CN1145333C - Fast protecting switching method for multi-protocol label exchange - Google Patents
Fast protecting switching method for multi-protocol label exchange Download PDFInfo
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- CN1145333C CN1145333C CNB011295619A CN01129561A CN1145333C CN 1145333 C CN1145333 C CN 1145333C CN B011295619 A CNB011295619 A CN B011295619A CN 01129561 A CN01129561 A CN 01129561A CN 1145333 C CN1145333 C CN 1145333C
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Abstract
The present invention relates to a fast protecting and changeover method for multiprotocol label exchange. The present invention comprises that a protecting link having the same starting point and end point as a protected link is established, a protecting label exchanging path is established along the protecting link; the port of the protected link detects the fault of the protected link; when the fault is detected, after data adds the marking of the label exchanging path, the data is returned to the port sending the information, the port sending the information is retransmitted to a router for positioning a fault port by the protecting link, and then, the data is retransmitted to the fault port by top layer label exchange. The present invention tinily occupies system capacity, and is not only limited to be applied on a specific physical layer.
Description
Technical field
The present invention relates to the network protection of data communication, specifically a kind of fast protecting switching method for multi-protocol label exchange.
Background technology
In data communication, a basic demand of IP network is reliable and stable, and this requires the network equipment that the certain protection function can be provided, and will have failover capability at network when local fault occurring, and can accomplish not interrupt as far as possible user service flow.Traditional resist technology can be divided into physical layer, link layer and IP (network) layer three class by residing protocol hierarchy.Chinese patent application CN 1230065A discloses a kind of method that realizes quick protective switch, as shown in Figure 1.In Fig. 1, each SDH network element A, B, C, D are according to the protected mode of its professional upper and lower relation and loop, cross-connect matrix control data under automatic generation operate as normal and the various protected mode also leaves in the cross-connect matrix control store district that reserves in each network element, when various fault takes place loop, carry out following steps: each SDH network element is determined its position with respect to the fault point separately; Main control unit in each SDH network element issues with respect to residing position, fault point according to it and switches order; Each described network element is carried out and is switched order, and the cross-connect matrix control data under its operate as normal is replaced by cross-connect matrix control data under the corresponding protected mode.The shortcoming of the method is in cross-connect matrix control store district; store the cross-connect matrix control data under all operate as normal and the various protected mode; no matter the cross-connect matrix control data under any protected mode is not preserved; the capital causes can't effectively protecting when this fault takes place, and therefore has the big shortcoming of the power system capacity of taking.In addition, the method can only be used on specific physical layer, in case topology of networks changes, then need regenerate new cross-connect matrix control data.
Summary of the invention
The object of the present invention is to provide a kind of fast protecting switching method for multi-protocol label exchange; it does not need to store the protected data that is connected under a large amount of various failure conditions and the various protected modes; take power system capacity minimumly; and be not only limited on the specific physical layer and use; even topology of networks changes, still can implement protection effectively.
For achieving the above object, solution of the present invention is: a kind of fast protecting switching method for multi-protocol label exchange, it comprises
A, set up a starting point and an identical protection link of terminal point with protected link, along protection link establishment protection label switched path;
The port of b, protected link carries out fault detect to protected link;
C, when step b detects fault; the data that mail to this non-working port are added return the port that sends these data behind the label switched path mark; by the port that sends these data data are forwarded to the router at non-working port place by protecting link, forward the data to this non-working port by the top-level tab exchange then.
In step a, set up the protection label switched path respectively along the both forward and reverse directions of protection link.
In step b; can carry out fault detect by such mode: the physical chip of the port of described protected link is detection port speed voluntarily; and the standard value of this speed and setting compared; in case this speed is lower than the standard value of setting; central processing unit to this port of control sends alarm signal, with this protected link is carried out fault detect.
In step b; also can carry out fault detect by such mode: protected link is to connect with the ppp link layer protocol; the port that sends these data sends an Echo-Request message to the port that receives these data by certain time interval; the port that receives these data receives behind the Echo-Request message to the Echo-Reply message of port loopback that sends these data; whether the port that sends these data receives the Echo-Reply message by detection is judged whether protected link breaks down; receive this message and judge that then protected link does not break down, do not receive this message and then judge protected link occurs fault.
In step a; before setting up the protection label switched path; be the protection label switched path configuration protection label of being set up, this protection label contains from which port of the router that sends these data which other router to be relayed to the information which bar protection label switched path arrives which port of the router that receives these data via.In step c; with the data that mail to this non-working port add return the port that sends these data behind the label switched path mark after; the central processing unit that sends the port of these data is discerned the information that this protection label carries; the information of carrying according to this protection label sends to data the router of non-working port by label switched path; carry out the exchange of top-level tab at the router of non-working port; the target port information of protection label is removed, be exchanged into the information of this non-working port.
Because fast protecting switching method for multi-protocol label exchange of the present invention is at link; it is all to set up a protection link for the protected link of each bar; in case protected link detecting is out of order; at once data are added the label switched path mark; be forwarded to the router at non-working port place by the protection link; forward the data to this non-working port by the top-level tab exchange; this detection does not rely on the topological relation of network and the fault state of other links; therefore; it does not need to store the protected data that is connected under a large amount of various failure conditions and the various protected modes; thereby minimum the power system capacity that taken; and because it does not rely on the topological relation of network; therefore it is not only limited on the specific physical layer and uses, even topology of networks changes, still can implement protection effectively.
Description of drawings
Fig. 1 is the schematic diagram that the existing techniques in realizing network protection is switched.
Fig. 2 is the flow chart of fast protecting switching method for multi-protocol label exchange of the present invention.
Fig. 3 is a multiprotocol label switching quick protective switch schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 2 is the flow chart of fast protecting switching method for multi-protocol label exchange of the present invention, can see that in Fig. 2 performing step of the present invention is as follows.
(1) sets up a starting point and an identical protection link of terminal point with protected link, along protection link establishment protection label switched path.
The present invention be directed to the link that the concrete needs of each bar protect and all set up a protection link.Itself can not be new for this protection link; but just existed in the past; only transmit data between other router; again through L3 arrive C4 port through L2 through other routers as the C3 port among Fig. 3; this link transmits the data that are switched to this link after the data of normal transmission and the protected link occurs fault simultaneously after being set up the protection link.
Each bar protection label switched path correspondence a protection label.This protection label disposed before setting up the protection label switched path.This protection label contains from which port of the router that sends these data which other router to be relayed to the information which bar protection label switched path arrives which port of the router that receives these data via.
For the method for the protection label switched path configuration protection label set up is register of configuration; write from which port of the router that sends these data to arrive the information of which port of the router that receives these data via which bar protection label switched path of which other router transfer by the central processing unit of this port that breaks down to this register, just the path according to this information switches to the protection link when passage described later switches.
Because the protection label switched path is unidirectional, need distinguish the configuration protection label switched path on both direction.Every protected link all needs to dispose two protection label switched paths.
In order to make the protection label switched path prolong that the protection path is set up and can configured bandwidth and protection policing parameter such as service quality registration, the foundation of protection label switched path need be used the CR-LDP signaling.
(2) port of protected link carries out fault detect to protected link.
Protected link is carried out fault detect two kinds of optional methods is arranged substantially:
First method is the physical chip detection port speed voluntarily of the port of protected link; and the standard value of this speed and setting compared; in case this speed is lower than the standard value of setting; central processing unit to this port of control sends alarm signal, with this protected link is carried out fault detect.The function that physical layers such as present POS and Ethernet mostly have break-make to detect.
Situation when second method generally is only limited to POS mouth use ppp link layer protocol.This situation can detect link failure at link layer.PPP connects after the foundation, and the LCP part in the ppp protocol can realize the function that connectivity detects.Direction the opposing party that PPP connects sends the Echo-Request message by certain time interval, and the opposing party must respond an Echo-Reply message after receiving Echo-Request.Send Echo-Request one square tube and cross the break-make situation that Echo-Reply just can judge connection that whether receives.Just can judge the link fault-free if receive Echo-Reply, just not think that fault has taken place link if receive Echo-Reply.
All these detection methods all can be realized the fault detection mechanism of MPLS quick protective switch, make to support the port of MPLS quick protective switch can detect link failure rapidly.
(3) when previous step detects fault suddenly, to handle more than fault not being reported to the IP layer, the IP layer mails to data the port of link failure as usual.The data that this non-working port will mail to this non-working port are returned the port that sends these data after adding the label switched path mark; the central processing unit that sends the port of these data is discerned the information that this protection label carries; the information of carrying according to this protection label sends to data the router of non-working port by label switched path; carry out the exchange of top-level tab at the router of non-working port; the target port information of protection label is removed, be exchanged into the information of this non-working port.
If protected link breaks down once more, at this moment be impossible implement effectively protection.Be switched to behind the protection label switched path again from another one faulty link protection label switched path loopback for fear of the data of a faulty link; router want can the identification protecting label switched path with the data and the normal data of difference protection passage; the data of protection passage can not be carried out second protection, abandon on faulty link.
Below we give one example and describe implementation procedure of the present invention in detail.As shown in Figure 3.Suppose that protected link is L1, the router at two ends is respectively R1, R2, and two ports are respectively C1, C2.The data flow that outputs to L1 from C1, C2 is respectively C1, C2 downstream data flow, from L1 to C1, the data flow of C2 is respectively C1, C2 upstream.The C1 downstream data flow becomes the C2 upstream by L1 arrival C2 under the normal condition.
At first, protected link L1 arrives C4 to L3 according to the present invention to L2 to other routers for setting up a starting point and the identical protection link of terminal point a: C1 with protected link.Along this protection link establishment protection label switched path.Before setting up this protection label switched path, to dispose a protection label, generally dispose by a register.Write the information that via any bar protection label switched path of which other router transfer arrives which port of the router that receives these data from which port of the router that sends these data to this register by the central processing unit of this port that breaks down; in case L1 link occurs fault just in this example; to this register write by the C3 port via L2 via other routers again via L3 at last to the routing information of port C4, when passage described later switches, just switch to this path according to this information.
When the L1 link occurs fault; port C1, C2 enter the loopback guard mode; the C1 downstream data flow is looped back to C1 after carrying out adding the encapsulation of label switched path mark when link layer packaging is handled up; the up arrival router of C1 R1; begin to judge the content of protection label by the central processing unit of router R1; read the routing information of described register, in this example promptly by the C3 port via L2 via other routers again via L3 at last to the routing information of port C4.Router R1 is forwarded to port C4 that other routers through link L3 arrive router R2 again with message by link L2 from port C3 by the protection label switched path.
Arrive the port C4 of router R2 when shielded message after, message is forwarded to port C2 by switching network by the top-level tab exchange.The information that target port is arranged in top-level tab, in this process, as long as the target port information that should reality arrives is removed, the information that is exchanged into this non-working port is just passable.Port C2 is forwarded to the up of C2 to message under the loopback guard mode then, and is so just the same with the normal message that arrives.
If L1 is because behind the disconnected fine protected loopback, take place disconnected finely once more at L2 or L3 or other links, need abandon all protected messages.
Claims (7)
1, a kind of fast protecting switching method for multi-protocol label exchange, it comprises:
A, set up a starting point and an identical protection link of terminal point with protected link, along protection link establishment protection label switched path;
The port of b, protected link carries out fault detect to protected link;
C, when step b detects fault; the data that mail to this non-working port are added return the port that sends these data behind the label switched path mark; by the port that sends these data data are forwarded to the router at non-working port place by protecting link, forward the data to this non-working port by the top-level tab exchange then.
2, fast protecting switching method for multi-protocol label exchange according to claim 1 is characterized in that: in step a, set up the protection label switched path respectively along the both forward and reverse directions of protection link.
3, fast protecting switching method for multi-protocol label exchange according to claim 1; it is characterized in that: in step b; the physical chip of the port of described protected link is detection port speed voluntarily; and the standard value of this speed and setting compared; in case this speed is lower than the standard value of setting; central processing unit to this port of control sends alarm signal, with this protected link is carried out fault detect.
4; fast protecting switching method for multi-protocol label exchange according to claim 1; it is characterized in that: in step b; protected link is to connect with the ppp link layer protocol; the port that sends these data sends an Echo-Request message to the port that receives these data by certain time interval; the port that receives these data receives behind the Echo-Request message to the Echo-Reply message of port loopback that sends these data; whether the port that sends these data receives the Echo-Reply message by detection is judged whether protected link breaks down; receive this message and judge that then protected link does not break down, do not receive this message and then judge protected link occurs fault.
5, fast protecting switching method for multi-protocol label exchange according to claim 1; it is characterized in that: in step a; before setting up the protection label switched path; be the protection label switched path configuration protection label of being set up, this protection label contains from which port of the router that sends these data which other router to be relayed to the information which bar protection label switched path arrives which port of the router that receives these data via.
6; fast protecting switching method for multi-protocol label exchange according to claim 5; it is characterized in that: in step c; with the data that mail to this non-working port add return the port that sends these data behind the label switched path mark after; the central processing unit that sends the port of these data is discerned the information that this protection label carries; the information of carrying according to this protection label sends to data the router of non-working port by label switched path; carry out the exchange of top-level tab at the router of non-working port; the target port information of protection label is removed, be exchanged into the information of this non-working port.
7, fast protecting switching method for multi-protocol label exchange according to claim 6; it is characterized in that: in step a; for the method for the protection label switched path configuration protection label set up is register of configuration, write the information that via any bar protection label switched path of which other router transfer arrives which port of the router that receives these data from which port of the router that sends these data to this register by the central processing unit of this port that breaks down.
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| CNB011295619A CN1145333C (en) | 2001-06-27 | 2001-06-27 | Fast protecting switching method for multi-protocol label exchange |
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| CNB011295619A CN1145333C (en) | 2001-06-27 | 2001-06-27 | Fast protecting switching method for multi-protocol label exchange |
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| CN1145333C true CN1145333C (en) | 2004-04-07 |
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Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101262434B (en) * | 2003-02-07 | 2010-12-01 | 日本电信电话株式会社 | Multicast transfer route setting method, and multicast label switching method for implementing former method |
| CN1306734C (en) * | 2003-03-04 | 2007-03-21 | 华为技术有限公司 | Service link protecting method for intelligent optical network |
| CN1309221C (en) * | 2003-06-08 | 2007-04-04 | 华为技术有限公司 | User facility double returning method based on multi-protocol label exchange |
| CN100370736C (en) * | 2003-09-02 | 2008-02-20 | 华为技术有限公司 | Method for managing resources based on planes |
| CN1323518C (en) * | 2003-09-28 | 2007-06-27 | 华为技术有限公司 | Route path fault repairing method |
| CN100372312C (en) * | 2004-03-31 | 2008-02-27 | 华为技术有限公司 | Method for realizing label switching path network |
| CN100359860C (en) * | 2004-09-27 | 2008-01-02 | 华为技术有限公司 | Multiprotocol label switching network protection switching method |
| CN100397826C (en) * | 2004-09-30 | 2008-06-25 | 华为技术有限公司 | Protection switching method in multiprotocol label switching system |
| US7515529B2 (en) * | 2004-12-14 | 2009-04-07 | Cisco Technology, Inc. | Efficient mechanism for fast recovery in case of border router node failure in a computer network |
| CN100508521C (en) | 2005-02-06 | 2009-07-01 | 华为技术有限公司 | Binding work-label exchanging route and method for protecting label exchange route |
| US7933197B2 (en) * | 2005-02-22 | 2011-04-26 | Cisco Technology, Inc. | Method and apparatus for constructing a repair path around a non-available component in a data communications network |
| CN100407725C (en) * | 2005-04-15 | 2008-07-30 | 华为技术有限公司 | Method for realizing multi-protocol tag exchange bidirectional protection switching |
| CN101146115B (en) * | 2005-04-15 | 2011-08-10 | 华为技术有限公司 | Implementation method for bidirectional protective switching of multi-protocol label switching |
| CN100421387C (en) * | 2005-09-08 | 2008-09-24 | 华为技术有限公司 | Business flow protection method |
| CN100414910C (en) * | 2005-09-19 | 2008-08-27 | 华为技术有限公司 | Bussiness flow protection system and method |
| CN100403734C (en) * | 2005-11-02 | 2008-07-16 | 华为技术有限公司 | Business flor protection method |
| CN101453414B (en) * | 2007-11-30 | 2011-08-10 | 华为技术有限公司 | Head node protection method, system and equipment for point to multiple points label switch path |
| CN101212366B (en) * | 2007-12-21 | 2011-12-21 | 杭州华三通信技术有限公司 | Failure detection method, system, and main node in Ethernet loop network |
| CN101616062B (en) * | 2008-06-26 | 2012-07-04 | 中兴通讯股份有限公司 | Method for realizing IP transmitting |
| CN101771610B (en) * | 2009-12-24 | 2012-05-09 | 中兴通讯股份有限公司 | Transport multiprotocol label switching network (T-MPLS) system and link protection method |
| CN102857420B (en) * | 2012-08-24 | 2016-01-20 | 中兴通讯股份有限公司 | The method and system of cross-line card protection method, relevant apparatus and line card service access PTN |
| US11870682B2 (en) | 2021-06-22 | 2024-01-09 | Mellanox Technologies, Ltd. | Deadlock-free local rerouting for handling multiple local link failures in hierarchical network topologies |
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