CN102891759B

CN102891759B - A kind of ring protection method of the multicast service based on MPLS-TP network

Info

Publication number: CN102891759B
Application number: CN201210398323.1A
Authority: CN
Inventors: 曾峻波
Original assignee: HANGZHOU CHENXIAO TECHNOLOGIES Co Ltd
Current assignee: HANGZHOU CHENXIAO TECHNOLOGY Co.,Ltd.; HANGZHOU PREVAIL OPTOELECTRONIC EQUIPMENT Co.,Ltd.; Hangzhou Wanlong Communication Technology Co.,Ltd.
Priority date: 2012-10-19
Filing date: 2012-10-19
Publication date: 2016-02-03
Anticipated expiration: 2032-10-19
Also published as: CN102891759A

Abstract

The present invention relates to the protection of MPLS-TP network, especially a kind of ring protection method of the multicast service based on MPLS-TP network, 1) the method is used for ring topo, and configuration multicast service open loop that is clockwise, both direction counterclockwise on ring, open loop is made up of PW; 2) is multicast table by IGMP? Snooping protocol generation; 3) pretection switch relies on the initiation of the oam detected state of PW to switch, and completes fault delivery by lower slotting AIS; 4) the elan ownership and amendment multicast list of switching by adjusting AC completes.The present invention is easy to carry out, and meets multicast performance and the protection requirement of transmission network.

Description

A kind of ring protection method of the multicast service based on MPLS-TP network

Technical field

The present invention relates to the protection of MPLS-TP network, especially a kind of ring protection method of the multicast service based on MPLS-TP network.

Technical background

The multicasting solution of MPLS-TP network is mostly multicast distribution tree being multicast routing protocol such as PIM-SM or PIM-DM etc. occuping 3 layers and setting up MPLS at present, this scheme following points are not enough: 1.PIM agreement itself is complicated, but also need unicast routing protocol support, the agreement safeguarded is complicated, is a solution of three layers completely; 2. the support of pair protection is weak, and protection needs to rely on Routing Protocol and again restrained according to network topo, and protection switch time is long, is not suitable for the protection of transmission network; 3. pair hardware requirement is high, and existing multicast scheme needs to support multicast in MPLS aspect.A lot of chip does not support the multicast of MPLS; 4. the topo of transmission network mostly is ring, and existing multicasting solution is the evolution scheme of 3 layers of multicast, is more suitable for grid net.

Summary of the invention

The present invention is the defect and the deficiency that solve such scheme existence, provides one and is easy to carry out, and meets the multicast performance of transmission network and protect the ring protection method of the multicast service based on MPLS-TP network required.

Technical scheme of the present invention: a kind of ring protection method of the multicast service based on MPLS-TP network,

1) the method is used for ring topo, and configuration multicast service open loop that is clockwise, both direction counterclockwise on ring, open loop is made up of PW;

2) multicast table is by IGMPSnooping protocol generation;

3) pretection switch relies on the initiation of the oam detected state of PW to switch, and completes fault delivery by lower slotting AIS;

4) the elan ownership and amendment multicast list of switching by adjusting AC completes.

Preferably, after two multicast service open-loop configuration in step 1) complete, each website configures two elan, is respectively used to form clockwise and counterclockwise multicast service, and AC or PW of lower business can elan belonging to the state dynamic conditioning of multicast service ring.

Preferably, in step 1), link point comprises A, B, C, D, E, F, the multicast server server in step 1), step 1) multicast service recipient client1, client2, client3, client4.

Preferably, link point configures two elan, and on these two elan enable IGMPSnooping, and generate multicast list by IMGPsnooping.

Operation principle of the present invention:

1) the method is applicable to ring topo;

2) the protection switch time requirement being less than 50ms can be met;

3) on ring, configure clockwise direction and anticlockwise two service path open loops protected each other, all multicast services are all distributed on this two paths, and each section of open loop is made up of PW;

4) multicast service has two parts of flows on ring, a in clockwise open loop, a in counterclockwise open loop;

5) use IGMPsnooping or static configuration to form multicast forward table, transmit not based on MPLS label, occupy IP or MAC;

6) on the PW forming the open loop of multicast service path, run PWOAM, and configuration cycle is 3.3ms, and inserts AIS when the PW fault of upstream to the PW in downstream, the link point in initiating failure point downstream is switched;

7) switch and need adjustment from the elan belonging to AC or PW of the upper and lower business of ring and revise multicast forward table.

The present invention is easy to carry out, and meets multicast performance and the protection requirement of transmission network.

Accompanying drawing explanation

Fig. 1 is the topo figure of multicast ring of the present invention;

Fig. 2 is the schematic diagram after the present invention disposes two multicast open loops;

Fig. 3 is protection philosophy schematic diagram when having run into ring fault after the present invention has disposed.

Embodiment

Below in conjunction with accompanying drawing, the present invention is further detailed explanation, but be not limiting the scope of the invention.

As shown in Figure 1, the topo figure of the multicast ring of MPLS-TP network, supposes there is a server providing multicast service, has the client of a lot of receiving multicast business simultaneously.

As shown in Figure 2, the ring deploy clockwise direction shown in Fig. 1 and counterclockwise two multicast service open loop paths, the steps include:

1. in the clockwise multicast service path open loop of ring deploy.

Between A, F, E, D, C, B, configure PWaf respectively, PWfe, PWed, PWdc, PWcb. and PWaf is denoted as branchpw on A, F is denoted as rootpw; PWfe is denoted as branchpw on F, and E is denoted as rootpw; PWed is denoted as branchpw on E, and D is denoted as rootpw; PWdc is denoted as branchpw on D, and C is denoted as rootpw; PWcb is denoted as branchpw on C, and B is denoted as rootpw;

2. in the multicast service path open loop that ring deploy is counterclockwise.

Between A, B, C, D, E, F, configure PWab respectively, PWbc, PWcd, PWde, PWef. and PWab is denoted as branchpw on A, B is denoted as rootpw; PWbc is denoted as branchpw on B, and C is denoted as rootpw; PWcd is denoted as branchpw on C, and D is denoted as rootpw; PWde is denoted as branchpw on D, and E is denoted as rootpw; PWef is denoted as branchpw on E, and F is denoted as rootpw;

So far clockwise and counterclockwise multicast service path open loop is disposed complete.

3. points all on ring carries out business configuration.

At node A, F, E, D, C configure AC0, AC4, AC3, AC2, AC1.

At node F, E, D, C, B configure respectively two e-lan business, one of them supposes to be numbered 1 for clockwise multicast service, and another supposes to be numbered 2 for counterclockwise multicast service.AC default configuration is from the upper and lower business of clockwise multicast path.A configuration elan business on the A node connecting multicast source, clockwise with counterclockwise multicast path PW is put in this elan with the AC being connected multicast source, and namely on A node, elan comprises AC0, PWaf, PWab.On F node, elan1 comprises AC4, PWaf, PWfe.Elan2 comprises PWef.On E node, elan1 comprises AC3, PWfe, PWed.Elan2 comprises PWde, PWef.On D node, elan1 comprises AC2, PWed, PWdc.Elan2 comprises PWcd, PWde.On C node, elan1 comprises AC1, PWdc, PWcb.Elan2 comprises PWbc, PWcd.On B node, elan1 comprises PWcb.Elan2 comprises PWbc, PWab.

4. enable IGMPSnooping agreement.

The elan of configuration in step 3 uses IGMPSnooping agreement.And the rootpw on ring is configured to router port.

So far, the configuration of multicast ring and business configuration are disposed complete.Suppose that client1 will add group address group1, now client sends igmpjoin message to C, and C, according to snooping agreement, sends join message to rootpw i.e. PWbc, PWdc, and according to the Determines multicast list of PWbc and PWdc.On C, namely form multicast list (elan1, group1, AC1, PWdc), (elan2, group1, PWcd).The object sending join message to PWbc and PWdc from multicast server, flux of multicast can be introduced multicast ring on clockwise and counter clockwise direction.The join message sent to PWdc can along counterclockwise arriving D, E, F, A on clockwise multicast path.And at the corresponding multicast forward table of the upper formation of D, E, F, A.The multicast forward table that the analytic process that same client2, client3, client4 add group group1 is finally formed with client1. on each link point is:

Node A:(elan, group1, AC0, PWab, PWaf)

Node F:(elan1, group1, AC4, PWaf, PWfe); (elan2, group1, PWef)

Node E:(elan1, group1, AC3, PWfe, PWed); (elan2, group1, PWde, PWef)

Node D:(elan1, group1, AC2, PWed, PWdc); (elan2, group1, PWcd, PWde)

Node C:(elan1, group1, AC1, PWdc); (elan2, group1, PWbc, PWcd)

Node B: (elan2, group1, PWab, PWbc)

As shown in Figure 3, suppose C, fiber failure between D, then PWdc and PWcd interrupts.We see the process of D node first.PWdc is branchpw on D, and his interruption does not affect the state in multicast loop footpath.PWcd is rootpw on D, and node D needs to insert AIS on PWde, and E inserts AIS to PWef after receiving the AIS on PWde.Now because at node D, E, F are from the upper and lower business of clockwise multicast ring, so the fault between C, D does not affect their business, also do not need to switch.The process of following C node again.PWdc is rootpw on C.His interruption affects the multicast service of client1.C compares the state of PWdc and PWbc, and PWbc is good.C will adjust to elan2 AC1 from elan1, and on elan2, revises multicast table for (elan2, group1, AC1, PWbc).So far client1 is from the upper and lower business of anticlockwise multicast ring.Complete the pretection switch under the fault of multicast loop footpath.And under PWcb, insert ais alarm, cause switching of downstream website.The fault of other situations can draw with reference to analysis above.Finally between C, D, under fault condition, the multicast forward table of links point is:

Node A:(elan, group1, AC0, PWab, PWaf)

Node F:(elan1, group1, AC4, PWaf, PWfe); (elan2, group1, PWef)

Node E:(elan1, group1, AC3, PWfe, PWed); (elan2, group1, PWde, PWef)

Node D:(elan1, group1, AC2, PWed, PWdc); (elan2, group1, PWcd, PWde)

Node C:(elan1, group1, PWdc); (elan2, group1, AC1, PWbc, PWcd)

Node B: (elan2, group1, PWab, PWbc)

Work as C, between D after fault recovery, C stops inserting under the AIS of PWcb.D stops inserting AIS under PWde.Whether C node is optional returns to from the upper and lower business of clockwise direction multicast ring.

Claims

1., based on a ring protection method for the multicast service of MPLS-TP network, it is characterized in that:

1) the method is used for ring topo, and configuration multicast service open loop that is clockwise, both direction counterclockwise on ring, open loop is made up of pseudo-line PW;

2) multicast table is by IGMPSnooping protocol generation;

3) pretection switch relies on the initiation of the oam detected state of PW to switch, and by lower slotting alarm indication signal AIS(AlarmIndicationSignal) complete fault delivery;

4) the emulated LAN elan ownership and amendment multicast list of switching by adjusting line attachment AC completes;

After two multicast service open-loop configuration in step 1) complete, each website configures two emulated LAN elan, be respectively used to form clockwise and counterclockwise multicast service, and AC or PW of lower business can emulated LAN elan belonging to the state dynamic conditioning of multicast service ring;

On link point configure two emulated LAN elan, and on these two emulated LAN elan enable IGMPSnooping, generate multicast list by IGMPSnooping.

2. the ring protection method of a kind of multicast service based on MPLS-TP network according to claim 1; it is characterized in that: in step 1), link point comprises A, B, C, D, E, F; multicast source is multicast server server, and multicast service recipient is client1, client2, client3, client4.