CN102325042A - PE (provider edge router) and protection method of homologous homoclinic PWs (pseudo wires) - Google Patents
PE (provider edge router) and protection method of homologous homoclinic PWs (pseudo wires) Download PDFInfo
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Abstract
The invention relates to a PE (provider edge router) and a protection method of homologous homoclinic PWs (pseudo wires), the PE comprises a PW service management module, a PW OAM (operation administration and maintenance) detection module and a PW protection group module, and the method comprises the following steps: pre-binding the homologous homoclinic working PWs on the PE together and configuring OAM detection for one of the working PWs; performing periodical link detection on the working PW configured with the OAM detection after the PE works; reproducing the detection result to other working PWs which are bound to the working PW after the failure of a physical link of the physical link of the working PW or the recovery of the failure is detected; and performing switching treatment or switching-back treatment on the corresponding working PW according to the detection result. By adopting the PE and the method, the complexity in network deployment is reduced, the reliability of a network is improved; and the method is simple to the implement.
Description
Technical field
The present invention relates to the data network communications technical field, relate to the guard method of a kind of PE (Provider Edge router, backbone network edge router) and homology chummage PW (Pseudo Wire, pseudo-line) by it.
Background technology
Along with the development of data network technology, Virtual network operator tends to adopt efficiently realizes multiple service supporting with packet transmission networks cheaply, reduces the network design complexity, increases the flexibility of network service.Because the networking complexity of carrier class Ethernet is increasingly high, operator urgently hopes to reduce the complexity of network design, but can not reduce the reliability and protection performance of handoffs of network simultaneously.For guaranteeing the reliability of network, adopt OAM (Operation Administration and Maintenance, Operations,Administration And Maintenance) fault detection technique and active-standby path resist technology to improve the robustness of network.Such as, in L2VPN (Layer2Virtual Private Network, layer 2 virtual private network) network, PW OAM detection technique can fast detecting has the fault of PW; PW redundancy (pseudo-line is redundant) technology can realize accomplishing in the 50ms time to be switched, and reduces the time of professional cutout.
PW OAM detects; Mainly comprise MPLS-TP (Muti-protocol label switching-Transport Profile; Transmission subclass based on multiprotocol label switching) OAM detects; PW BFD (PWBidirectional Forwar ding Detection is based on the two-way forwarding detection of pseudo-line) etc.They all are through sending out detection messages between two equipment mutually, accomplishing the detection of link.Such as the CV message during MPLS-TP OAM is detected; For guaranteeing the performance of handoffs of PW; Sense cycle is generally acquiescence 3.33ms, if in 3.5 times of times of sense cycle, fail to receive the detection messages that sends over from far-end, thinks that then physical link breaks down.
PW redundancy (draft-ietf-pwe3-redundancy-01) is a kind of pseudo-line redundancy protecting technology.In order to adapt to the high reliability demand of carrier class Ethernet, consider the realizing route back mechanism during network design, when fault happens in operational, customer flow is switched on the protection path apace, reduce traffic loss as much as possible.
PW OAM technology is to be mutually related with PW redundancy technology, and the former mainly is responsible for link detecting, also is a vital link; The latter mainly is responsible for carrying out corresponding hand-off process according to the PW that breaks down, and the current active path of making a strategic decision instructs flow to transmit.When PW OAM detects link failure, can notify PW redundancy to carry out hand-off process, flow is switched on the protection PW fast, both complement each other, the common time that reduces professional cutout.
In one Chinese patent application CN200910118385.0, a kind of method of the PW of detection fault has been proposed.Set up in the process of PW in negotiation, through sending out protocol massages mutually, target P E judges whether to receive the protocol massages that source PE sends in the given time, detects the connectedness of PW through message switching between source PE and the target P E.
In one Chinese patent application CN200910176199.2, guard method and the device of a kind of point to multiple spot PW proposed.Confirm the switching node among the above-mentioned PW according to the PW routing table, set up main on the switching node with PW and subsequent use PW; When the master breaks down with PW, flow process is switched on the subsequent use PW by said switching node.Reduce influence of network failure on service, reduce professional disabled probability, improved professional reliability.
In sum, along with the carrier class Ethernet is increasingly high to network design and the requirement of protection performance of handoffs, guarantee again that when simplifying network design PW reaches 50ms level protection switching performance else.This just needs other OAM of Millisecond to detect, and detecting with MPLS-TP OAM is example, generally adopts the 3.33ms sense cycle just can guarantee the performance of handoffs of PW.As shown in Figure 1, be existing homology chummage network design sketch map, PE1 is to there being n bar PW between the PE2, every PW has all disposed the OAM detection, when PW more for a long time, will have following three problems:
Problem one: the PW OAM quantity of deployment is more, increases the complexity of OAM configuration, is not easy to network design and waste system resource;
Problem two: PE need handle a large amount of OAM messages, can cause PE busy, thereby make PE have performance bottleneck;
Problem three: the OAM message processing speed possibly occur and not reach inbound pacing; Cause receiving queue full, follow-up OAM message can be dropped, if MPLS-TP OAM is not received detection messages at 3.5 doubling times in the time; Then think link occurs fault, thereby causing that OAM detects produces wrong report.
Summary of the invention
The objective of the invention is, the guard method of a kind of PE and homology chummage PW is provided, to improve network design complicacy in the prior art, the problem that reliability is low.
The invention provides the guard method of a kind of homology chummage PW, said method binds together the work PW of the last homology chummage of PE in advance, and is that one of them work PW configuration OAM detects;
After the above-mentioned PE work, the work PW that the above-mentioned OAM of disposing is detected carries out the periodicity link detecting;
After the physical link that detects above-mentioned work PW breaks down perhaps physical link fault recovery, above-mentioned testing result is bred all the other work PW that bind with above-mentioned work PW;
Corresponding work PW is carried out hand-off process or return and to cut processing according to testing result.
Preferably, the above-mentioned work PW that PE is gone up the homology chummage binds together step and is specially:
For the work PW of homology chummage generates a PW LIST (Pseudo Wire List, pseudo-line group) instance;
The work PW of above-mentioned homology chummage is brought in the above-mentioned PW LIST instance and binds.
Preferably, the above-mentioned work PW that PE is gone up the homology chummage binds together step and also comprises:
One among the above-mentioned work PW that binds together work PW is configured to main PW, and all the other work PW are configured to from PW.
Preferably, above-mentioned for one of them work PW configuration OAM detects in the step, above-mentioned work PW is main PW.
Preferably, above-mentioned PE confirms that through judging whether opposite end PE returns the mode of detection messages in Preset Time the work PW that detects is that physical link breaks down or the physical link fault recovery.
Preferably, above-mentioned hand-off process is specially: the flow on the PW that will work switches on the related protection PW;
Cut for above-mentioned time to handle and be specially: will protect flow on the PW to return and switch on the corresponding work PW.
The present invention further provides a kind of PE, comprises PW service management module, PW OAM detection module and PW protection pack module,
Above-mentioned PW service management module; Be used for the work PW of the last homology chummage of above-mentioned PE is bound together; And be that one of them work PW disposes OAM detection; Perhaps when receiving the testing result of the work PW that the above-mentioned OAM of disposing detects, notify above-mentioned PW protection pack module that above-mentioned PW is carried out hand-off process or return and cut processing, simultaneously above-mentioned testing result is bred all the other work PW that the work PW that detects with the above-mentioned OAM of disposing binds; After breeding is accomplished, notify above-mentioned PW protection pack module that corresponding PW is carried out hand-off process or return and cut processing;
Above-mentioned PW OAM detection module; Be used to the work PW that disposes the OAM detection and carry out link detecting; And when the physical link that detects above-mentioned work PW breaks down perhaps physical link fault recovery, above-mentioned testing result is sent to above-mentioned PW service management module;
Above-mentioned PW protection pack module is used for after notified, and corresponding PW is carried out hand-off process or returns and cut processing.
Preferably, above-mentioned PW service management module is used to generate PW LIST instance, and the work PW that above-mentioned PE is gone up the homology chummage brings in the same PW LIST instance and binding, and one of them work PW is configured to main PW, and remaining work PW is configured to from PW.
Preferably, above-mentioned PW service management module is used to above-mentioned main PW configuration OAM and detects;
Above-mentioned PW OAM detection module is used for confirming that through judging whether opposite end PE returns detection messages in Preset Time the work PW that detects is that physical link breaks down or the physical link fault recovery.
The present invention adopts the mode of PW LIST that they are bundled into a group to the PW of homology chummage, and only on the main PW of this group, launches a PW OAM and detect, and has significantly reduced the deployment that PW OAM detects, and has reduced the complexity of network; When link failure or link-recovery take place in main PW; Its testing result is bred all from PW; Reached at each PW and all carried out the effect that OAM detects, when having improved the reliability of whole network, significantly reduced detection messages and reduced alternately; Saved message and handled resource, also reduced OAM and detected the probability of reporting by mistake.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes a part of the present invention, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, does not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is existing homology chummage network design sketch map;
Fig. 2 is the flow chart of the guard method preferred embodiment of homology chummage PW of the present invention;
Fig. 3 is the preferred embodiment theory diagram of PE of the present invention;
Fig. 4 is the network design sketch map of an application scenarios of the present invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 2, be the flow chart of the guard method preferred embodiment of homology chummage PW of the present invention; May further comprise the steps:
Step S001: bind step: generate a PW LIST instance, the work PW that PE is gone up the homology chummage brings in the above-mentioned PW LIST instance and binds;
Like this, the PW of homology chummage is and brings in the PW LIST group.
Step S002: configuration step: one in above-mentioned PW LIST instance work PW is configured to main PW, and all the other work PW are configured to from PW, and are that above-mentioned main PW configuration OAM detects;
This step promptly forms PW LIST master slave relation, and only disposes an OAM and detect.
Step S001 and S002 are preparation process of the present invention.
Step S003: detect step: behind the service operation, begin main PW is carried out periodicity link detecting, when detecting main PW physical link and break down perhaps physical link fault recovery, execution in step S004;
In order to guarantee the PW performance of handoffs; Sense cycle generally is configured to 3.33ms; Send out the OAM detection messages between source PE and the purpose PE mutually; Source PE confirms that through judging whether in 3.5 cycle times ((3.33*3.5) ms just), to receive the OAM detection messages of purpose PE this link breaks down or fault recovery.
Step S004: propagation steps:, testing result is bred all from PW according to the master slave relation in the PW LIST instance of safeguarding;
So far, the testing result of main PW has been passed to all from PW, and all PW in the PW LIST instance have all known testing result.
Step S005: protection step:, corresponding PW is carried out hand-off process or returns and to cut processing according to testing result.
In this step, if testing result is PW physical link fault, then carry out hand-off process, the flow on the PW that is about to work is switched on the related protection PW; If testing result is recovered for the PW physical link, then carry out back and cut processing, be about to protect the flow on the PW to return on the work PW that switches to separately.
As shown in Figure 3, be the preferred embodiment theory diagram of PE of the present invention, comprise PW service management module 01, PW OAM detection module 02 and PW protection pack module 03,
PW service management module 01; Be used to generate PW LIST instance; The work PW that above-mentioned PE is gone up the homology chummage brings in the same PW LIST instance and binds; One in above-mentioned PW LIST instance work PW is configured to main PW, remaining work PW is configured to from PW, and be that above-mentioned main PW configuration OAM detects; Perhaps be used for when receiving the testing result of main PW; 03 couple of above-mentioned main PW of notice PW protection pack module carries out hand-off process or returns and cut processing; Simultaneously with above-mentioned testing result breed in the above-mentioned PW LIST instance from PW; After breeding was accomplished, 03 pair of notice PW protection pack module is above-mentioned to carry out hand-off process or returns and cut processing from PW;
PW OAM detection module 02; Be used to detect the physical link of main PW; And through judging whether opposite end PE returns detection messages in Preset Time; Confirm that the work PW that detects is that physical link breaks down or the physical link fault recovery, when detecting the recovery of physical link fault or physical link, above-mentioned testing result is sent to PW service management module 01 simultaneously;
PW protects pack module 03, is used for after notified, and corresponding PW is carried out hand-off process or returns and cut processing.
As shown in Figure 4, be the network design sketch map of an application scenarios of the present invention, in the present embodiment, it is professional to suppose to have disposed between PE1 and the PE2 3 common VLL; Be respectively VLL1, VLL2, VLL3, formed PW1, PW2, three work of PW3 PW respectively, these three work PW are homology chummage PW, between PE1 and PE3, set up PW1 ' simultaneously; PW2 ', PW3 ', configuration PW protection group on PE1; And dispose to switch back and cut strategy, forming the protection relation of PW1/PW1 ', PW2/PW2 ', PW3/PW3 ', PW1, PW2, PW3 are bundled in the PW LIST instance; And PW1 is configured to main PW, and disposes OAM and detect, and PW2, PW3 are configured to from PW.
After PW OAM detected and disposes, the PW OAM detection module 02 of PE1 can realize that for PW1 normal OAM detects, and promptly MPLS-TP OAM can perceive PW1 fault generating and fault recovery.
Behind the service operation; 02 couple of PW1 of PW OAM detection module carries out the periodicity link detecting; When the physical link between the PE1-PE2 broke down perhaps physical link fault recovery, then PW OAM detection module 02 can be announced the OAM testing result of PW1 to local PW service management module 01;
After PW service management module 01 was received the testing result of PW1, one side was notified 03 couple of PW1 of local PW protection pack module to switch or is returned and cut processing; According to the master slave relation in the PW LIST instance of safeguarding, the testing result of PW1 is bred from PW2 on the other hand, PW3 is last, after breeding is accomplished, notifies local PW service management module 01 couple of PW2, PW3 to switch or returns and cut processing;
PW protection pack module 03 receive to PW1 switch or return cut the notice of processing after, begin PW1 is switched or returns and cut processing, even above-mentioned notice is a switching notice, then the flow on the PW1 is switched on the PW1 '; If above-mentioned notice is back to cut notice, then the flow on the PW1 ' returned and switch on the PW1;
PW protection pack module 03 receive to PW2, PW3 switch or return cut the notice of processing after; Begin PW2, PW3 are switched or return and to cut processing; Even above-mentioned notice is a switching notice, then PW2, the last flow of PW3 is switched to respectively on PW2 ', the PW3 '; If above-mentioned notice is back to cut notice, then the flow on PW2 ', the PW3 ' returned respectively and switch to PW2, PW3 is last;
Can find out that a present invention only work PW deploy PW OAM detects, and can accomplish the hand-off process of all PW flows in the whole PW LIST instance.
Above-mentioned explanation illustrates and has described the preferred embodiments of the present invention; But as before above-mentioned; Be to be understood that the present invention is not limited to the form that this paper discloses, should do not regard eliminating as, and can be used for various other combinations, modification and environment other embodiment; And can in this paper foregoing invention contemplated scope, change through the technology or the knowledge of above-mentioned instruction or association area.And change that those skilled in the art carried out and variation do not break away from the spirit and scope of the present invention, then all should be in the protection range of accompanying claims of the present invention.
Claims (9)
1. the guard method of the pseudo-line PW of a homology chummage is characterized in that, said method binds together the work PW that backbone network edge router PE goes up the homology chummage in advance, and for one of them work PW configuring operation management with safeguard the OAM detection;
After the said PE work, the work PW that the said OAM of disposing is detected carries out the periodicity link detecting;
After the physical link that detects said work PW breaks down perhaps physical link fault recovery, said testing result is bred all the other work PW that bind with said work PW;
Corresponding work PW is carried out hand-off process or return and to cut processing according to testing result.
2. method according to claim 1 is characterized in that, said work PW with the last homology chummage of PE binds together step and is specially:
For the work PW of homology chummage generates a pseudo-line group PW LIST instance;
The work PW of said homology chummage is brought in the said PW LIST instance and binds.
3. method according to claim 1 and 2 is characterized in that, said work PW with the last homology chummage of PE binds together step and also comprises:
One among the said work PW that binds together work PW is configured to main PW, and all the other work PW are configured to from PW.
4. according to claim 1 or 3 described methods, it is characterized in that said for one of them work PW configuration OAM detects in the step, said work PW is main PW.
5. method according to claim 1 is characterized in that, said PE confirms that through judging whether opposite end PE returns the mode of detection messages in Preset Time the work PW that detects is that physical link breaks down or the physical link fault recovery.
6. method according to claim 1 is characterized in that, said hand-off process is specially: the flow on the PW that will work switches on the related protection PW;
Cut for said time to handle and be specially: will protect flow on the PW to return and switch on the corresponding work PW.
7. a PE is characterized in that, comprises PW service management module, PW OAM detection module and PW protection pack module,
Said PW service management module; Be used for the work PW of the last homology chummage of said PE is bound together; And be that one of them work PW disposes OAM detection; Perhaps when receiving the testing result of the work PW that the said OAM of disposing detects, notify said PW protection pack module that said PW is carried out hand-off process or return and cut processing, simultaneously said testing result is bred all the other work PW that the work PW that detects with the said OAM of disposing binds; After breeding is accomplished, notify said PW protection pack module that corresponding PW is carried out hand-off process or return and cut processing;
Said PW OAM detection module; Be used to the work PW that disposes the OAM detection and carry out link detecting; And when the physical link that detects said work PW breaks down perhaps physical link fault recovery, said testing result is sent to said PW service management module;
Said PW protection pack module is used for after notified, and corresponding PW is carried out hand-off process or returns and cut processing.
8. PE according to claim 7; It is characterized in that; Said PW service management module is used to generate PW LIST instance, and the work PW that said PE is gone up the homology chummage brings in the same PWLIST instance and binding; And with one of them work PW be configured to main PW, with remaining work PW be configured to from PW.
9. according to claim 7 or 8 described PE, it is characterized in that said PW service management module is used to said main PW configuration OAM and detects;
Said PW OAM detection module is used for confirming that through judging whether opposite end PE returns detection messages in Preset Time the work PW that detects is that physical link breaks down or the physical link fault recovery.
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| CN103516534A (en) * | 2012-06-25 | 2014-01-15 | 中兴通讯股份有限公司 | Method for realizing dual-homing protection switching, and home node |
| CN104883276A (en) * | 2015-05-25 | 2015-09-02 | 烽火通信科技股份有限公司 | OAM (Operation Administration and Maintenance) method and system based on distributed architecture |
| CN105591891A (en) * | 2015-09-09 | 2016-05-18 | 杭州华三通信技术有限公司 | Pseudowire (PW) switching method and device |
| CN106385373A (en) * | 2015-07-27 | 2017-02-08 | 中兴通讯股份有限公司 | Flow transmission method and apparatus thereof |
| CN109756420A (en) * | 2017-11-07 | 2019-05-14 | 中兴通讯股份有限公司 | Detection method, storage medium and processor |
| CN113726645A (en) * | 2021-08-06 | 2021-11-30 | 中盈优创资讯科技有限公司 | STN network link-supplementing service switching method and device |
| CN115314365A (en) * | 2022-07-05 | 2022-11-08 | 杭州云合智网技术有限公司 | Fast switching method for single protection group set |
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| CN113726645A (en) * | 2021-08-06 | 2021-11-30 | 中盈优创资讯科技有限公司 | STN network link-supplementing service switching method and device |
| CN115314365A (en) * | 2022-07-05 | 2022-11-08 | 杭州云合智网技术有限公司 | Fast switching method for single protection group set |
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Application publication date: 20120118 |