CN102780587B - The method of looped network protection is realized in MPLS-TP - Google Patents
The method of looped network protection is realized in MPLS-TP Download PDFInfo
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- CN102780587B CN102780587B CN201210293012.9A CN201210293012A CN102780587B CN 102780587 B CN102780587 B CN 102780587B CN 201210293012 A CN201210293012 A CN 201210293012A CN 102780587 B CN102780587 B CN 102780587B
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Abstract
Present invention is disclosed a kind of method realizing looped network protection in MPLS-TP, it by creating looped network protection group in looped network, special interruption/lasting looped network forward-path forwarding LSP is created in looped network protection group, and the message forwarded on the type LSP is adopted certain encapsulation format, make in message transmission or receiving course, when certain port failure of network element, the message that all down hops point to described port is all transmitted by described Protection path; And after port failure recovers, transmission or the reception of message return in the path of normal operating conditions.The present invention has the fault detect of MPLS-TP looped network, link protection, Node Protection, makes MPLS-TP network to dispose looped network, realizes the network of high reliability.
Description
Technical field
The present invention relates to network communication technology field, particularly relate to the method realizing looped network protection in MPLS-TP.
Background technology
MPLS-TP (Multi-Protocol Label Switching Transport Profile, multiprotocol label switching transmission network standard) be that the joint working group set up by ITU-T and IETF proposed in April, 2008, its predecessor is the T-MPLS technical standard that ITU-T starts in May, 2005 to develop.
Along with the development of the communication technology, MPLS-TP becomes transmission network and develops a main flow direction.MPLS-TP technology simplifies multiprotocol label switching (MPLS), pseudo-line (MPLS/PW) technology and transforms, and introduces the concepts such as transport network layering, OAM and protection, meets the demand of transport network.MPLS-TP, in order to adapt to the demand of transmission network, proposes the concept of layering, mainly the section of being divided into layer (Section Layer), LSP layer (Label Switch Path Layer), PW layer (Pseudo WireLayer).Respective OAM (Operations is defined for each layer; Administration; andMaintenance) standard, also defines the linear protection standard of LSP (Label Switch Path) and PW (Pseudo Wire).
Protection is as the core topic of in MPLS-TP network; the guaranteed reliability of primary responsibility network; when network failure or transmission quality reduce, complete by faulty link switching to backup link, within the shortest time, recover normal service communication.Inside IETF RFC5654, clear and definite demand is proposed to protection, be mainly divided into linear protection and looped network protection based on topology.Linear protection mainly provides the protection of LSP (Label Switch Path) and PW (Pseudo Wire), at present comparative maturity.Looped network protection does not also have clear and definite implementation method at present; the present invention proposes the OAM standard of the one section of utilization layer (Section Layer), provides the implementation method of looped network protection, completes the annular networking of MPLS-TP; realize protecting switching fast, reach the application demand of transmission network.
Summary of the invention
Main purpose of the present invention is for MPLS-TP network looped network protection demand, and the fault detect providing a kind of mechanism to complete MPLS-TP looped network, link protection, Node Protection make MPLS-TP network to dispose looped network, realize the network of high reliability.
For achieving the above object, the present invention proposes following technical scheme: a kind of method realizing looped network protection in MPLS-TP, looped network protection group is created in looped network, looped network protection group comprises the Protection path LSP of network element, in message process of transmitting, when certain port failure of network element, the message that all down hops point to described port is all transmitted by described Protection path; Comprise:
Corresponding outlet network element ID and ingress label is searched with the mapping table of outlet network element from LSP;
The message label that will forward is exchanged or press-in identification (RFID) tag;
Encapsulate described message according to outlet network element ID and be pressed in LSP; And
Label in press-in LSP enters looped network and is transferred to network element node corresponding to outlet network element ID.
Further, when described network element is the start node of protected LSP, the message of forwarding is directly pressed into ingress label; When described network element is the intermediate node of protected LSP, the Tag switching of the message of forwarding becomes ingress label.
Described LSP, with the mapping table of outlet network element, if when described network element is the start node of protected LSP, then identifies with the FEC that network element is corresponding; As described in network element be the intermediate node of protected LSP, then enter label to identify with corresponding.
Described Protection path forwards LSP for interrupting/continuing.
Described message comprises G-ACH head, and G-ACH head comprises source network element ID and object network element ID.
When the port failure of described network element recovers, in Protection path, the transmitted traffic of message returns in the network path of normal condition.
The present invention also proposes the method realizing looped network protection in another kind of MPLS-TP; in looped network, create looped network protection group, looped network protection group comprises the Protection path LSP of network element, in the receiving course of message; when certain port failure of network element, the operation of message is comprised:
By packet loss identical with described network element ID for source network element ID in message;
Message identical with described network element ID for object network element ID in message is resolved, and forwards according to vpn label; And
Message not identical with described network element ID for object network element ID in message is forwarded along described LSP.
Described Protection path forwards LSP for interrupting/continuing.
Described message comprises G-ACH head, and G-ACH head comprises described source network element ID and object network element ID.
When the port failure of described network element recovers, in Protection path, the reception flow of message returns in the network path of normal condition.
Compared with prior art; the method of looped network protection is realized in the MPLS-TP that the present invention proposes; MPLS-TP network is made to dispose looped network; save the input of the network equipment; the network service guarantee of high reliability is provided; thus make the MPLS-TP packet switching network really can replace traditional SDH (Synchronous Digital Hierarchy, SDH (Synchronous Digital Hierarchy)) transmission network.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that in MPLS-TP looped network of the present invention, network element ID distributes;
Fig. 2 is that the present invention is at the schematic diagram interrupting/continue forwarding data message encapsulation format in LSP;
Fig. 3 is the interruption/lasting schematic diagram forwarding LSP of two different directions that the present invention sets up in network elements;
Fig. 4 is that the present invention is being interrupted/continuing forwarding the flow chart carrying out data message reception in LSP;
Fig. 5 is the workflow diagram of protection group when sending datagram in looped network of the present invention;
Fig. 6 is the flow chart of the present invention's different conditions work in a network.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme in the preferred embodiment of the present invention.
The MPLS-TP looped network protection implementation method that the present invention proposes by creating looped network protection group, and according to message in the process of this looped network repeating and reception, according to the different operating state of network element, carries out different process, with the reliability of Logistics networks.
What the present invention created looped network protection group mainly comprises following process:
Create NE mark: this stage network element be mainly in looped network distributes a unique mark, numeral is adopted to carry out representation, a network element in each digital unique identification looped network, mark can adopt manual configuration fraction, also can certainly employ system MAC Address to calculate.As shown in Figure 1, device A allocation identification is 1, and equipment B allocation identification is 2, and equipment C allocation identification is 3, and equipment D allocation identification is 4.
Create LSP (Label Switching Path, label switched path) and export the mapping table of network element: this stage is mainly the binding relationship creating the outlet network element ID of each protected LSP in looped network and corresponding MPLS forwarding label (this network element of the LSP inlet identity namely in table one).In binding relationship table, if this network element is the intermediate node of protected LSP, this network element enters label to identify with corresponding, if this network element is the start node of protected LSP, use corresponding FEC mark to represent, binding relationship is as shown in following table one:
Table one LSP and the mapping table exporting network element
| This network element of LSP inlet identity | Go out ring network element ID | Go out looped network unit and enter label |
| 50 | 1 | 100 |
| 51 | 2 | 100 |
| 52 | 4 | 201 |
| LSP1 | 2 | 202 |
Following establishment looped network forward-path, this stage creates the special LSP of two different directions, and the present invention is called Break-and-Continue LSP (interrupting/continue forwarding LSP).Break-and-ContinueLSP is mainly with the feature in face, namely when message will forward on this type LSP, encapsulation format in the present invention must be adopted, be illustrated in figure 2 the message encapsulation format in the present embodiment, it forwards head by MPLS standard, G-ACH (Generic Associated Channel, general federated passage) head and initial data composition, wherein carry source network element ID and object network element ID in G-ACH head.
Create the binding of looped network forward-path and port: this stage determines the binding relationship of port and Protection path; create a protection group; when two ports of network element in looped network are all normal; all messages are pressed original route and are forwarded; when certain port failure of network element, the message that all down hops point to this interface is all transmitted by Protection path.As shown in Figure 3, network element C protection group has Break-and-Continue LSP1 and the Break-and-Continue LSP2 of two different directions.
As shown in Figure 4, when network element from then on LSP receive message, first check that whether the source network element ID in message is identical with this network element ID, if identical, then shows have loop to occur, dropping packets and notify the corresponding event of application layer; Secondly, check that whether the object network element ID in message is identical with this network element ID, if the same terminate this message carry out corresponding decapsulation, and then forward according to vpn label, if difference, the label according to Break-and-Continue LSP normally forwards.
As shown in Figure 5, in looped network protection group, when in the looped network of network element place, two interfaces all normally work, protection group enters normal operating conditions; When network element is in this state, all messages normally forward by original route.
When in the looped network of network element place, an interface breaks down, looped network protection group enters protection operating state, and when network element is in this state, institute's handlebar faulty link is handled as follows as the message of down hop:
If protected LSP is start node; then search corresponding outlet network element ID and ingress label from creating LSP with the mapping table of outlet network element; then the data message press-in ingress label that will forward and according to the head exporting network element ID encapsulation GACH, the label of final press-in Break-and-Continue LSP enters looped network and is transferred to network element node corresponding to outlet network element ID.
If protected LSP is intermediate node; then search corresponding outlet network element ID and ingress label from LSP with the mapping table of outlet network element; then the Tag switching of the data message that will forward is become ingress label and according to the head of outlet network element ID encapsulation GACH, the label of final press-in Break-and-Continue LSP enters looped network and is transferred to network element node corresponding to outlet network element ID.
Be illustrated in figure 6 the state variation flow chart of MPLS-TP looped network protection implementation method of the present invention in network application; when the monitoring network event module in network finds that network thing occurs; decision event type is that port failure event or port failure recover event; if port failure event; then find the looped network protection group that malfunctioning interface is corresponding; the flow switch received by the message of normal state and send, to Protection path, makes looped network protection group enter protection operating state.
When network event is port failure recovery event; the looped network protection group finding malfunctioning interface corresponding; and the flow under guard mode is returned in the path of former normal operating conditions; thus realize when port network breaks down; realize switching the quick protection of network path, reach the application demand of transmission network.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (2)
1. realize a method for looped network protection in MPLS-TP, it is characterized in that: in looped network, create looped network protection group, looped network protection group comprises the interruption/lasting forwarding protection path LSP of the network element of two different directions,
In message process of transmitting, when certain port failure of network element, the message that all down hops point to described port is all transmitted by described Protection path; Comprise:
Search corresponding outlet network element ID and ingress label from LSP with the mapping table of outlet network element, described LSP, with the mapping table of outlet network element, if when described network element is the start node of protected LSP, then identifies with the FEC that network element is corresponding; As described in network element be the intermediate node of protected LSP, then enter label to identify with corresponding;
When described network element is the start node of protected LSP, the message of forwarding is directly pressed into ingress label; When described network element is the intermediate node of protected LSP, the Tag switching of the message of forwarding becomes ingress label;
Encapsulate described message according to outlet network element ID and be pressed in LSP, described message comprises G-ACH head, and G-ACH head comprises source network element ID and object network element ID; And
The press-in label interrupting/continue in forwarding LSP enters looped network and is transferred to network element node corresponding to outlet network element ID;
In the receiving course of message, when certain port failure of network element, the operation of message is comprised:
By packet loss identical with described network element ID for source network element ID in message;
Message identical with described network element ID for object network element ID in message is resolved, and forwards according to vpn label;
And message not identical with described network element ID for object network element ID in message is forwarded along described LSP.
2. method according to claim 1, is characterized in that: when the port failure of described network element recovers, in Protection path, the transmitted traffic of message returns in the network path of normal condition.
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| CN102970219B (en) * | 2012-11-30 | 2016-03-30 | 华为技术有限公司 | The method and apparatus of binding guard ring |
| CN104798349B (en) * | 2013-01-30 | 2018-08-07 | 慧与发展有限责任合伙企业 | In response to the failure transfer of port failure |
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| CN101095058A (en) * | 2004-09-16 | 2007-12-26 | 以色列阿尔卡特电信公司 | Efficient protection mechanisms for protecting multicast traffic in a ring topology network utilizing label switching protocols |
| CN101895455A (en) * | 2010-07-19 | 2010-11-24 | 南京邮电大学 | Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP) |
| CN102185773A (en) * | 2011-05-09 | 2011-09-14 | 杭州华三通信技术有限公司 | Multi-protocol label switching transport profile ring protection switching method and node |
| CN102577260A (en) * | 2009-07-24 | 2012-07-11 | 瑞典爱立信有限公司 | Methods and arrangement in a mpls-tp telecommunications network for oam functions |
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| CA2379594C (en) * | 2002-03-28 | 2010-03-09 | Tropic Networks Inc. | Label distribution protocol supporting multiple classes of service in a multi protocol label switching (mpls) network, methods and mpls network using thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101095058A (en) * | 2004-09-16 | 2007-12-26 | 以色列阿尔卡特电信公司 | Efficient protection mechanisms for protecting multicast traffic in a ring topology network utilizing label switching protocols |
| CN102577260A (en) * | 2009-07-24 | 2012-07-11 | 瑞典爱立信有限公司 | Methods and arrangement in a mpls-tp telecommunications network for oam functions |
| CN101895455A (en) * | 2010-07-19 | 2010-11-24 | 南京邮电大学 | Method for fast protecting ring network based on multi-protocol label switching transport profile (MPLS-TP) |
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Effective date of registration: 20171124 Address after: Xinghan street Suzhou Industrial Park in Jiangsu province 215000 No. 5 Building No. 6 Room 201 Patentee after: Suzhou Sheng Ke science and Technology Co., Ltd. Address before: Xinghan Street Industrial Park of Suzhou city in Jiangsu province 215021 No. 5 (Tengfei Industrial Square) B building 4 floor 13/16 unit Patentee before: Centec Networks (Suzhou) Inc. |