CN101588520A - A kind of segment protect method that is used for the MPLS-TP network - Google Patents
A kind of segment protect method that is used for the MPLS-TP network Download PDFInfo
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- CN101588520A CN101588520A CNA200910088443XA CN200910088443A CN101588520A CN 101588520 A CN101588520 A CN 101588520A CN A200910088443X A CNA200910088443X A CN A200910088443XA CN 200910088443 A CN200910088443 A CN 200910088443A CN 101588520 A CN101588520 A CN 101588520A
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Abstract
The present invention is a kind of segment protect method that can be used for the MPLS-TP network.This method is by in conjunction with the RSVP-TE signaling, and the information of each protection section is notified to all nodes on the shielded LSP, so that after breaking down, the fault down stream node can effectively be notified to fault message the protection section starting point of guilty culprit.Then, the explicit protection routing iinformation that this is named a person for a particular job and stores according to self removes the switching services that is subjected to fault effects, to realize the protection to this fault business on the indicated protection section of explicit protection route.Adopt method of the present invention, the LSP among the MPLS-TP has been realized segment protect, can obtain lower resource occupying rate, and short protection switch time.
Description
Technical field
The present invention relates to the protection reverse method in a kind of communication network, relate in particular to the segment protect reverse method of the label switched path (LSP) in the MPLS-TP network.
Background technology
The MPLS-TP technology is the expansion of MPLS technology in transport layer, and this technology is used identical forwarding mechanism with MPLS, promptly utilizes label to realize the edge route, and core is transmitted.In the MPLS-TP network, labeled packet is transmitted along LSP, and the process of its forwarding is actual to be exactly the process of label swap operation.
Now, along with the development and the extensive use of wavelength-division multiplex technique (WDM) and photonic crystal technology, the transmission bandwidth of simple optical fiber can reach 1Tb/s.So huge bandwidth makes network to the continuity of business and the integrality of data more harsh requirement arranged.The survivability of network also just becomes one of key issue in network design and the optimization.In the MPLS-TP network, also most important to the protection of LSP.When fault has appearred in an optical fiber link, the business on this optical fiber will be switched to an other path, promptly protect the path to get on.According to the protection range in protection path, the protection exchange can be divided into path protection, three kinds of segment protect and link protections.Yet path protection needs long protection switch time; and link protection can take a large amount of Internet resources; therefore segment protect is switched more and is paid close attention to; compromise technology as path protection and link protection; it is divided into some overlapping sections or non-overlapping section with the whole piece operating path, then each section is set up the protection section respectively.For path protection, it has dwindled protection range, can effectively shorten the time that protection is switched; For link protection,, therefore significantly reduced taking to Internet resources owing to do not need all to set up the protection path for each bar link.But traditional non-overlapping segment protect can't provide the protection to intersegmental node, and the overlapping segment protect has successfully overcome this shortcoming, because the overlapping between the adjacent segment, so the fault of intersegmental node can't cause work and protection section to lose efficacy simultaneously.Guard method provided by the invention both can be used for the section that overlaps, and also can be used for non-overlapping section.
Summary of the invention
The purpose of this invention is to provide a kind of segment protect method that can be used for the MPLS-TP network.At problems of the prior art,, a kind of segment protect strategy of the MPLS-TP of being applicable to network has been proposed in conjunction with the RSVP-TE signaling.
In order to realize this purpose,, two kinds of controlling packet of MPLS-TP network segment protection have been proposed to be used for: protection section object (PSO), explicit protection route bag (PERP) according to the solution of the present invention.PSO has write down the information of protection section, is used for LSP, the protection section at its place of identification that node on the LSP can be correct, and starting point and the terminal point of protection section under understanding.PERP, by the dot generation that rises of each protection section, explicit record the routing iinformation of each protection section.
According to the solution of the present invention, a kind of segment protect method of the MPLS-TP of being used for network has been proposed.Described method mainly may further comprise the steps:
1. in the process of resource reservation, PSO is transmitted along working LSP,, make all nodes on the LSP all know the working LSP, protection section at its place and starting point and terminal point that should protection section up to the destination node place of LSP by Path message;
2. all receive the node of PSO, all the information among the PSO are recorded among the Path StateBlock separately;
3. for protection section starting point, after it receives PSO, should earlier the PSO information that receives be recorded among its Path State Block, and then, continue transmission downwards again the information that the PSO that receives is updated to this starting point place protection section;
4. after the destination node of LSP receives Path message, return Rsvp message, when the LSP source node receives this Rsvp message, not only represent finishing of resource reservation, indicate that also the information of each protection section is grasped by all nodes on the LSP fully;
5. under normal circumstances when not having fault (be LSP), PERP is kept at starting point place of each protection section always;
6. if certain section operating path breaks down, the fault down stream node will be inquired about the PSO information that writes down among the Path State Block of self, then fault message will be notified to guilty culprit protection section;
7. after this error protection section starting point has received signalling trouble; just according to the explicit route among the PERP; with transmitted along the explicit route among the PERP by the business of fault effects, when being sent to this protection segment endpoint, again along the residue operating path transmission that does not have fault.
The signaling procedure that the present invention switches protection with RSVP-TE effectively combines; make when a certain LSP in the MPLS-TP network breaks down; can realize the segment protect strategy, effectively weigh the occupancy of protection switch time and Internet resources, recover the business among the MPLS-TP.
Description of drawings
In order to be illustrated more clearly in technology proposed by the invention, will do to introduce simply to the accompanying drawing of required use in the embodiment of the invention below.
Fig. 1 is working LSP in the MPLS-TP network and the topological diagram of protecting the section path thereof;
Fig. 2 is the message format of protection section object PSO;
Fig. 3 is the message format of explicit protection route bag PERP;
Fig. 4 is that node in the MPLS-TP network is to the handling process of PSO;
After Fig. 5 is fault, the flow process of the enforcement of node protection in the MPLS-TP network.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present invention are described in detail.
Shown in Figure 1 is a LSP operating path machine upkeep section path in the MPLS-TP network, and wherein working LSP is R1 → R2 → R3 → R4 → R5 → R6 → R7 → R8 → R9, is example with overlapping segment protect mechanism here.This LSP has been divided into three active sections (WS), is respectively: and WS1 (R1 → R2 → R3 → R4), WS2 (R3 → R4 → R5 → R6 → R7), WS3 (R6 → R7 → R8 → R9).The protection section (PS) of its correspondence is respectively: and PS1 (R1 → r1 → r2 → R4), PS2 (R3 → r3 → r4 → r5 → R7), PS3 (R6 → r6 → r7 → R9).
The transmission path that includes the Path message of PSO is this working LSP (R1 → R2 → R3 → R4 → R5 → R6 → R7 → R8 → R9).
Shown in Figure 2 is, the message format of protection section object (PSO), and its structure is as follows:
● type of message: 8bit indicates the type of this controlling object;
● LSP ID:16bit, indicate operating path that this protection section protected LSP number;
● Tunnel ID:16bit, indicate operating path that this protection section protected Tunnel number;
● PS ID:8bit indicates the segment number of this protection section;
● SS:32bit, this protection section starting point is distributed to the outlet label of this working LSP;
● SD:32bit, this protection segment endpoint is distributed to the outlet label of this working LSP.
According to thought of the present invention, it is as follows to the processing procedure of PSO that this LSP goes up node:
Operating path starting point R1 is inserted into PSO in the initialized Path message, and wherein SS:R1 is the outlet label that WS1 distributes, and SD:R4 is the outlet label that WS1 distributes.PSO is along with the Path message downstream transmits.
Node on the LSP (it is outer to remove R1) when having received the Path message that contains PSO, is divided into two kinds of situations and handles:
If this node is the starting point (as R3, R6) of another active section, this node need be recorded in the PSO that receives among the Path State Block of this node so, then SS and SD field are replaced to the SS and the SD of this active section, for R3, R3 can replace to SS and SD respectively the outlet label that R3 and R7 distribute to this LSP.At last again along with the Path forwards is gone out.
If this node is not the starting point (removing R1, R3, other nodes that R6 is outer) of another active section, this node does not need to change PSO so, directly the PSO that receives is recorded among the Path State Block of this node, and then along with the Path forwards is gone out.
After the destination node R9 of LSP receives Path message, return the source node R1 that Rsvp message is given this LSP, this not only represents finishing of resource reservation, indicates that also the information of each protection section is grasped by all nodes on the LSP fully.
Shown in Figure 3 is, the message format of explicit protection route bag (PERP), and its structure is as follows:
● type of message: 8bit indicates the type of this controlling packet;
● LSP ID:16bit, indicate operating path that this protection section protected LSP number;
● Tunnel ID:16bit, indicate operating path that this protection section protected Tunnel number;
● PS ID:8bit indicates the segment number of this protection section;
● length: 8bit is the length that unit indicates whole PRO with byte;
● ERO: the routing iinformation that has write down this protection section with the form of storehouse.
R1 among Fig. 1, R3, R6 is the starting point (SS) of each protection section, all preserves the PERP of corresponding protection section among all SS.Under normal circumstances (when promptly not breaking down), PERP be kept in the protection section starting point (as R1, R3, R6).As shown in Figure 1; fault has appearred in the link between R6 and the R7; after R7 detects fault; fault message is notified to R3, the working LSP of the guilty culprit that comprises in the R3 basis fault notification that receives, the id information of Tunnel and protection section; find the pairing PERP information of this fault; R3 will be subjected to the business of fault effects to switch to protection section to get on then, and follow-up business is all according to the transmission of the protection routing iinformation among the PERP among the R3, promptly professionally transmit along R3 → r3 → r4 → r5 → R7.When business is sent to this protection segment endpoint R7, again along the residue operating path that does not have fault, i.e. R7 → R8 → R9 transmission.
Fig. 4 is example with R3; the processing procedure of node to PSO has been described; R3 receives the Path message that contains PSO; then with the PSO Message Record in the Path of R3 State Block; because R3 is starting point of next protection section, so R3 changes to the outlet label that R3 and R7 distribute to this LSP with the SS among the PSO that receives and SD field.PSO after will upgrading at last is along with the Path forwards is gone out.
Fig. 5 is example with R7; the processing procedure of R7 after the fault has been described; after R7 detects link between R6 and the R7 and fault occurred; the PSO information that writes down among R7 inquiry self the Path State Block sends to the starting point R1 of the protection section under the fault with fault message, after R1 receives this fault message; LSP in the contrast fault message; Tunnel and protection segment information find corresponding PERP, will go to R3 → r3 → r4 → r5 → R7 by the switching services of fault effects.
Claims (7)
1, a kind of segment protect method that is used for the MPLS-TP network, step comprises:
Step 1: will the section of protection object (PSO) be inserted in the Path message of RSVP-TE signaling and go, transmit along the transmission path of Path message;
After node on the LSP under the step 2:Path message receives this Path message, PSO in this Path message is saved among the Path State Block of this node and goes, judge again whether this node is protection section starting point, if, so also need to upgrade this PSO, and then transmit this Path message with the protection segment information at this node place;
Step 3: after the destination node of LSP receives Path message, return the source node that Rsvp message is given this LSP, not only represent finishing of resource reservation, indicate that also the information of each protection section is grasped by all nodes on the LSP fully;
Step 4: when breaking down, the fault down stream node is according to the PSO information that writes down in this node, fault message sent to the starting point of protection section under this fault;
Step 5: when starting point receives signalling trouble,, will on the protection section, gone by the switching services of fault effects according to explicit protection route (PERP) relevant in the starting point.
2, protection section object (PSO) according to claim 1; it is characterized in that comprising the ID of protection section; the starting point and the terminal point of protection section; and should protect affiliated working LSP of section and the ID of Tunnel; when the node on the LSP receives this protection section object, can obtain the information of this node place protection section.
3, explicit protection route bag according to claim 1 (PERP); this protection section affiliated working LSP and the ID of Tunnel have been it is characterized in that comprising; and the routing iinformation that should protect section; when protection section starting point receives fault notification; can get on by fault switching services protection section according to the protection section routing iinformation in the explicit protection route bag.
4, node according to claim 1 is preserved the PSO that receives; it is characterized in that node is saved in the PSO that receives among the Path State Block of self; when the node upstream link breaks down; this node sends in the fault notification to its protection section; include LSP and Tunnel ID among this PSO, and protection section ID.
5, protection section starting point according to claim 1 is to the renewal of PSO; it is characterized in that this starting point with the starting point of the protection section under it and the outlet label that terminal point is distributed to this LSP, replace the starting point of the last protection section among its PSO that receives and the outlet label that terminal point is distributed to this LSP.
6, according to claim 1ly judge that whether a node is the method for protection section starting point, it is characterized in that judging according to this field of the protection section starting point among the PSO that receives.
7, the switching of the protection section starting point under the fault according to claim 1 to the business that is subjected to fault effects; it is characterized in that including in the received fault notification of this protection section starting point the LSP of guilty culprit; the id information of Tunnel and protection section; contrast these information; find the PERP information of the correspondence of this node; then, follow-up business is all transmitted according to the protection routing iinformation among the PERP.
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| CNA200910088443XA CN101588520A (en) | 2009-07-07 | 2009-07-07 | A kind of segment protect method that is used for the MPLS-TP network |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011072581A1 (en) * | 2009-12-18 | 2011-06-23 | 华为技术有限公司 | Method for implementing shared mesh protection, equipment and optical network system |
| CN102833154A (en) * | 2012-07-30 | 2012-12-19 | 中国联合网络通信集团有限公司 | Node protection method based on packet transport network and system as well as node |
| WO2016197614A1 (en) * | 2015-06-12 | 2016-12-15 | 中兴通讯股份有限公司 | Method and apparatus for sending rsvp message and apparatus for receiving rsvp message |
| WO2016197881A1 (en) * | 2015-06-08 | 2016-12-15 | 华为技术有限公司 | Network protection method, network node and system |
| CN106464563A (en) * | 2014-06-24 | 2017-02-22 | 阿尔卡特朗讯 | Control of protection switching in a communication network |
| CN107979499A (en) * | 2018-01-26 | 2018-05-01 | 福州大学 | Network multipoint fault restoration methods based on stateful datum plane |
| CN108111417A (en) * | 2013-08-15 | 2018-06-01 | 华为技术有限公司 | A kind of method and device for forwarding MPLS data packets |
| CN110661700A (en) * | 2018-06-30 | 2020-01-07 | 华为技术有限公司 | Method, device and system for processing transmission path fault |
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- 2009-07-07 CN CNA200910088443XA patent/CN101588520A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011072581A1 (en) * | 2009-12-18 | 2011-06-23 | 华为技术有限公司 | Method for implementing shared mesh protection, equipment and optical network system |
| CN102104495B (en) * | 2009-12-18 | 2014-07-09 | 华为技术有限公司 | Method and equipment for realizing share Mesh protection, and optical network system |
| US9161106B2 (en) | 2009-12-18 | 2015-10-13 | Huawei Technologies Co., Ltd. | Method and device for implementing shared mesh protection and optical network system |
| CN102833154A (en) * | 2012-07-30 | 2012-12-19 | 中国联合网络通信集团有限公司 | Node protection method based on packet transport network and system as well as node |
| CN102833154B (en) * | 2012-07-30 | 2016-05-18 | 中国联合网络通信集团有限公司 | Node protection method, node and system based on packet transport network |
| CN108111417B (en) * | 2013-08-15 | 2022-12-27 | 华为技术有限公司 | Method and device for forwarding MPLS data packet |
| CN108111417A (en) * | 2013-08-15 | 2018-06-01 | 华为技术有限公司 | A kind of method and device for forwarding MPLS data packets |
| CN106464563A (en) * | 2014-06-24 | 2017-02-22 | 阿尔卡特朗讯 | Control of protection switching in a communication network |
| CN106301857A (en) * | 2015-06-08 | 2017-01-04 | 华为技术有限公司 | A kind of method of network protection, network node and system |
| WO2016197881A1 (en) * | 2015-06-08 | 2016-12-15 | 华为技术有限公司 | Network protection method, network node and system |
| CN106301857B (en) * | 2015-06-08 | 2019-10-25 | 华为技术有限公司 | A kind of method of network protection, network node and system |
| US10778570B2 (en) | 2015-06-08 | 2020-09-15 | Huawei Technologies Co., Ltd. | Network protection method, network node and system |
| WO2016197614A1 (en) * | 2015-06-12 | 2016-12-15 | 中兴通讯股份有限公司 | Method and apparatus for sending rsvp message and apparatus for receiving rsvp message |
| CN107979499A (en) * | 2018-01-26 | 2018-05-01 | 福州大学 | Network multipoint fault restoration methods based on stateful datum plane |
| CN110661700A (en) * | 2018-06-30 | 2020-01-07 | 华为技术有限公司 | Method, device and system for processing transmission path fault |
| US11888732B2 (en) | 2018-06-30 | 2024-01-30 | Huawei Technologies Co., Ltd. | Transmission path fault processing method and apparatus, and system |
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Open date: 20091125 |