CN102739519B - Rooted multipoint service implementation method, device and system, and provider edge equipment - Google Patents
Rooted multipoint service implementation method, device and system, and provider edge equipment Download PDFInfo
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Abstract
The invention discloses a Border-Gateway-Protocol-based rooted multipoint service implementation method, device and system and a provider edge device. According to the technical scheme of the embodiments of the invention, a first PE (Provider Edge Equipment) obtains a type of an AC (Attachment Circuit) connected by a neighbor PE through received route update information, at most two pseudo wires are established between the first PE and the neighbor PE according to the type of the AC configured and connected by the first PE and the type of the AC connected by the neighbor PE; a pseudo wire is not established between the first PE and the neighbor PE when the AC connected by the first PE and the AC connected by the neighbor PE are both leaf ACs, so that communication isolation between a customer edge equipment connected by the leaf ACs can be achieved; and as the at most two pseudo wires are established between the first PE and the neighbor PE, the number of pseudo wires can be reduced, the degree of complexity for managing the pseudo wires is reduced, and thus the problems of large resource consumption and complex management on the pseudo wires in the conventional E-Tree service implemented technology can be overcome.
Description
Technical field
The present invention relates to network communication field, particularly, relate to a kind of foundation multipoint service implementation method based on Border Gateway Protocol (Border Gateway Protocol, BGP), device and system, provider edge equipment.
Background technology
At present, in order to support that enterprise is based on multiprotocol label switching (MPLS, Multi-Protocol Label Switching) and Virtual Private Network (VPN, Virtual Private Network) dispose the actual demand of data center, internet engineering task group (IETF, Internet Engineering Task Force) newly define a kind of novel two-layer virtual net L2vpn technology: foundation multiple spot technology (E-TREE, Ethernet tree).As the principle schematic that Fig. 1 is a typical E-TREE application scenarios.Provider edge equipment (PE in Fig. 1, Provider Edge) 1, PE2, PE3, PE4 belong to same Virtual Switch Instance (Virtual Forwarding Instance, VFI), be in the PE phase neighbours PE each other in same VFI, PE1 is by root access link (AC, Attachment Circuit) 1, leaf AC1 provide two layers of service for CE1 and CE2; PE2 by leaf AC2 for CE3 provides two layers of service; PE3 by leaf AC3 for CE4 provides two layers of service; PE4 by root AC2 for CE5 provides two layers of service.Customer edge devices (CE, Customer Edge) as accessed by root AC in Fig. 1 can be referred to as root node, can with all CE devices communicatings in example; The CE equipment accessed by leaf AC can be referred to as leaf node, can only with the CE devices communicating accessed by root AC in example.That is: root node CE1, CE5 with all devices communicatings, but can not be able to communicate between leaf node CE2, CE3, CE4.
Will realize above-mentioned E-TREE technology at present and have four kinds of implementations, the unofficial draft that these four kinds of IETF L2VPN working groups propose all realizes E-TREE function based on the expansion of VPLS (Virtual Private LAN Service, VPLS).In these four kinds of schemes, comprise to communicate according to pseudo-line type or according to control word to this two classes scheme that communicates; In the scheme communicated according to pseudo-line type, two pseudo-line schemes and how pseudo-line scheme can be divided into again.
One, two pseudo-line scheme: draft-ram-l2vpn-etree-multiple-pw-01 describes by tag distribution protocol (LDP, Label Distribution Protocol) signaling or Border Gateway Protocol (BGP, Border Gateway Protocol) signaling sets up two pseudo-lines at PE equipment room: one is the pseudo-line of root, the pseudo-line of root is only conveyed into the message from root node AC of PE device forwards, go out PE equipment the unknown name clean culture received from the pseudo-line of root or broadcasting packet are forwarded to all AC connected, namely forward to leaf AC and root AC; Article one, be the pseudo-line of leaf, the pseudo-line of leaf is only conveyed into the message from leaf AC of PE device forwards, goes out the root AC that the unknown name clean culture received from the pseudo-line of leaf or broadcasting packet are only transmitted to connection by PE equipment.For the E-Tree application scenarios shown in Fig. 2; PE1 accesses root AC1 and leaf AC2; root AC1 and CE1 connects; leaf AC2 and CE3 connects; PE2 accesses leaf AC1 and root AC2; leaf AC1 and CE2 connects; root AC2 and CE4 connects; PW1 is the pseudo-line of root, and PW2 is the pseudo-line of leaf, if the source address of a unknown name clean culture or broadcasting packet is CE1; then PE1 is into PE equipment for this message; PE2 is for going out PE equipment, and this message is forwarded by PW1 by PE1, and PE2 is forwarded to CE2 and CE4 after decapsulation; Similarly, source address is that the unknown name clean culture of CE2 or broadcasting packet are then forwarded to CE1 by PW2 via PE1 by PE2; Source address is that the unknown name clean culture of CE3 or broadcasting packet are then forwarded to CE4 by PW2 via PE2 by PE1; Source address is that the unknown name clean culture of CE4 or broadcasting packet are then forwarded to CE1 and CE3 by PW1 via PE1 by PE2.
Two, how pseudo-line scheme: set up pseudo-line at PE equipment room by LDP or BGP, but in VFI example, be divided into two classes according to AC type, i.e. leaf AC and root AC, the PE equipment room all having root AC and leaf AC at two like this needs to set up 3 pseudo-lines: the pseudo-line of Gen-Gen, the pseudo-line of root-leaf and pseudo-3, the line of leaf-Gen.For the E-Tree application scenarios shown in Fig. 3, PE1 accesses root AC1 and leaf AC2, root AC1 and CE1 connects, leaf AC2 and CE3 connects, PE2 accesses leaf AC1 and root AC2, leaf AC1 and CE2 connects, root AC2 and CE4 connects, 3 pseudo-lines will be set up between PE1 and PE2, PW1 is the pseudo-line of Gen-Gen, PW2 is the pseudo-line of root-leaf, PW3 is the pseudo-line of leaf-Gen, the source address of a well-known message is CE1, destination address is CE4, then PE1 is into PE equipment for this message, PE2 is for going out PE equipment, this message is forwarded by PW1 by PE1, PE2 is forwarded to CE4 after decapsulation, similarly, source address is CE2, destination address is that the message of CE1 is then forwarded to CE1 by PE2 by PW3, the message that source address is CE4, destination address is CE3 is then forwarded to CE 3 by PE2 by PW2.
Realizing E-Tree service at the above-mentioned two pseudo-lines of employing and how pseudo-line scheme is feasible technically, but, all there is the problem that pseudo-line resource consumption is large in this two schemes.Dispose in the application of data center at actual E-TREE, if all set up two pseudo-lines or how pseudo-line between PE, so for hardware resource limited device, the discrepancy number of labels of distributing for pseudo-line may be caused inadequate, thus efficient communication cannot be carried out by pseudo-line, and along with increasing of pseudo-line quantity, also correspondingly complexity can be increased to the management of pseudo-line.
Visible, in the technology that existing E-Tree service realizes, have that pseudo-line resource consumption is large, the problem of complex management.
Summary of the invention
In view of this, embodiments provide a kind of foundation multipoint service implementation method, device and system, provider edge equipment, serve that the pseudo-line resource consumption that exists in the technology realized is large, the problem of complex management in order to solve existing E-Tree.
Embodiment of the present invention technical scheme is as follows:
An implementation method for foundation multipoint service, comprising: the first provider edge equipment PE receives the routing update message that can reach message from the multi-protocols route of neighbours PE; According to the access link AC information of the neighbours PE carried in the routing update message received and the AC information of a PE that configures, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, between a PE and neighbours PE, do not set up pseudo-line; Wherein, the type information of AC that connects for PE of AC information.
An implement device for foundation multipoint service, comprising: message reception module, can reach the routing update message of message for the multi-protocols route received from neighbor operators edge device PE; Module set up by pseudo-line, for the AC information of the access link AC information of neighbours PE of carrying in the routing update message that receives according to message reception module and the device place PE configured, two pseudo-lines are set up at most between device place PE and neighbours PE, and when the AC that device place PE is connected with neighbours PE is leaf AC, between device place PE and neighbours PE, do not set up pseudo-line.
A kind of provider edge equipment, comprises the implement device of foundation multipoint service as above.
A kind of Ethernet foundation multipoint service realizes system, and comprising: at least two provider edge equipment PE as above, each PE is connected with root access link AC and/or leaf AC, and root AC or leaf AC is connected with several customer edge devices respectively.
According to the technical scheme of the embodiment of the present invention, one PE obtains the type of the AC be connected with neighbours PE by the routing update message received, according to the type of the AC that the type of the AC of the connection of self configuration is connected with neighbours, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, pseudo-line is not set up between a PE and neighbours PE, can realize like this leaf AC connect client edge equipment between communication isolating, and between a PE and neighbours PE, set up at most two bars of pseudo-lines, pseudo-line quantity can be reduced, reduce the complexity of pseudo-wire management, thus it is large to solve the pseudo-line resource consumption existed in the technology of existing E-Tree service realization, the problem of complex management.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Fig. 1 is the principle schematic of E-TREE application scenarios in prior art;
Fig. 2 is E-TREE Another Application scene schematic diagram in prior art;
Fig. 3 is E-TREE Another Application scene schematic diagram in prior art;
The workflow diagram of the implementation method of the foundation multipoint service that Fig. 4 provides for the embodiment of the present invention;
The structured flowchart of the implement device of the foundation multipoint service that Fig. 5 provides for the embodiment of the present invention;
Fig. 6 is the preferred structure block diagram of Fig. 5 shown device;
Fig. 7 is the application scenarios schematic diagram of embodiment of the present invention embody rule;
Fig. 8 is the workflow diagram of embodiment of the present invention embody rule;
Fig. 9 is another workflow diagram of embodiment of the present invention embody rule;
Figure 10 is the Another Application scene schematic diagram of embodiment of the present invention embody rule;
Figure 11 is the Another Application scene schematic diagram of embodiment of the present invention embody rule;
Figure 12 is the Another Application scene schematic diagram of embodiment of the present invention embody rule.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described, should be appreciated that embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
For existing in the technology that existing E-Tree service realizes, pseudo-line resource consumption is large, the problem of complex management.The embodiment of the present invention proposes a kind of according to multipoint service implementation, to solve this problem.
In the technical scheme that the embodiment of the present invention provides, existing two pseudo-line scheme is improved and expanded, mutually notice the type of the AC connected separately based on BGP signaling protocol between PE, after receiving the routing update message of neighbours PE, obtain the type of the AC of the neighbours PE connection of carrying in this routing update message, according to the type of the AC that the type of the AC of the connection of self configuration is connected with neighbours, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, pseudo-line is not set up between a PE and neighbours PE, can realize like this leaf AC connect client edge equipment between communication isolating, and between a PE and neighbours PE, set up at most two bars of pseudo-lines, pseudo-line quantity can be reduced, reduce the complexity of pseudo-wire management.
Below the technical scheme of the embodiment of the present invention is described in detail.
Fig. 4 shows the workflow diagram of the implementation method of the foundation multipoint service that the embodiment of the present invention provides, and the method comprises following processing procedure:
Step 41, a PE receive the routing update message that can reach message from the multi-protocols route of neighbours PE;
Preferably, before step 41 or after step 41, method also comprises: a PE can reach the AC information configuring a PE in the extended community attribute field in the routing update message of message in multi-protocols route; And the multi-protocols route carrying AC information can be reached in the routing update message of message send to neighbours PE; Wherein, the type information of the AC that AC information connects for PE, the type of the AC that PE connects comprises: PE only connects root AC, PE and only connects leaf AC, PE connection root AC and leaf AC; In addition, a PE also can reach in message the tag block size information configuring route distinguishing identifier symbol, route target, site identifier, site identity aggregate capacity, site identity side-play amount and application and arrive in multi-protocols route;
Step 42, a PE are according to the AC information of the neighbours PE carried in the routing update message received and the AC information of a PE that configures, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, between a PE and neighbours PE, do not set up pseudo-line.
Particularly, when neighbours PE is all connected root AC and leaf AC with a PE, two bars of pseudo-lines are set up between neighbours PE and a PE, article two, one in pseudo-line is the pseudo-line of root, the pseudo-line of root is for transmitting the message of the root AC connected from a PE or neighbours PE, article two, another in pseudo-line is the pseudo-line of leaf, and the pseudo-line of leaf is for transmitting the message of the leaf AC connected from a PE or neighbours PE; Except the above-mentioned situation set up two pseudo-lines and do not set up pseudo-line, other situation all only sets up a pseudo-line; Particularly, the quantity of the pseudo-line set up between a PE and neighbours PE according to the AC information of a PE and the AC information of neighbours PE is as shown in table 1.
Table 1
| Root AC | Leaf AC | Root AC and leaf AC | |
| Root AC | 1 | 1 | 1 |
| Leaf AC | 1 | 0 | 1 |
| Root AC and leaf AC | 1 | 1 | 2 |
According to the situation of the pseudo-line of above-mentioned foundation, a PE arranges the transmission of pseudo-line and receives mark, the pseudo-line arranged is sent and receives mark and sends to forwarding face, arrange the concrete condition sending and receive mark as described below.
When setting up two bars of pseudo-lines between a PE and neighbours PE, the transmission mark of pseudo-for the root in the one PE line is set to send the message from each AC be connected with a PE by the one PE, the transmission mark of pseudo-for the leaf in the one PE line is set to send the message from each leaf AC be connected with a PE, the reception mark of pseudo-for the root in the one PE line is set to E-Packet to each AC be connected with a PE and leaf AC, the reception mark of pseudo-for the leaf in PE line is set to only E-Packet to the root AC be connected with a PE; In like manner, the transmission mark of pseudo-for the root in neighbours PE line is set to send the message from each AC be connected with neighbours PE by neighbours PE, the transmission mark of pseudo-for the leaf in neighbours PE line is set to send the message from each leaf AC be connected with neighbours PE, the reception mark of pseudo-for the root in neighbours PE line is set to E-Packet to each AC be connected with neighbours PE and leaf AC, the reception mark of pseudo-for the leaf in neighbours PE line is set to only E-Packet to the root AC be connected with neighbours PE.
One bar of pseudo-line is set up between a PE and neighbours PE, and a PE only connects leaf AC and neighbours PE when connecting leaf AC and root AC, the transmission of the one PE mark is set to send the message from each AC be connected with a PE by the one PE, the reception of the one PE mark is set to E-Packet to each AC be connected with a PE, now, the transmission of neighbours PE mark is set to only send the message from the root AC be connected with neighbours PE by neighbours PE, and the reception of neighbours PE mark is set to only E-Packet to root AC by neighbours PE;
One bar of pseudo-line is set up between a PE and neighbours PE, and a PE connects leaf AC when being only connected leaf AC with root AC and neighbours PE, the transmission of the one PE mark is set to only send the message from the root AC be connected with a PE by the one PE, the reception of the one PE mark is set to only E-Packet to the root AC be connected with a PE by the one PE, now, the transmission of neighbours PE mark is set to send the message from each AC be connected with neighbours PE by neighbours PE, the reception of neighbours PE mark is set to E-Packet to each AC be connected with neighbours PE by neighbours PE,
In other situation setting up a pseudo-line, the transmission of respective PE mark is all set to send the message from each AC be connected by a PE and neighbours PE, all the reception of respective PE mark is set to E-Packet to each AC be connected.
Particularly, the concrete condition that transmission (S)/reception (R) identifies that one PE is arranged is as shown in table 2, the concrete condition that transmission (S)/reception (R) identifies that neighbours PE is arranged is as shown in table 3, wherein, A represents and sends from the message (S=A) of each AC and leaf AC or forward the message (R=A) received to each AC and leaf AC, O
rrepresent the message (S=O sent from root AC
r) or only forward the message (R=O received to root AC
r), O
lrepresent the message (S=O sent from each leaf AC
l).
In the process of subsequent communications, a PE sends according to the transmission mark of above-mentioned foundation and reception mark and receives message.
Table 2
Table 3
In addition, when the AC that a PE connects changes, i.e. new extraneous root AC or leaf AC, deletion root AC or leaf AC, to the routing update message that neighbours PE transmission multi-protocols can reach after reconfiguring AC information; Or, built vertical pseudo-line between one PE and neighbours PE, a PE receives again the routing update information from neighbours PE, according to the AC information of the AC information in the routing update information of neighbours PE with self configuration, rejudging the need of setting up pseudo-line, namely re-executing above-mentioned steps 42.
By above-mentioned processing procedure, one PE obtains the type of the AC be connected with neighbours PE by the routing update message received, according to the type of the AC that the type of the AC of the connection of self configuration is connected with neighbours, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, pseudo-line is not set up between a PE and neighbours PE, can realize like this leaf AC connect client edge equipment between communication isolating, and between a PE and neighbours PE, set up at most two bars of pseudo-lines, pseudo-line quantity can be reduced, reduce the complexity of pseudo-wire management, thus it is large to solve the pseudo-line resource consumption existed in the technology of existing E-Tree service realization, the problem of complex management.
Method shown in Fig. 4 can pass through hardware implementing, also can be realized by software program, and namely PE comprises the implement device of foundation multipoint service as shown in Figure 5.
Fig. 5 shows the structured flowchart of the implement device of the foundation multipoint service that the embodiment of the present invention provides, and as shown in Figure 5, this device comprises:
Message reception module 51, can reach the routing update message of message for the multi-protocols route received from neighbours PE;
Module 52 set up by pseudo-line, connection message receiver module 51, for the AC information of the AC information of neighbours PE of carrying in the route messages that receives according to message reception module 51 and the device place PE configured, two pseudo-lines are set up at most between PE at device place and neighbours PE, and when the AC that the PE at device place is connected with neighbours PE is leaf AC, between the PE at device place and neighbours PE, do not set up pseudo-line.Particularly, when neighbours PE is all connected root AC and leaf AC with the PE at device place, two pseudo-lines are set up between neighbours PE and the PE at device place, article two, one in pseudo-line is the pseudo-line of root, the message of the root AC that the pseudo-line of root connects for PE or the neighbours PE transmitted from device place, article two, another in pseudo-line is the pseudo-line of leaf, the message of the leaf AC that the pseudo-line of leaf connects for PE or the neighbours PE transmitted from device place; The PE setting up two pseudo-lines and device place except above-mentioned and neighbours PE does not set up except the situation of pseudo-line, and other situation all only sets up a pseudo-line.Concrete condition is see table 1.
Preferably, as shown in Figure 6, the implement device of the foundation multipoint service that the embodiment of the present invention provides, also comprise: configuration module 53, AC for connecting for device place PE configures AC information, particularly, the AC information of inking device place PE in the extended community attribute field in the routing update message of message can be reached in multi-protocols route; The tag block size information configuring route distinguishing identifier symbol, route target, site identifier, site identity aggregate capacity, site identity side-play amount and application and arrive also can be reached in message in multi-protocols route;
Message transmission module 54, is connected to configuration module 53, sends to neighbours PE for the multi-protocols route carrying the AC information that configuration module 53 configures being reached in the routing update message of message.
Forwarding arranges module 55, be connected to pseudo-line and set up module 52, for setting up two pseudo-lines between described device place PE and neighbours PE, the transmission mark of pseudo-for the root in described device place PE line is set to send the message from each AC be connected with described device place PE, the transmission mark of pseudo-for the leaf in described device place PE line is set to send the message from each leaf AC be connected with described device place PE, the reception mark of pseudo-for the root in described device place PE line is set to E-Packet to each AC be connected with described device place PE and leaf AC, the reception mark of pseudo-for the leaf in described device place PE line is set to only E-Packet to the root AC be connected with described device place PE, a pseudo-line is set up between described device place PE and neighbours PE, and described device place PE only connects leaf AC and neighbours PE when connecting leaf AC and root AC, the transmission of described device place PE mark is set to send the message from each AC be connected with described device place PE, the reception of described device place PE mark is set to E-Packet to each AC be connected with described device place PE, a pseudo-line is set up between described device place PE and neighbours PE, and described device place PE connects leaf AC when being only connected leaf AC with root AC and neighbours PE, the transmission of described device place PE mark is set to only send the message from the root AC be connected with described device place PE, the reception of described device place PE mark is set to only E-Packet to the root AC be connected with described device place PE, in other situation setting up a pseudo-line, forward and the message that the transmission of place PE mark is set to send each AC be certainly connected by module 55 is set, the reception of place PE mark is set to E-Packet to each AC be connected, concrete condition is see table 2 and table 3.
Message transmissions module 56, the transmission arranged for arranging module 55 according to forwarding identifies and receives mark and carrys out message transmission.
Device shown in Fig. 5 or Fig. 6 is in the concrete process implemented, can by the BGPd(BGP Daemon in the network equipment, Border Gateway Protocol program) module realization, by command line interface (Command Line Interface, CLI) configuration information of user is advertised to BGPd module by module, realized the function of the device shown in above-mentioned Fig. 5 or Fig. 6 by BGPd module, and realize the forwarding of message by MPLS forwarding module.
Device according to Fig. 5 or Fig. 6, also can realize the communication isolating between client edge equipment that leaf AC connects, and set up at most two bars of pseudo-lines between a PE and neighbours PE, can reduce pseudo-line quantity, reduce the complexity of pseudo-wire management.
The embodiment of the present invention additionally provides a kind of Ethernet foundation multipoint service and realizes system, this system can see system as shown in Figure 1, this system comprises: at least two PE as shown in Figure 5 or Figure 6, each PE is connected with root AC and/or leaf AC, and root AC or leaf AC is connected with several CE respectively.This system application method as shown in Figure 4 provides according to multipoint service.
Below the situation of embodiment of the present invention embody rule is described.
Scene one
The application scenarios of embodiment of the present invention embody rule as shown in Figure 7, the neighbours PE of PE1 and PE2 each other in VFI, PE1 accesses root AC1 and leaf AC2, root AC1 and CE1 connects, and leaf AC2 and CE3 connects, and PE2 accesses leaf AC1 and root AC2, leaf AC1 and CE2 connects, and root AC2 and CE4 connects.
Pseudo-line between PE1 and PE2 can be set up by PE1, also can be set up by PE2, as long as PE1 or PE2 has been configured with the AC information of self, and receive from the other side routing update message, obtain the AC information of the other side, just can by first possessing one end PE of these two AC information to set up pseudo-line.
Particularly, respectively by Fig. 8 and Fig. 9, both of these case is described below.
(1) pseudo-line is set up in the one end receiving routing update information after first configuring AC information
Fig. 8 illustrates the workflow of the embody rule of the foundation multipoint service implementation method that the embodiment of the present invention of knowing clearly provides, this processing method by be first configured with self AC information, after receive the routing update information of PE2 PE1 perform.
Step 801, PE1 configure AC information for connected AC, particularly, PE1 can reach in the route that multi-protocols route can reach message in the extended community attribute field in message and configure AC information, the bit information that extended community attribute field is detailed has been shown in table 4,0 to 3 bit is MBZ(Must BeZero), 4 to 5 bit is the AC information bit (ET) that the present invention specifies, 6th bit is control word mark (C) of definition in RFC 4761, and the 7th bit is sequence number mark (S) of definition in RFC 4761; Wherein, ET is the VPLS that the existing RFC 4761 of 00 expression defines, and ET is that 01 expression PE1 only connects leaf AC, and ET is that 02 expression PE1 only connects root AC, and ET is that 03 expression PE1 connects root AC and leaf AC.
Table 4
In addition, PE1 also can reach in message the tag block size information configuring route distinguishing identifier symbol, route target, site identifier, site identity aggregate capacity and application and arrive in multi-protocols route;
The above-mentioned multi-protocols route configured can be reached message and be kept in local chained list by step 802, PE1;
The above-mentioned multi-protocols route configured can be reached message and send to PE2 by step 803, PE1;
Step 804, PE1 are according to automatically finding to be used for identify whether to receive the routing update message that can reach message from the multi-protocols route of PE2, particularly, PE1 checks that the multi-protocols route received can reach the PE of the source address indication of the routing update message of message and self whether be in same address race (AFI Address-Family Identifier/SAFI subaddressing race identifies: 25/65), when judging to be in same address race, confirm that the multi-protocols route received can reach the routing update message of message from PE2; When receive can reach the routing update message of message from the multi-protocols route of PE2, process proceed to step 805, otherwise, process turn back to step 804;
Step 805, PE1 judge whether the ET in the routing update message received is 00 or 02, and when being judged as YES, process proceeds to step 806, otherwise process proceeds to step 807;
Step 806, PE1 and PE2 hold consultation, and calculate label and enter label, obtaining the forwarding behavior of pseudo-line, set up a pseudo-line, discrepancy label is handed down to forwarding face, and process proceeds to step 810;
Step 807, PE1 judge whether the ET in the routing update message received is 01, and when being judged as YES, process proceeds to step 808, otherwise process proceeds to step 809;
Step 808, PE1 judge whether the ET of self is 01, when being judged as YES, does not set up pseudo-line; When being judged as NO, PE1 and PE2 holds consultation, and calculates label and enters label, setting up a pseudo-line, discrepancy label is handed down to forwarding face, and process proceeds to step 810;
Step 809, PE1 judges whether the ET of self is 03, and when being judged as NO, PE1 and PE2 holds consultation, and calculates label and enters label, setting up a pseudo-line, discrepancy label is handed down to forwarding face; When being judged as YES, PE1 and PE2 holds consultation, and calculates label and enters label, setting up two pseudo-lines, and wherein one is the pseudo-line of root, and another is the pseudo-line of leaf, and discrepancy label is handed down to forwarding face, and process proceeds to step 810;
Step 810, PE1 arrange and send and receive mark, and the transmission of setting and reception mark are handed down to forwarding face, and concrete facilities is see table 2, and PE2 corresponds to the neighbours PE in table 2;
Step 811, PE1 carry out message transmission according to the reception mark arranged and transmission mark.
(2) pseudo-line is set up in the one end configuring AC information after first receiving routing update information
Fig. 9 shows another workflow of the embody rule of the foundation multipoint service implementation method that the embodiment of the present invention provides, this processing method by first receive PE1 routing update information, after be configured with the AC information of self PE2 perform.
The multi-protocols route that step 901, PE2 receive known neighbours PE1 can reach message;
Step 902, PE2 can reach message according to the route target that this multi-protocols route can reach in message to this multi-protocols route and preserve, and are saved in local remote routing table;
Step 903, PE2 search local chained list, and judging whether to have the multi-protocols route sent to PE1 can reach message, and when being judged as YES, process proceeds to step 905, and when being judged as NO, process proceeds to step 904;
Step 904, PE2 configure AC information for connected AC, and concrete configuration process is see above-mentioned steps 901;
The multi-protocols route stored in step 905, PE2 acquisition remote routing table can reach the routing update message in message, judge whether the ET in this routing update message is 00 or 02, when being judged as YES, process proceeds to step 906, otherwise process proceeds to step 907;
Step 906, PE2 and PE1 hold consultation, and calculate label and enter label, setting up a pseudo-line, discrepancy label is handed down to forwarding face, and process proceeds to step 910;
Step 907, PE2 judge whether the ET in the routing update message received is 01, and when being judged as YES, process proceeds to step 908, otherwise process proceeds to step 909;
Step 908, PE2 judge whether the ET of self is 01, when being judged as YES, does not set up pseudo-line; When being judged as NO, PE2 and PE1 holds consultation, and calculates label and enters label, setting up a pseudo-line, discrepancy label is handed down to forwarding face, and process proceeds to step 910;
Step 909, PE2 judges whether the ET of self is 03, and when being judged as NO, PE2 and PE1 holds consultation, and calculates label and enters label, setting up a pseudo-line; When being judged as YES, PE2 and PE1 holds consultation, and calculates label and enters label, setting up two pseudo-lines, and wherein one is the pseudo-line of root, and another is the pseudo-line of leaf, and discrepancy label is handed down to forwarding face, and process proceeds to step 910;
Step 910, PE2 arrange and send and receive mark, and the transmission of setting and reception mark are handed down to forwarding face, and concrete facilities is see table 3, and PE2 corresponds to the neighbours PE in table 3;
Step 911, PE2 carry out message transmission according to the reception mark arranged and transmission mark.
In the process of concrete communication, according to the transmission arranged and reception mark, message from CE1 is sent to PE2 by the pseudo-line of root, the message from CE3 is sent to PE2 by the pseudo-line of leaf, the message received is sent to CE1 and CE3 from the pseudo-line of root, the message received from the pseudo-line of leaf is sent to CE1 by PE1, and the message from CE4 is sent to PE1 by the pseudo-line of root, the message from CE2 is sent to PE1 by the pseudo-line of leaf, the message received is sent to CE2 and CE4 from the pseudo-line of root, the message received from the pseudo-line of leaf is sent to CE4 by PE2.
Scene two
Figure 10 shows another scene of embodiment of the present invention application, the neighbours PE of PE1 and PE2 each other in VFI, and PE1 accesses root AC1, and root AC1 and CE1 connects, and PE2 access leaf AC1 and root AC2, leaf AC1 and CE2 connect, and root AC2 and CE4 connects.
In scene as shown in Figure 10, also can with reference to the processing method such as shown in Fig. 8 or Fig. 9, between PE1 and PE2, a pseudo-line is set up by PE1 or PE2, in the process of concrete communication, according to the transmission arranged and reception mark, message from CE1 is sent to PE2 by pseudo-line, the message received is sent to CE1 by PE1, and the message from CE2 and CE4 is sent to PE1 by pseudo-line, the message received is sent to CE2 and CE4 by PE2.
Scene three
Figure 11 shows another scene of embodiment of the present invention application, the neighbours PE of PE1 and PE2 each other in VFI, and PE1 accesses leaf AC2, and leaf AC2 and CE3 connects, and PE2 access leaf AC1 and root AC2, leaf AC1 and CE2 connect, and root AC2 and CE4 connects.
In scene as shown in figure 11, also can with reference to the processing method such as shown in Fig. 8 or Fig. 9, between PE1 and PE2, a pseudo-line is set up by PE1 or PE2, in the process of concrete communication, according to the transmission arranged and reception mark, message from CE3 is sent to PE2 by pseudo-line, is forwarded the message received by pseudo-line to CE3 by PE1, and the message from CE4 is only sent to PE1 by pseudo-line, the message received only is sent to CE4 by PE2.
Scene four
Figure 12 shows another scene of embodiment of the present invention application, the neighbours PE of PE1 and PE2 each other in VFI, and PE1 accesses leaf AC2, and leaf AC2 and CE3 connects, and PE2 access leaf AC1, leaf AC1 and CE2 connects, and root AC2 and CE4 connects.
In scene as shown in figure 12, because PE1 with PE2 is all only connected leaf AC, therefore do not set up pseudo-line between PE1 and PE2.
Can be found out by above-mentioned application scenarios, the embodiment of the present invention can compatible existing VPLS in the concrete process implemented, effective foundation multipoint service is provided, and between neighbours PE, set up the different pseudo-line of quantity according to the type of the AC connected at two neighbours PE, and set up at most two pseudo-lines.
Compared to prior art, the technical scheme that the embodiment of the present invention provides, can the quantity of pseudo-line of less foundation, thus can save hardware resource, ensures effectively carrying out of communication, reduce the complexity of pseudo-wire management.
In sum, existing two pseudo-line scheme is improved and expanded, mutually notice the type of the AC connected separately based on BGP signaling protocol between PE, after receiving the routing update message of neighbours PE, obtain the type of the AC of the neighbours PE connection of carrying in this routing update message, according to the type of the AC that the type of the AC of the connection of self configuration is connected with neighbours, two bars of pseudo-lines are set up at most between a PE and neighbours PE, and when the AC that a PE is connected with neighbours PE is leaf AC, pseudo-line is not set up between a PE and neighbours PE, can realize like this leaf AC connect client edge equipment between communication isolating, realize foundation multipoint service, and between a PE and neighbours PE, set up at most two bars of pseudo-lines, pseudo-line quantity can be reduced, reduce the complexity of pseudo-wire management.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. an implementation method for foundation multipoint service, is characterized in that, comprising:
First provider edge equipment PE receives the routing update message that can reach message from the multi-protocols route of neighbours PE;
According to the access link AC information of the neighbours PE carried in the described routing update message received and the AC information of a PE that configures, when neighbours PE is all connected root AC and leaf AC with a PE, two bars of pseudo-lines are set up between neighbours PE and a PE, article two, one in pseudo-line is the pseudo-line of root, the pseudo-line of root is for transmitting the message of the root AC connected from a PE or neighbours PE, article two, another in pseudo-line is the pseudo-line of leaf, and the pseudo-line of leaf is for transmitting the message of the leaf AC connected from a PE or neighbours PE; And when the AC that a PE is connected with neighbours PE is leaf AC, between a PE and neighbours PE, do not set up pseudo-line; Wherein, the type information of AC that connects for PE of AC information;
Except the above-mentioned situation set up two pseudo-lines and do not set up pseudo-line, other situation all only sets up a pseudo-line.
2. method according to claim 1, is characterized in that, described method also comprises:
One PE can reach the AC information configuring a described PE in the extended community attribute field in the routing update message of message in multi-protocols route;
The routing update message that the multi-protocols route of the AC information carrying a described PE can reach message is sent to neighbours PE.
3. method according to claim 1, is characterized in that, described method also comprises:
When setting up two bars of pseudo-lines between a PE and neighbours PE, the transmission mark of pseudo-for the root in the one PE line is set to send the message from each AC be connected with a PE by the one PE, the transmission mark of pseudo-for the leaf in the one PE line is set to send the message from each leaf AC be connected with a PE, the reception mark of pseudo-for the root in the one PE line is set to E-Packet to each AC be connected with a PE and leaf AC, the reception mark of pseudo-for the leaf in PE line is set to only E-Packet to the root AC be connected with a PE;
One bar of pseudo-line is set up between a PE and neighbours PE, and a PE only connects leaf AC and neighbours PE when connecting leaf AC and root AC, the transmission of the one PE mark is set to send the message from each AC be connected with a PE by the one PE, and the reception of PE mark is set to E-Packet to each AC be connected with a PE by a PE; One bar of pseudo-line is set up between a PE and neighbours PE, and a PE connects leaf AC when being only connected leaf AC with root AC and neighbours PE, the transmission of the one PE mark is set to only send the message from the root AC be connected with a PE by the one PE, and the reception of PE mark is set to only E-Packet to the root AC be connected with a PE by a PE; In other situation setting up a pseudo-line, the transmission of PE mark is set to send the message from each AC be connected by a PE, and just the reception mark of a PE is set to E-Packet to each AC be connected;
One PE is according to the transmission mark arranged and receive mark message transmission.
4. method according to claim 2, is characterized in that, described method also comprises:
The tag block size information configuring route distinguishing identifier symbol, route target, site identifier, site identity aggregate capacity, site identity side-play amount and application and arrive can be reached in message in multi-protocols route.
5. an implement device for foundation multipoint service, is characterized in that, comprising:
Message reception module, can reach the routing update message of message for the multi-protocols route received from neighbours PE;
Module set up by pseudo-line, for according to the access link AC information of the neighbours PE carried in the described routing update message that receives and the AC information of a PE that configures, when neighbours PE is all connected root AC and leaf AC with described device place PE, two pseudo-lines are set up between neighbours PE and described device place PE, article two, one in pseudo-line is the pseudo-line of root, the pseudo-line of root is for transmitting the message of the root AC connected from described device place PE or neighbours PE, article two, another in pseudo-line is the pseudo-line of leaf, the pseudo-line of leaf is for transmitting the message of the leaf AC connected from described device place PE or neighbours PE, and when the AC that described device place PE is connected with neighbours PE is leaf AC, between described device place PE and neighbours PE, do not set up pseudo-line.
6. device according to claim 5, is characterized in that, described device, also comprises:
Configuration module, for reaching the AC information configuring described device place PE in the extended community attribute field in the routing update message of message in multi-protocols route;
Message transmission module, sends to neighbours PE for the routing update message that the multi-protocols route of the AC information carrying the configuration of described configuration module can be reached message.
7. device according to claim 5, is characterized in that, described device also comprises:
Forwarding arranges module, for setting up two pseudo-lines between described device place PE and neighbours PE, the transmission mark of pseudo-for the root in described device place PE line is set to send the message from each AC be connected with described device place PE, the transmission mark of pseudo-for the leaf in described device place PE line is set to send the message from each leaf AC be connected with described device place PE, the reception mark of pseudo-for the root in described device place PE line is set to E-Packet to each AC be connected with described device place PE and leaf AC, the reception mark of pseudo-for the leaf in described device place PE line is set to only E-Packet to the root AC be connected with described device place PE,
A pseudo-line is set up between described device place PE and neighbours PE, and described device place PE only connects leaf AC and neighbours PE when connecting leaf AC and root AC, the transmission of described device place PE mark is set to send the message from each AC be connected with described device place PE, the reception of described device place PE mark is set to E-Packet to each AC be connected with described device place PE; A pseudo-line is set up between described device place PE and neighbours PE, and described device place PE connects leaf AC when being only connected leaf AC with root AC and neighbours PE, the transmission of described device place PE mark is set to only send the message from the root AC be connected with described device place PE, the reception of described device place PE mark is set to only E-Packet to the root AC be connected with described device place PE;
In other situation setting up a pseudo-line, the transmission of described device place PE mark is set to send the message from each AC be connected, the reception of described device place PE mark is set to E-Packet to each AC be connected;
Message transmissions module, carrys out message transmission for the transmission mark and reception mark arranging module installation according to described forwarding.
8. device according to claim 6, is characterized in that, described configuration module, also for:
The tag block size information configuring route distinguishing identifier symbol, route target, site identifier, site identity aggregate capacity, site identity side-play amount and application and arrive can be reached in message in multi-protocols route.
9. a provider edge equipment, is characterized in that, comprises the implement device of the foundation multipoint service according to any one of claim 5 to 8.
10. Ethernet foundation multipoint service realizes a system, it is characterized in that, comprising:
At least two provider edge equipment PE as claimed in claim 9, each PE is connected with root access link AC and/or leaf AC, and root AC or leaf AC is connected with several customer edge devices respectively.
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| CN103095578B (en) * | 2013-01-29 | 2015-09-30 | 杭州华三通信技术有限公司 | Routing iinformation control method in MPLS L3VPN network and PE equipment |
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