign and the gateway interface IP address of each VPN instance of configuration BEB1/PE1 equipment on BEB2/PE2 equipment.
Step 304: for each BEB/PE equipment, this equipment is issued the gateway interface MAC Address of self each VPN instance in the SPB net, to form the forward-path of the gateway interface MAC Address of this VPN instance among the B-VLAN in the SPB net.
The formation of the forward-path of the gateway interface MAC Address of VPN instance is consistent with the clean culture B-MAC address in the SPB net, the BEB device just is calculatings that floods in the SPB net together of gateway interface MAC Address and B-MAC address, thereby forms the gateway interface MAC Address of each VPN instance and the forward-path of each B-MAC address.Particularly, each node of SPB net is mutual SPB-ISIS protocol massages on backbone links, set up ISIS neighbours according to preset rules, carry out link-state information synchronously, synchronously after, each node all has all nodal informations and link-state information in the whole network, form the public information data storehouse, each node carries out shortest path tree (SPT based on this public information data storehouse then, Shortest Path Tree) calculates, obtain the set of forward-path.
Step 305: for each VPN instance of self, arbitrary BEB/PE equipment, be made as BEB1/PE1 equipment, at self each SPB PW, construct the ARP request message respectively, the transmitting terminal MAC Address of message is the gateway interface MAC Address of this VPN instance of this equipment, the destination end MAC Address is full F, transmitting terminal IP address is the gateway interface IP address of this VPN instance of this equipment, destination end IP address is the gateway interface IP address of this VPN instance of the BEB/PE equipment of arbitrary SPB PW opposite end, VLAN ID is the VLAN ID of this VPN instance, then each message is carried out the head encapsulation of M-in-M tunnel, and each message is sent by SPB PW.
For example: if a SPB PW opposite end is a BEB2/PE2 equipment, then when the ARP request message being carried out the head encapsulation of M-in-M tunnel, the source MAC of tunnel head is the B-MAC address of BEB1/PE1 equipment, the target MAC (Media Access Control) address of tunnel head is the B-MAC address of BEB2/PE2 equipment, and the I-SID in the tunnel head is the I-SID of the VSI of this VPN instance association.
Step 306: arbitrary SPB PW opposite end BEB/PE equipment, receive this ARP request message as BEB2/PE2 equipment, after separating the M-IN-M encapsulation, find that the message internal layer is the ARP request message, then message is sent to CPU (CPU, Central Processing Unit), CPU reads the I-SID of VSI from M-in-M tunnel head, determine VPN instance sign, study ARP list item and main frame route table items according to the VLAN ID in the message.
The ARP list item comprises: VPN instance sign, IP address, MAC Address, port information, ARP index.Wherein:
VPN instance sign: determine according to the VLAN ID in the original ARP request message;
IP address: the transmitting terminal IP address of promptly original ARP request message, just the gateway interface IP address of the VPN instance of BEB1/PE1 equipment;
MAC Address: the transmitting terminal MAC Address of promptly original ARP request message, just the gateway interface MAC Address of the VPN instance of BEB1/PE1 equipment;
Port information: i.e. the ingress port information of ARP request message, with the expression of VSI sign+PW sign, the VSI sign is the I-SID in the tunnel head of ARP request message, the PW sign is promptly carried the PW sign of ARP request message;
The ARP index: i.e. the index of ARP list item, generate automatically by system, can generate successively since 1.
The main frame route table items comprises: VPN instance sign, route prefix (Prefix), next hop address (Next Hop Address), outgoing interface information, ARP index.Wherein:
The VPN instance sign is with the VPN instance sign of ARP list item;
Route prefix is with the IP address of ARP list item;
Next hop address is identical with route prefix;
Outgoing interface information: i.e. the incoming interface information of ARP request message, represent that with B-VLAN sign+port numbers the B-VLAN sign is the B-VLAN label in the tunnel head of ARP request message, port numbers is the inbound port number of ARP request message;
The ARP index is with the ARP index of ARP list item, and as seen, when the next hop address of a main frame route table items was identical with the IP address of an ARP list item, the ARP index of this two list item was identical.
For example: as shown in Figure 4, if the gateway interface IP address of VPN1 is 1.1.1.1 on the BEB1/PE1 equipment, MAC Address is 0000-1000-0001, the gateway interface IP address of VPN2 is 1.1.2.1, MAC Address is 0000-1000-0002, and VPN1, VPN2 are associated with on the VSI1, and BEB1/PE1 equipment is constructed the ARP request message respectively at VPN1, VPN2, this two message all passes through PW1, Port2 and arrives BEB2 equipment, then the BEB2 learning equipment to the ARP list item be:
Table 1BEB2/PE2 learning equipment to BEB1/PE1 equipment ARP list item BEB2/PE2 learning equipment to the main frame route table items be:
The main frame route table items of the BEB1/PE1 equipment that table 2BEB2/PE2 learning equipment arrives
Step 307:BEB2/PE2 equipment structure arp response message, the transmitting terminal MAC Address of message is the gateway interface MAC Address of this VPN instance of BEB2/PE2 equipment, the destination end MAC Address is the gateway interface MAC Address of this VPN instance of BEB1/PE1 equipment, transmitting terminal IP address is the gateway interface IP address of this VPN instance of BEB2/PE2 equipment, destination end IP address is the gateway interface IP address of this VPN instance of BEB1/PE1 equipment, be message encapsulation M-in-M tunnel head, the target MAC (Media Access Control) address of tunnel head is the B-MAC address of BEB1/PE1 equipment, the source MAC of tunnel head is the B-MAC address of BEB2/PE2 equipment, message is transmitted in the SPB net by SPB PW, finally arrives BEB1/PE1 equipment.
Step 308:BEB1/PE1 equipment receives the arp response message, after separating the M-IN-M encapsulation, find that the message internal layer is the arp response message, then message is sent to CPU, CPU determines VSI according to the I-SID in the M-in-M tunnel head, determine VPN instance sign, study ARP list item and main frame route table items according to the VLAN ID in the original arp response message.
The formation of ARP list item and main frame route table items is identical with step 306.
For example: as shown in Figure 4, if the gateway interface IP address of VPN1 is 1.1.1.2 on the BEB2/PE2 equipment, MAC Address is 0000-2000-0001, the gateway interface IP address of VPN2 is 1.1.2.2, MAC Address is 0000-2000-0002, VPN1, VPN2 are associated with on the VSI1, after BEB2/PE2 equipment receives the ARP request message at VPN1, VPN2 structure that BEB1/PE1 equipment sends, return the arp response message respectively, this two arp responses message all passes through PW1, Port1 and arrives BEB1/PE1 equipment, then the BEB1/PE1 learning equipment to the ARP list item be:
Table 3BEB1/PE1 learning equipment to BEB2/PE2 equipment ARP list item BEB1/PE1 learning equipment to the main frame route table items be:
The main frame route table items of the BEB2/PE2 equipment that table 4BEB1/PE1 learning equipment arrives
Step 309: when BEB1/PE1 equipment received routing iinformation from the CE equipment of L3VPN, this routing iinformation comprised the IP address of VPN instance sign and CE equipment, and the routing iinformation of this CE equipment is distributed to each opposite end BEB/PE equipment by each SPB PW.
In the present embodiment, between each common edge device, the VPN routing iinformation of self is announced to the bgp neighbor that comprises the opposite end common edge device, can pass through Border Gateway Protocol (BGP as BEB1/PE1, BEB2/PE2 equipment, Border Gateway Protocol) carries out the mutual of VPN routing iinformation,, so that the opposite end common edge device is created the route table items of VPN instance in view of the above.VPN routing iinformation with mutual CE equipment between the common edge device is that example describes below.
Step 310: the BEB/PE equipment of arbitrary SPB PW opposite end, receive the routing iinformation of this CE equipment as BEB2/PE2 equipment, from this routing iinformation, read the IP address of VPN instance sign and CE equipment, with the gateway interface IP address of this VPN instance of BEB1/PE1 equipment next hop address as the route of this CE equipment, in the main frame route table items of self record, find the outgoing interface information and the ARP index of correspondence according to the gateway interface IP address of this VPN instance of VPN instance sign and BEB1/PE1 equipment, learn the route table items of this CE equipment.
The route table items of CE equipment comprises: VPN instance sign, route prefix, next hop address, outgoing interface information, ARP index.Wherein:
VPN instance sign: the VPN instance sign that promptly from the routing iinformation of CE equipment, reads;
Route prefix: i.e. IP address in the routing iinformation of the CE equipment sent of BEBl/PEl equipment;
Next hop address: the gateway interface IP address of this VPN instance of BEB 1/PEl equipment;
Outgoing interface information: the i.e. outgoing interface information that in the main frame route table items of self record, finds according to the gateway interface IP address of this VPN instance of VPN instance sign and BEBl/PEl equipment of BEB2/PE2 equipment:
ARP index: the i.e. ARP index that in the main frame route table items of self record, finds according to the gateway interface IP address of this VPN instance of VPN instance sign and BEBl/PEl equipment of BEB2/PE2 equipment.
For example: as shown in Figure 4, if the IP address of the CE3 equipment in the VPNl is 3.1.1.1, CE3 equipment releases the routing iinformation of self, this routing iinformation arrives BEB2/PE2 equipment through PE3 equipment, BEB2/PE2 equipment releases the routing iinformation of CE3 equipment, this routing iinformation arrives BEBl/PEl, BEBl/PEl is with the gateway interface IP address of the VPNl of BEB2/PE2: 1.1.1.2 is as the next hop address of the route of this CE3 equipment, and according to VPNl, 1.1.1.2 search the main frame route table items, obtain outgoing interface: B-VLAN+Portl, the ARP index: 1, the route table items of then learning CE3 equipment is as follows:
The route table items of the CE3 equipment that table 5BEB1/PEl learning equipment arrives
The IP address of the CE4 equipment in the VPNl is 4.1.1.1, CE4 equipment releases the routing iinformation of self, this routing iinformation arrives BEBl/PEl equipment through PE4 equipment, BEBl/PEl equipment releases this routing iinformation, this routing iinformation arrives BEB2/PE2 equipment, BEB2/PE2 equipment is with the gateway interface IP address of the VPNl of BEBl/PEl equipment: 1.1.1.1 is as the next hop address of the route of this CE3 equipment, and according to VPNl, 1.1.1.1 search the main frame route table items, obtain outgoing interface: B-VLAN+Port2, the ARP index: 1, the route table items of then learning CE4 equipment is as follows:
The route table items of the CE4 equipment that table 6BEB2/PE2 learning equipment arrives
Message forwarding method flow chart when SPB net that Fig. 5 provides for the embodiment of the invention and L3VPN are interconnected, as shown in Figure 5, its concrete steps are as follows:
Step 501:BEB1/PE1 equipment receives the message from L3VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, purpose IP address according to message, in the route table items of the VPN instance of self record, find corresponding list item, according to the ARP list item of the ARP index search in this list item to correspondence, from the ARP list item, read the VPN instance sign, MAC Address, be two layers of head of this message encapsulation according to this ARP list item, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of BEB1/PE1 equipment, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the ARP list item, according to the outgoing interface information in the route table items of the CE equipment that finds this message is sent in the SPB net.
That is to say, edge device receives the message of target MAC (Media Access Control) address for the gateway interface MAC Address of self VPN instance, purpose IP address according to described message, the route forwarding table of coupling VPN instance, if jumping, next of the route table items on the coupling be opposite end edge device gateway interface, then further according to the IP address resolution list item of opposite end edge device gateway interface, after upgrading the ether frame head encapsulation of described message, the forward-path of MAC Address in the SPB territory by opposite end edge device gateway interface is sent to the opposite end edge device with described message.
The message that is dealt in the SPB net is not the M-in-M message, but two layers of common Ethernet message, the target MAC (Media Access Control) address of message is the gateway MAC Address of this VPN instance of the BEB2/PE2 equipment of BEB1/PE1 equipment opposite end, message forward-path according to the gateway MAC Address of this VPN instance of BEB2/PE2 equipment in SPB net is transmitted, and arrives BEB2/PE2 equipment.Wherein, the forward-path of the gateway MAC Address of this VPN instance of BEB2/PE2 equipment forms in step 304.
Step 502:BEB2/PE2 equipment receives this message from the SPB net, the target MAC (Media Access Control) address of finding message is the gateway interface MAC Address of this equipment one VPN instance, according to the purpose IP address search of message route table items, then this message is unconditionally carried out routing forwarding in this VPN instance to corresponding VPN instance.
Message carries out the process of routing forwarding in this VPN instance same as the prior art.
As shown in Figure 4, establish CE4 equipment and send the ping message, the source IP address of message is 4.1.1.1, and purpose IP address is 3.1.1.1, and promptly destination device is a CE3 equipment, and then the message repeating process is as follows:
Step 01: message arrives BEB1/PE1 equipment through L3VPN, BEB1/PE1 equipment is according to the purpose IP address of message: 3.1.1.1, find the route table items of corresponding CE3 equipment, obtain VPN instance and be designated 1, outgoing interface information is B-VLAN+Port1, the ARP index is 1, find the ARP list item of ARP index 1 correspondence, according to this ARP list item is two layers of head of message encapsulation, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the ARP list item: 0000-2000-0001, be the gateway interface MAC Address of the VPN1 of BEB2/PE2 equipment, source MAC is the gateway interface MAC Address of the VPN1 of BEB1/PE1 equipment, and message is sent in the SPB net by Port1.
When message enters the SPB net, be not the M-in-M message, but two layers of common Ethernet message, message is transmitted according to the forward-path of MAC Address: 0000-2000-0001 in the SPB net, arrives BEB2/PE2 equipment.
Step 02:BEB2/PE2 equipment receives the ping message, finds that the target MAC (Media Access Control) address of message is the gateway interface MAC Address of VPN1, and this message is unconditionally carried out routing forwarding in VPN1.
Step 03:ping message normally is forwarded to PE3 equipment in VPN1, give the CE3 equipment of hanging down by the PE3 device forwards, and CE3 equipment produces response message after receiving this message, and the purpose IP address of message is 4.1.1.1, and source IP is 3.1.1.1.
Step 04: response message enters L3VPN through PE3 equipment, arrives BEB2/PE2 equipment.
After step 05:BEB2/PE2 equipment is received response message, purpose IP address according to message: 3.1.1.1, find the route table items of corresponding CE4 equipment, obtain VPN instance and be designated 1, outgoing interface information is B-VLAN+Port2, the ARP index is 1, find the ARP list item according to ARP index 1, according to this ARP list item is two layers of head of message encapsulation, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the ARP list item: 0000-1000-0001, be the gateway interface MAC Address of the VPN1 of BEB1/PE1 equipment, source MAC is the gateway interface MAC Address of the VPN1 of BEB2/PE2 equipment, and message is sent in the SPB net by Port2.
Step 06: response message is transmitted according to the forward-path of MAC Address: 0000-1000-0001 in the SPB net, arrive BEB1/PE1 equipment, BEB1/PE1 device discovery target MAC (Media Access Control) address is the gateway interface MAC Address of VPN1, unconditionally carries out routing forwarding in VPN1.
Step 07: message normally is forwarded to PE4 equipment in VPN1, and gives the CE4 equipment of hanging down by the PE4 device forwards, thereby has finished the message interaction of CE4 equipment to CE3 equipment.
The composition schematic diagram of the common edge device that Fig. 6 provides for the embodiment of the invention, this common edge device is between SPB net and L3VPN, and possess the PE functions of the equipments of L3VPN and the BEB functions of the equipments of SPB net simultaneously, this common edge device comprises: module 61, list item study module 62 and packet forwarding module 63 are preserved in configuration, wherein:
List item study module 62: preserve the gateway interface MAC Address that module 61 is obtained each VPN instance of this common edge device from configuration, the gateway interface MAC Address of this each VPN instance is published in the SPB net, to trigger the forward-path of gateway interface MAC Address in the SPB net that generates each VPN instance; For each VPN instance, preserve the VSI sign that module 61 is obtained this VPN instance association from configuration, and the sign of each VPN instance of the common edge device of each SPB PW opposite end and gateway interface IP address, by with the IP address resolution request message of mutual each VPN instance of each opposite end common edge device, learn the IP address resolution list item and the main frame route table items of each opposite end common edge device; By the gateway interface of VPN instance and the routing iinformation of the mutual VPN routing iinformation customer edge CE equipment separately of each opposite end common edge device, create the route table items of VPN instance.For example, during the route of the CE equipment in receiving the VPN that the pair of end common edge device sends, the next hop address of the gateway interface IP address of this VPN that preserves this opposite end common edge device in the module 61 as this route will be disposed, and find the main frame route table items that mates with this VPN instance sign and next hop address, with the outgoing interface of the outgoing interface in this main frame route table items, set up the route table items of this CE equipment as the route of this CE equipment.
Wherein, list item study module 62 is when the IP address resolution list item of learning arbitrary opposite end common edge device and main frame route table items, for each VPN instance, when receiving the IP address resolution request message that arbitrary opposite end common edge device sends, the VSI sign that comprises this VPN instance association in the outer layer tunnel head of this message, transmitting terminal MAC Address in two layers of head of the internal layer of this message is the gateway interface MAC Address of this VPN instance of this opposite end common edge device, transmitting terminal IP address is the gateway interface IP address of this VPN instance of this opposite end common edge device, destination end IP address is the gateway ip address of this VPN instance of this common edge device, VLAN ID is the VLAN ID of this VPN instance, determine the VPN instance sign according to the VLAN ID in the message, study IP address resolution list item and main frame route table items, wherein:
IP address resolution list item comprises: VPN instance sign, IP address, MAC Address, port information and IP address resolution index;
The main frame route table items comprises: VPN instance sign, route prefix, next hop address, outgoing interface information and IP address resolution index;
Wherein, IP address, MAC Address: i.e. gateway interface IP address, the MAC Address of this VPN instance of opposite end common edge device;
Port information: by the PW sign expression of this message of VSI sign+carrying of this VPN instance association;
Route prefix, next hop address: i.e. the gateway interface IP address of this VPN instance of opposite end common edge device;
Outgoing interface information: by the inbound port sign expression of the B-VLAN sign+message in the IP address resolution request message;
IP address resolution list item is identical with IP address resolution index in the main frame route table items.
Packet forwarding module 63: according to the route table items of forward-path, IP address resolution list item and the described VPN instance of the gateway interface MAC Address of the VPN instance in the list item study module, to be forwarded to from the message in the VPN in the SPB net, perhaps will be forwarded among the VPN from the message of SPB net.For example, when the message that receives from VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, packet forwarding module 63 finds the route table items of corresponding VPN instance in list item study module 62 according to the purpose IP address of message, in list item study module 62, find corresponding IP address resolution list item according to sign of the VPN instance in this list item and next hop address, according to this IP address resolution list item is two layers of head of message encapsulation, wherein, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of this equipment, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the IP address resolution list item, and this message is sent in the SPB net; When receiving the message of netting from SPB,, arrive the route table items of corresponding VPN instance according to the purpose IP address search of message from if find that the target MAC (Media Access Control) address of message is the gateway interface MAC Address of this equipment one VPN instance.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. shortest path bridge SPB and layer 3 VLAN L3VPN interoperability methods, it is characterized in that, the SPB net links to each other by a common edge device with L3VPN, this common edge device is simultaneously as the backbone network edge bridges BEB equipment of SPB net and the service provider network edge PE equipment of L3VPN, on this common edge device, dispose the incidence relation of the virtual service instance VSI of VPN instance and SPB net simultaneously, wherein, each VPN instance possesses a gateway interface IP address and media interviews control MAC Address, the gateway interface MAC Address difference of different VPN example, for the common edge device that is positioned at same SPB virtual link PW two ends, the gateway interface IP address of each VPN instance of configuration opposite end common edge device on each common edge device, this method comprises:
Each common edge device is published to the gateway interface MAC Address of each VPN instance of self in the SPB net, generates the forward-path of this MAC Address in the SPB net to trigger;
For each VPN instance, common edge device is according to the gateway interface IP address of the common edge device of the incidence relation of this VPN instance and VSI and SPB PW opposite end, the IP address resolution list item and the main frame route table items of study opposite end common edge device;
Common edge device is created the route table items of VPN instance by the gateway interface of VPN instance and the routing iinformation of the mutual VPN routing iinformation customer edge CE equipment separately of each opposite end common edge device;
Common edge device is according to the route table items of forward-path, IP address resolution list item and the described VPN instance of the gateway interface MAC Address of the VPN instance of learning, to be forwarded to from the message in the VPN in the SPB net, perhaps will be forwarded among the VPN from the message of SPB net.
2. method according to claim 1 is characterized in that, the route table items of described establishment VPN instance comprises:
During VPN route in common edge device receives the VPN instance that the pair of end common edge device sends, with the gateway interface IP address of this VPN instance of opposite end common edge device next hop address as this route, and find the main frame route table items that mates with this VPN instance sign and next hop address, with the outgoing interface of the outgoing interface in this main frame route table items, set up the route table items of this VPN as this VPN route.
3. method according to claim 1 is characterized in that, the IP address resolution list item and the main frame route table items of described common edge device study opposite end common edge device comprise:
For each VPN instance, the IP address resolution request message that the common edge device of common edge device reception SPB PW opposite end is sent, the VSI sign that comprises this VPN instance association in the outer layer tunnel head of this message, transmitting terminal MAC Address in two layers of head of the internal layer of this message is the gateway interface MAC Address of this VPN instance of opposite end common edge device, transmitting terminal IP address is the gateway interface IP address of this VPN instance of opposite end common edge device, destination end IP address is the gateway ip address of this VPN instance of this common edge device, VLAN ID is the VLAN ID of this VPN instance, edge device is determined VPN instance sign, study IP address resolution list item and main frame route table items according to the VLAN ID in the message.
4. method according to claim 1 is characterized in that, described common edge device will be forwarded to from the message in the VPN in the SPB net and comprise:
Common edge device receives the message from VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, arrive the route table items of corresponding VPN instance according to the purpose IP address search of message, find corresponding IP address resolution list item according to sign of the VPN instance in this list item and next hop address, according to this IP address resolution list item is two layers of head of message encapsulation, wherein, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of this edge device, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the IP address resolution list item, and this message is sent in the SPB net.
5. method according to claim 1 is characterized in that, described common edge device will be forwarded among the VPN from the message of SPB net and comprise:
Common edge device receives the message from the SPB net, the target MAC (Media Access Control) address of finding this message is the gateway interface MAC Address of this equipment one VPN instance, according to the purpose IP address search of message route table items, this message is carried out routing forwarding in this VPN instance to corresponding VPN instance.
6. a common edge device is characterized in that, between SPB net and L3VPN, and simultaneously as the BEB equipment of SPB net and the PE equipment of L3VPN, this common edge device comprises:
Module is preserved in configuration: the incidence relation of preserving the VSI of VPN instance and SPB net, wherein, each VPN instance possesses a gateway interface IP address and MAC Address, the gateway interface MAC Address difference of different VPN example, the gateway interface IP address of each VPN instance of the common edge device of preservation SPB PW opposite end;
The list item study module: the gateway interface MAC Address that will dispose each VPN instance of preserving this equipment in the module is published in the SPB net, generates the forward-path of this MAC Address in the SPB net to trigger; For each VPN instance, preserve the gateway interface IP address of the common edge device of the incidence relation of this VPN instance and VSI in the module and SPB PW opposite end according to configuration, learn the IP address resolution list item and the main frame route table items of opposite end common edge device; By the gateway interface of VPN instance and the routing iinformation of the mutual VPN routing iinformation customer edge CE equipment separately of each opposite end common edge device, create the route table items of VPN instance;
Packet forwarding module: according to the route table items of forward-path, IP address resolution list item and the described VPN instance of the gateway interface MAC Address of the VPN instance in the list item study module, to be forwarded to from the message in the VPN in the SPB net, perhaps will be forwarded among the VPN from the message of SPB net.
7. common edge device according to claim 6, it is characterized in that, described list item study module is further used for, VPN route in the VPN instance of sending according to the opposite end common edge device, the next hop address of the gateway interface IP address of this VPN instance of preserving this opposite end common edge device in the module as this route will be disposed, and find the main frame route table items that mates with this VPN instance sign and next hop address, with the outgoing interface of the outgoing interface in this main frame route table items, set up the route table items of this VPN as this VPN route.
8. common edge device according to claim 6, it is characterized in that, described list item study module is further used for, when the IP address resolution list item of learning the opposite end common edge device and main frame route table items, for each VPN instance, when IP address resolution request message that the common edge device that receives SPB PW opposite end is sent, the VSI sign that comprises this VPN instance association in the outer layer tunnel head of this message, transmitting terminal MAC Address in two layers of head of the internal layer of this message is the gateway interface MAC Address of this VPN instance of this opposite end common edge device, transmitting terminal IP address is the gateway interface IP address of this VPN instance of this opposite end common edge device, destination end IP address is the gateway ip address of this VPN instance of this common edge device, VLAN ID is the VLAN ID of this VPN instance, determine VPN instance sign, study IP address resolution list item and main frame route table items according to the VLAN ID in the message.
9. common edge device according to claim 6, it is characterized in that, described packet forwarding module is further used for, when the message that receives from VPN, at the target MAC (Media Access Control) address of this message is that this is at one's side during the MAC Address of the gateway interface of a VPN instance, in the list item study module, find the route table items of corresponding VPN instance according to the purpose IP address of message, in the list item study module, find corresponding IP address resolution list item according to sign of the VPN instance in this list item and next hop address, according to this IP address resolution list item is two layers of head of message encapsulation, wherein, the source MAC of two layers of head is the gateway interface MAC Address of this VPN instance of this equipment, the target MAC (Media Access Control) address of two layers of head is the MAC Address in the IP address resolution list item, and this message is sent in the SPB net.
10. common edge device according to claim 6, it is characterized in that, described packet forwarding module is further used for, when receiving the message of netting from SPB, if find that the target MAC (Media Access Control) address of message is the gateway interface MAC Address of this equipment one VPN instance, according to the purpose IP address search of message route table items, this message is carried out routing forwarding in this VPN instance to corresponding VPN instance.
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