CN101047641A - Stationary restart method of CR-LSR - Google Patents
Stationary restart method of CR-LSR Download PDFInfo
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Abstract
This invention discloses a method for restarting controlled route label switch router(CR-LSR) stably including: when the control plane of a controlled route label distribution protocol(CR-LDP) of the CR-LSP is re-started up, its transmission plane continues to transmit packet data normally according to the CR-LSP set up before re-starting, the CR-LSP re-started up by the CR-LDP gets information from adjacent CR-LSP to resume CR-LSP information in its CR-LDP control plane, when the CR-LDP control plane of the CR-LSR is re-started up, the transmission plane transmits packet data according to the transmission information after re-starting up so as to secure continuous transmission of data packets in the re-starting up process of the control plane.
Description
Technical field
The present invention relates to multi protocol label exchange (MPLS, Multiple Protocol Label Switching) technology, be meant the steady method for restarting of a kind of CR-LSR (CR-LSR, Constraint-basedRouting-Label Switch Router) especially.
Background technology
The MPLS technology is internet engineering task group (IETF, Internet Engineering Task Force) the IP high-speed backbone cross winding dehorn standard of new generation of Ti Chuing, it is with three-layer network border agreement (IP, InternetProtocol) and the switching technology of second layer exchange, its core concept is: data are classified, and according to different classes of for the packet distribute labels, set up label switched path (LSP, LabelSwitch Path), according to the mark that is distributed respective data packet is forwarded to the destination by LSP in the MPLS network then, because each the MPLS node on the LSP is when carrying out the packet forwarding, only need read the mark of respective data packet, and need not read the IP address of this packet, therefore improved the forwarding speed of packet greatly.
Label distribution protocol (LDP, Label Distribution Protocol) is basic MPLS signaling and control protocol, mainly solves data are classified, are the packet distribute labels and set up problems such as LSP according to classification.Its core provides corresponding message and LSP is set up and safeguarded to method.The limited label distribution protocol of route (CR-LDP) then is a kind of expansion of LDP, it is based on the LDP framework, content by expansion LDP message, promptly in the LDP of standard message, carry bandwidth, jumping (ERHop shows paths, Explicit Route Hop) and resource information such as resource type, realize setting up and satisfy traffic engineering (TE, Traffic Engineering) LSP of demand and assurance Quality of Service, it is the purpose of the limited label switched path of route (CR-LSP, Constraint-based Routing LabelSwitch Path).
For system based on CR-LDP, transmitting in the process of packet by the CR-LSP that sets up, the situation that exists certain or some CR-LSR nodes wherein to break down and restart, at this moment in order to realize highly reliable (HA, High Viability) function, often take the CR-LSP that originally before restarting, to be set up to delete fully, rebulid new CR-LSP then, the result causes the partial data packet loss by the CR-LSP transmission of original foundation, causes the significant wastage of customer service interruption and system resource.
Summary of the invention
The object of the present invention is to provide the steady method for restarting of a kind of CR-LSR, solve CR-LSR node in the existing CR-LDP system and restart the packet loss that caused and the problem of system resource waste.
Steady method for restarting according to CR-LSR of the present invention mainly comprises the steps:
A, when the limited label distribution protocol CR-LDP of the route of CR-LSR control plane is restarted, the forwarding information forwarding packet data that its Forwarding plane sends before continuing to restart according to this CR-LDP control plane;
B, after the CR-LDP of this CR-LSR control plane is restarted, the forwarding information forwarding packet data that Forwarding plane sends according to the CR-LDP control plane after restarting.
In the step a of said method, the mode that described CR-LDP control plane is restarted is: carry out the CR-LSR that the CR-LDP control plane restarts and obtain the limited label switched path CR-LSP of route information from its adjacent C R-LSR, recover the CR-LSP that this restarts CR-LSR.
In the step a of said method, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the Ingress node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A11, restart CR-LSR and receive mapping message from its downstream CR-LSR, and judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if then send the request message of the CR-LSP parameter information comprise configuration to this downstream CR-LSR;
After a12, this downstream CR-LSR receive this request message, restart CR-LSR to this and send mapping message;
A13, restart CR-LSR and carry out resource distribution, recover CR-LSP according to the mapping message that receives.
In the step a of said method, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the intermediate node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A21, restart CR-LSR and receive request message, and carry CR-LSP parameter information and suggestion mark in this message, and receive mapping message from its downstream CR-LSR from its upstream CR-LSR;
A22, restart CR-LSR judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if then send a request message to its downstream CR-LSR;
After a23, downstream CR-LSR receive this request message, restart CR-LSR to this and send mapping message;
A24, this restarts after CR-LSR receives mapping message from its downstream CR-LSR, carries out resource distribution according to the information in this mapping message, and sends mapping message to its upstream CR-LSR, recovers CR-LSP.
In the step a of said method, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the Egress node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A31, restart CR-LSR and receive request message, and carry CR-LSP parameter information and suggestion mark in this message from its upstream CR-LSR;
A32, restart CR-LSR judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if, then carry out resource distribution, and send mapping message, recover CR-LSP to its upstream CR-LSR according to the CR-LSP parameter information in the received message.
In said method, described step a32 further comprises: when the forwarding information of information in the received message and current Forwarding plane does not match, the reception request message is handled as new request message.
In said method, described CR-LSP parameter information comprises: ERHops, traffic requirement and resources-type information.
In said method, described step a further comprises: when the CR-LDP of CR-LSR control plane is restarted, and the forwarding threshold marker that it is all is a failure state; And when described CR-LDP control plane recovers, remove the failure state mark of described forwarding inlet.
In said method, described step a further comprises: when the CR-LDP of CR-LSR control plane is restarted, start and transmit the maintenance timer; And when before described CR-LDP control plane is being transmitted the maintenance timer expiry, recovering, remove the failure state mark of described forwarding inlet.
In said method, described forwarding information is the CR-LSP forwarding-table item information.
In sum, the present invention discloses the steady method for restarting of a kind of CR-LSR, this method comprises: when the CR-LDP of CR-LSR control plane is restarted, its Forwarding plane continues to restart the preceding forwarding information that sends according to this CR-LDP control plane, promptly continues to carry out normal grouped data according to the CR-LSP that is set up before restarting and transmits; The CR-LSR that the CR-LDP control plane is restarted obtains information from its adjacent C R-LSR, recovers the CR-LSP information in its CR-LDP control plane.After the CR-LDP of this CR-LSR control plane was restarted, the forwarding information that Forwarding plane sends according to the CR-LDP control plane after restarting carries out grouped data to be transmitted, thereby guaranteed not interrupting of in restarting process user grouping data forwarding.
Description of drawings
Fig. 1 is the steady method for restarting flow chart according to CR-LSR of the present invention.
Fig. 2 is a CR-LDP network topology structure schematic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The present invention is based on the CR-LSR system of distributed frame, promptly the control plane of CR-LSR system and Forwarding plane separated structures that is to say, the control plane of CR-LSR node system and Forwarding plane are respectively by different firm and hard existing.Below, for the sake of clarity, control plane and the Forwarding plane of CR-LSR carried out brief description.At first, control plane mainly comprise Routing Protocol as: open shortest path is through preferential (OSPF, Open Shortest Path First) or Border Gateway Protocol (BGP,, Border GatewayProtocol) etc. mpls protocol is as LDP or resource reservation protocol (rsvp) etc. and system support module, control plane is set up the required forwarding-table item of forwarding packet data (as: IP transmits with MPLS and transmits etc.) mainly by carrying out information interaction with adjacent C R-LSR.Forwarding plane is mainly used in after control plane generates forwarding-table item, according to the forwarding-table item forwarding packet data.
In the present invention, control plane comprises control plane mainboard and control plane slave board, and wherein the control plane mainboard is used to realize above-mentionedly set up CR-LSP alternately with adjacent CR-LSR node, and the control Forwarding plane carries out the function that corresponding grouped data is transmitted.Then the back up in realtime data message of control plane mainboard of control plane slave board, and when the control plane mainboard breaks down, this control plane slave board is switched and is the control plane mainboard, and in self system, set up CR-LSP according to backed up data information, control Forwarding plane then and carry out corresponding grouped data and transmit.Former control plane mainboard then changes the control plane slave board into after its system restoration is normal, realize the current control plane mainboard of backup, the function of the data message of promptly former control plane slave board.That is to say, control plane of the present invention can carry out the firm and hard existing of masterslave switchover by two, therefore control plane of the present invention is restarted and is meant the control plane slave board after former control plane mainboard breaks down, and recovers the process of the CR-LSP before former control plane mainboard breaks down according to backed up data information.And for Forwarding plane, be that control plane mainboard or control plane slave board all belong to control plane, therefore be referred to as control plane and restart.
Core concept of the present invention is: when the CR-LDP of CR-LSR control plane was restarted, its Forwarding plane continued to restart the preceding forwarding information that sends according to this CR-LDP control plane and carries out normal grouped data forwarding; After the CR-LDP of this CR-LSR control plane was restarted, the forwarding information that Forwarding plane sends according to the CR-LDP control plane after restarting carries out grouped data to be transmitted, thereby the forwarding that guarantees packet in the control plane restarting process is not interrupted.
Wherein, the mode that the CR-LDP control plane is restarted is: carry out the CR-LSR that the CR-LDP control plane restarts and obtain information from its adjacent C R-LSR, recover the CR-LSP of this CR-LSR.And above-mentioned forwarding information specifically is meant the CR-LSP forwarding-table item.
Below by specific embodiment detailed description (GR, Graceful Restart) method of steadily restarting according to CR-LSR of the present invention.This method flow specifically comprises the steps: as shown in Figure 1
Step 101: when the CR-LDP of CR-LSR control plane is restarted, start and transmit the maintenance timer, keep the forwarding state of its Forwarding plane before this control plane is restarted, and the forwarding threshold marker that it is all is a failure state.
Wherein, as mentioned above, the CR-LDP control plane is restarted the CR-LDP control plane mainboard that specifically is meant as CR-LSR and is broken down, and carries out after the masterslave switchover, and former control plane slave board is switched the process of setting up CR-LDP for the control plane mainboard.At this moment, this control plane mainboard, therefore promptly former control plane slave board need be failure state with this part information flag because backup has the data message of former control plane mainboard, also being about to transmit threshold marker is failure state.And timer is set is for fear of restarting when failure when control plane, and system is in wait state always.
Step 102: when before the CR-LDP control plane is being transmitted the maintenance timer expiry, recovering, remove the failure state mark of described forwarding inlet.
Wherein, the CR-LDP control plane is finished restarting process, as mentioned above, mainly is meant by setting up CR-LSP alternately with adjacent C R-LSR node.
Step 103: the forwarding-table item that Forwarding plane sends according to the CR-LDP control plane after restarting carries out grouped data to be transmitted, thereby the forwarding that finally guarantees user service data in the process that control plane is restarted is not interrupted.
More than be the overall procedure of the inventive method, below to above-mentioned steps 102, promptly the restarting process of CR-LDP control plane is elaborated.
For the sake of clarity, the process of setting up of CR-LSP is described at first, owing to constitute the node of a CR-LSP, promptly CR-LSR generally includes three types, i.e. inlet (Ingress) node, centre (Transit) node and outlet (Egress) node.Therefore, CR-LSP of supposition is made of three CR-LSR node R TA, RTB and RTC below; Wherein, RTA is the Ingress node of this CR-LSP, and RTB is an intermediate node, and RTC is an Egress node.The following describes foundation from RTA through the process of RTB to the CR-LSP of RTC, at first, set up RTA and RTB respectively, and the session between RTB and the RTC; Secondly, send mark request (Label Request) message according to pre-configured to RTB by RTA, and in this message, comprise traffic engineering (TE, Traffic Engineering) parameter information, as: ERHops and flow parameter etc.; After RTB receives this request message, carry out respective handling, send Label Request message to its downstream node RTC then according to this message; After RTC receives this message, find it oneself is outlet, therefore apply for a mark, and carry out resource reservation or resource distribution, send mark mapping (Label Mapping) message to RTB then; After RTB receives this message, carry out resource reservation equally, send Label Mapping message to RTA then; After RTA receives this LabelMapping message, also carry out resource reservation, finish the foundation of this CR-LSP.In addition, in above-mentioned CR-LSP, have only an intermediate node RTB, but in fact may there be a plurality of intermediate nodes in a CR-LSP, in this case, the processing mode of a plurality of intermediate nodes and above-mentioned single intermediate node, promptly the processing mode of RTB is identical, repeats no more herein.
The process of setting up of CR-LSP more than has been described, has the following describes the CR-LSP node, be i.e. (GR) method of steadily restarting of CR-LSR.As mentioned above, the node that constitutes a CR-LSP comprises three types of Ingress node, intermediate node and Egress nodes, and all there is the possibility that breaks down and restart in any one node wherein, therefore restarting with Ingress node RTA, intermediate node RTB and Egress node RTC respectively below is that example illustrates when corresponding CR-LSR node is restarted the restoration methods of CR-LDP control plane.
In network topology structure shown in Figure 2, when router is restarted, have only the router adjacent to be affected with this router, other router in the network is then and do not know that this router restarts.When control plane was restarted, packet is transmitted can be not influenced.Steadily method for restarting allows to carry out recovering when state switches signaling information when router.
At first, the restoration methods of its CR-LDP control plane when Ingress node RTA is restarted is described, this moment, the node adjacent with this RTA was downstream node RTB, and this method flow specifically comprises the steps:
Step 301: when Ingress node RTA was restarted, RTA received the recovery Label Mapping message from the downstream node RTB that is adjacent.
Wherein, include all Mapping information that before this RTA is restarted RTB sends to RTA in this recovery Label Mapping message, as: ERHops, transmission requirement, resources-type and other CR-LSP parameter.
After step 302:RTA receives this Label Mapping message, judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if, then according to the Label Request message of CR-LSP attribute information after this downstream node RTB transmission is restarted, and in this message, comprise such as TE parameter informations such as the hop information on flow parameter, the path from configuration in restarting before.
Wherein, the CR-LSP information of configuration is meant the storage medium in system before the restarting described in this step, as: canned data in the hard disk, this information are restarted Shi Buhui at control plane and are lost.
After step 303:RTB receives this Label Request message, return second Label Mapping message to RTA again.
Step 304:RTA carries out resource distribution according to the Label Mapping message that receives, thus the CR-LSP before recovering to restart.
The restoration methods of its CR-LDP control plane when Ingress node RTA is restarted more than has been described, the following describes the restoration methods of its CR-LDP control plane when intermediate node RTB is restarted, this moment, the node adjacent with this RTB comprised: upstream node RTA and downstream node RTC, this method flow specifically comprises the steps:
Step 401: when intermediate node RTB is restarted, RTB receives the recovery Label Request message from upstream node RTA, and include CR-LSP parameter information and suggestion mark in this message, this suggestion mark is exactly the mark that sent to RTA before RTB is restarted; Simultaneously, RTB receives the recovery Label Mapping message from downstream node RTC.
After step 402:RTB receives above-mentioned two message, judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if then RTC downstream resends LabelRequest message.
Step 403:RTC returns LabelMapping message to RTB after receiving this Label Request message.
Step 404:RTB carries out resource distribution according to the information that is comprised in this message after receiving this Label Mapping message, and returns Label Mapping message to RTA, thereby recovers the CR-LSP on the RTB.
The restoration methods of its CR-LDP control plane when intermediate node RTB is restarted more than has been described, the restoration methods of its CR-LDP control plane when the following describes Egress node RTC and restarting, this moment, the node adjacent with this node R TC was upstream node RTB, and this method flow specifically comprises the steps:
Step 501: send Label Request message by upstream node RTB to restarting RTC, and carry CR-LSP parameter information and suggestion mark in this message, the mark that sends to RTB before this advises mark and RTC is restarted is the same.
After step 502:RTC receives Label Request message from upstream node RTB, judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if, then carry out resource reservation according to the CR-LSP parameter information in the received message, and to RTB transmission LabelMapping message, thereby recover CR-LSP.
By said method, the CR-LSP signaling message can recover in restarting router.CR-LSP has such as ERHOPs, transmission parameter information and parameter such as resources-type.It is indispensable recovering all these parameters in restarting process, and for example: the recovery transmission parameter information will be guaranteed to carry out control plane after restarting when deleted as CR-LSP at router from restart, and resources such as bandwidth are rationally discharged.Because transport plane has the information relevant with mark, therefore from the transport plane recovering information.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, the steady method for restarting of a kind of CR-LSR CR-LSR is characterized in that, this method comprises the steps:
A, when the limited label distribution protocol CR-LDP of the route of CR-LSR control plane is restarted, the forwarding information forwarding packet data that its Forwarding plane sends before continuing to restart according to this CR-LDP control plane;
B, after the CR-LDP of this CR-LSR control plane is restarted, the forwarding information forwarding packet data that Forwarding plane sends according to the CR-LDP control plane after restarting.
2, method according to claim 1, it is characterized in that, among the step a, the mode that described CR-LDP control plane is restarted is: carry out the CR-LSR that the CR-LDP control plane restarts and obtain the limited label switched path CR-LSP of route information from its adjacent C R-LSR, recover the CR-LSP that this restarts CR-LSR.
3, method according to claim 2 is characterized in that, among the step a, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the Ingress node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A11, restart CR-LSR and receive mapping message from its downstream CR-LSR, and judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if then send the request message of the CR-LSP parameter information comprise configuration to this downstream CR-LSR;
After a12, this downstream CR-LSR receive this request message, restart CR-LSR to this and send mapping message;
A13, restart CR-LSR and carry out resource distribution, recover CR-LSP according to the mapping message that receives.
4, method according to claim 2 is characterized in that, among the step a, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the intermediate node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A21, restart CR-LSR and receive request message, and carry CR-LSP parameter information and suggestion mark in this message, and receive mapping message from its downstream CR-LSR from its upstream CR-LSR;
A22, restart CR-LSR judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if then send a request message to its downstream CR-LSR;
After a23, downstream CR-LSR receive this request message, restart CR-LSR to this and send mapping message;
A24, this restarts after CR-LSR receives mapping message from its downstream CR-LSR, carries out resource distribution according to the information in this mapping message, and sends mapping message to its upstream CR-LSR, recovers CR-LSP.
5, method according to claim 2 is characterized in that, among the step a, when the CR-LSR of restarting when the described CR-LDP of carrying out control plane was the Egress node of CR-LSP, the step that described CR-LDP control plane is restarted comprised:
A31, restart CR-LSR and receive request message, and carry CR-LSP parameter information and suggestion mark in this message from its upstream CR-LSR;
A32, restart CR-LSR judge in the received message information whether with the forwarding information coupling of current Forwarding plane, if, then carry out resource distribution, and send mapping message, recover CR-LSP to its upstream CR-LSR according to the CR-LSP parameter information in the received message.
6, method according to claim 5 is characterized in that, described step a32 further comprises: when the forwarding information of information in the received message and current Forwarding plane does not match, the reception request message is handled as new request message.
According to each described method in the claim 3 to 6, it is characterized in that 7, described CR-LSP parameter information comprises: show paths and jump ERHops, traffic requirement and resources-type information.
8, according to each described method in the claim 1 to 6, it is characterized in that described step a further comprises: when the CR-LDP of CR-LSR control plane is restarted, and the forwarding threshold marker that it is all is a failure state; And when described CR-LDP control plane recovers, remove the failure state mark of described forwarding inlet.
9, method according to claim 8 is characterized in that, described step a further comprises: when the CR-LDP of CR-LSR control plane is restarted, start and transmit the maintenance timer; And when before described CR-LDP control plane is being transmitted the maintenance timer expiry, recovering, remove the failure state mark of described forwarding inlet.
According to each described method in the claim 1 to 6, it is characterized in that 10, described forwarding information is the CR-LSP forwarding-table item information.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136936A (en) * | 2010-11-24 | 2011-07-27 | 华为技术有限公司 | Method, node and system for preventing control plane faults from influencing operation of forward data plane |
| CN101296239B (en) * | 2008-06-18 | 2011-10-26 | 杭州华三通信技术有限公司 | Method for refreshing label exchange route and label exchange router |
| CN102238138A (en) * | 2010-04-23 | 2011-11-09 | 中兴通讯股份有限公司 | Pseudo wire service processing method and system |
| CN103916277A (en) * | 2014-04-11 | 2014-07-09 | 杭州华三通信技术有限公司 | Method and device for not interrupting forwarding service in rebooting process |
| US9350650B2 (en) | 2011-03-14 | 2016-05-24 | Hangzhou H3C Technologies Co., Ltd. | Switching to a backup traffic path by a label switching router in a multi-protocol label switching network |
| CN108011754A (en) * | 2017-11-27 | 2018-05-08 | 新华三技术有限公司 | Turn control piece-rate system, backup method and device |
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2006
- 2006-06-27 CN CNB2006100905339A patent/CN100550840C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296239B (en) * | 2008-06-18 | 2011-10-26 | 杭州华三通信技术有限公司 | Method for refreshing label exchange route and label exchange router |
| CN102238138A (en) * | 2010-04-23 | 2011-11-09 | 中兴通讯股份有限公司 | Pseudo wire service processing method and system |
| CN102136936A (en) * | 2010-11-24 | 2011-07-27 | 华为技术有限公司 | Method, node and system for preventing control plane faults from influencing operation of forward data plane |
| CN102136936B (en) * | 2010-11-24 | 2014-07-09 | 华为技术有限公司 | Method, node and system for preventing control plane faults from influencing operation of forward data plane |
| US9350650B2 (en) | 2011-03-14 | 2016-05-24 | Hangzhou H3C Technologies Co., Ltd. | Switching to a backup traffic path by a label switching router in a multi-protocol label switching network |
| CN103916277A (en) * | 2014-04-11 | 2014-07-09 | 杭州华三通信技术有限公司 | Method and device for not interrupting forwarding service in rebooting process |
| CN108011754A (en) * | 2017-11-27 | 2018-05-08 | 新华三技术有限公司 | Turn control piece-rate system, backup method and device |
| CN108011754B (en) * | 2017-11-27 | 2021-11-09 | 新华三技术有限公司 | Transfer control separation system, backup method and device |
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| Publication number | Publication date |
|---|---|
| CN100550840C (en) | 2009-10-14 |
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