CN1859288A - Method for multicast data uninterrupted repeat - Google Patents
Method for multicast data uninterrupted repeat Download PDFInfo
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- CN1859288A CN1859288A CNA2005101020840A CN200510102084A CN1859288A CN 1859288 A CN1859288 A CN 1859288A CN A2005101020840 A CNA2005101020840 A CN A2005101020840A CN 200510102084 A CN200510102084 A CN 200510102084A CN 1859288 A CN1859288 A CN 1859288A
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Abstract
The present invention discloses a multicasting data no-break transmitting method, referring to computer network communication technology field. It contains when non-root bridge three-layer equipment protocol root port switching, non-root bridge three-layer equipment configuring new root port as multicasting transmitting port, and through new root port transmitting neighbor finding protocol message to root bridge three-layer equipment appointed port, root bridge three-layer equipment receiving neighbor finding protocol message configuring appointed port multicasting transmitting port, through said appointed port responding neighbor finding protocol message to new root port, non-root bridge three-layer equipment receiving root bridge three-layer equipment responded neighbor finding protocol message, continue transmitting link establishment and multicasting data between new root port and said appointed port through said link. The present invented method can shorten multicasting retransmission blockage time interval duo to root port switching, to make time interval dropping to 10 millisecond level, satisfying multicasting service real time requirement, and raising multicasting retransmission efficiency.
Description
[technical field]
The present invention relates to the computer network communication technology field, relate in particular to a kind of method that keeps multicast data uninterrupted forwarding.
[background technology]
As shown in Figure 1, it is the basic block diagram of computer communication network, user's flow inserts three-tier switch by Access Network, a plurality of three-tier switch converge (shown in the frame of broken lines among the figure) with flow to the upper level three-tier switch, the effect of converging by three-tier switch, at last user's flow is sent to the Internet service provider by core net, the Internet service provider is delivered to the user for the business that the user provides according to opposite direction, thereby realizes professional end-to-end connection.Wherein, the aggregation networks that has been connected to form Access Layer of these three-tier switch, in general, the VLAN (VLAN) that three-tier switch connects is divided into two kinds of forms:
1, converge by two layers, the port of all three-tier switch all is configured to identical VLAN, and all flows converge to core net by the mode of two layers of Ethernet exchange.
2, converge by three layers, three-tier switch converge flow go into VLAN and to go out VLAN configuration different, that is to say, the different VLAN of entrance and exit configuration of three-tier switch, to reach intercommunication between these VLAN, can only be by three layers IP intercommunication, flow converges to core net by the mode of three layers of IP exchange.
In order to guarantee the reliability of link, some three-tier switch of butt joint may be with (for example N of a plurality of physical port, N 〉=2) be configured in the same VLAN (multiport VLAN), another switch also has a plurality of ports (N) to be configured in this VLAN simultaneously, and the N of these two a switches physical port docks one by one.Because multicast packet is a broadcast transmission at the send mode of two layers of ethernet link, therefore support the application of multicast service, under the situation of multiport VLAN butt joint, multicast packet can produce broadcast storm on the ethernet link of butt joint, in order to prevent two layers of broadcast storm on the ethernet link, should on all of the port of three-tier switch, move Spanning-Tree Protocol, as RSTP (RSTP), MSTP (Multiple Spanning Tree Protocol).If three-tier switch docks by three layers of ethod of remittance, for supporting multicast forwarding, should start multicast routing protocol on the three-tier switch, as PIM (protocol-independent multicast) agreement, on whole network, generate multicast transmit tree by exchange multicast routing protocol information between the switch, at the inner multicast forward table that generates of each switch, instruct the forwarding of multicast packet, keep connective by the periodic handshake message (as the HELLO message of PIM) that sends between the switch simultaneously.Under the situation of multiport VLAN, port below the VLAN is because moved Spanning-Tree Protocol, on all physical ports that a VLAN interface comprises, synchronization can only be received the multicast protocol message from unique port, and flux of multicast only sends receiving on the port of multicast routing protocol, thereby reaches the purpose according to port precise relay flux of multicast.
Whether real-time sense receives the multicast protocol message on all of the port of three-tier switch below VLAN, if port snooping is to the multicast protocol message, just this port is set to the multicast forwarding port, and the port of not intercepting the multicast protocol message is set to block the multicast forwarding port; If the multicast forwarding port is not received the multicast protocol message in a period of time, the multicast forwarding port will become obstruction multicast forwarding port, has guaranteed that thus multicast packet can be by precise relay on port.
As shown in Figure 2, the schematic diagram that docks for three-tier switch.Three-tier switch L3 (A), three-tier switch L3 (B) go up the operation multicast routing protocol, both are by the three layer interfaces butt joint of identical vlan number, the P1 of three-tier switch L3 (A), P2 port, the P3 of three-tier switch L3 (B), P4 port are to belong to the ethernet port that docks VLAN, these ports all are configured in the same VLAN, join on P1 port and the P3 ports physical, join on P2 port and the P4 ports physical.
On P1, P2, P3, P4 port, move Spanning-Tree Protocol, the bridge ID of the bridge ID of switch L3 (A) less than switch L3 (B) is set, P1 corresponding port ID is less than P2 corresponding port ID, P3 corresponding port ID is less than P4 corresponding port ID, by Spanning-Tree Protocol mechanism, election switch L3 (A) is the root bridge, and P1, P2 are the designated ports of Spanning-Tree Protocol, the Spanning-Tree Protocol state of port is Forwarding (forwarding), can receive the forwarding data; Switch L3 (B) is a nonroot bridge, and P3 is a root port, and the Spanning-Tree Protocol state of port is Forwarding (forwarding), can receive the forwarding data, P4 is optional port, and the Spanning-Tree Protocol state of port is Discarding (abandoning), can not receive the forwarding data.
Send the multicast protocol message between switch L3 (A), the L3 (B) mutually, switch L3 (A) can only receive the multicast protocol message that switch L3 (B) sends from the P3 port on the P1 port, switch L3 (B) can only receive the multicast protocol message that switch L3 (A) sends from the P1 port on the P3 port.Therefore switch L3 (A), L3 (B) respectively P1, P3 port be set to the multicast forwarding port, P2, P4 port are set to block the multicast forwarding port.
In the running of Spanning-Tree Protocol, if the root port of switch L3 (B) is changed into P4 from P3, this root port handover operation is 10 Milliseconds, the result of switching is that the Spanning-Tree Protocol state of P3 port changes Discarding into by Forwarding, the Spanning-Tree Protocol state of P4 port changes Forwarding into by Discarding, but,, thereby cause that transmitting multicast data is blocked between switch L3 (A), L3 (B) at this situation P4 port multicast data forwarding at once.Because the P4 port is not also received the regular handshake message that inter-exchange sends mutually, so the P4 port still blocks the multicast forwarding port; Generally speaking, the transmission time interval of the regular handshake message that inter-exchange sends mutually is a minute level, when root port switches, switch L3 (B) does not send handshake message from the P4 port at once, but when the transmission cycle of the next handshake message of switch L3 (B) regulation arrives, just can send handshake message to switch L3 (A), when the P2 port on the switch L3 (A) receives switch L3 (B) for the first time from handshake message that the P4 port sends, switch L3 (A) changes into the multicast forwarding port with the P2 port from blocking the multicast forwarding port, then, when the transmission cycle of the next handshake message of switch L3 (A) regulation arrives, just can send handshake message to switch L3 (B), switch L3 (B) is when the P4 port is received handshake message for the first time, switch L3 (B) changes into the multicast forwarding port with the P4 port from blocking the multicast forwarding port, so far, switch L3 (A), just recovered transmitting multicast data between L3 (B).Because the P1 port is not received periodically handshake message in a period of time, the P1 port will be changed into from the multicast forwarding port and block the multicast forwarding port.Here need to prove, when root port switches, might not be to send handshake message by the P4 port to the P2 port earlier, also might be that the P2 port sends handshake message to the P4 port earlier, and in other words, it is at random that the priority of P2, P4 port sends handshake message.But no matter be that P2 port or P4 port send handshake message earlier, all can reach the blocking-up of minute level between switch L3 (A), the L3 (B) to transmitting multicast data, this does not rely on the speed of system processor, but depends on the agreement official hour.
Therefore, when present technical scheme is switched at the Spanning-Tree Protocol root port, will produce the multicast packet blocking-up of minute level between the switch, for carry out real time multicast service on three-tier switch, the multicast packet blocking-up of this minute level can not be allowed.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of method of multicast data uninterrupted forwarding, under situation about connecting by the VLAN that comprises many physical ports between the three-tier switch, and on VLAN interface, move multicast routing protocol, on all of the port of VLAN, move Spanning-Tree Protocol, when the root port of Spanning-Tree Protocol changes, can keep multicast data uninterrupted forwarding, the time interval of the multicast forwarding blocking-up that produces when shortening is switched because of root port, the efficient of raising multicast forwarding.
The present invention is achieved by the following technical solutions:
A kind of method of multicast data uninterrupted forwarding when the root port of Spanning-Tree Protocol on the nonroot bridge three-layer equipment switches, may further comprise the steps:
101, the root port that the nonroot bridge three-layer equipment is new is set to the multicast forwarding port, and sends neighbor discovery protocol message by new root port to the designated port of root bridge three-layer equipment;
When 102, root bridge three-layer equipment was received described neighbor discovery protocol message, described designated port was set to the multicast forwarding port, responded neighbor discovery protocol message by this designated port to described new root port;
103, after the nonroot bridge three-layer equipment is received the neighbor discovery protocol message of root bridge three-layer equipment response, described new root port and the link establishment between the described designated port, multicast packet continues to transmit by this link.
Also comprised before step 101: when the root port of Spanning-Tree Protocol on the nonroot bridge three-layer equipment switched, the Spanning-Tree Protocol state of new root port and old root port is respectively to be transmitted and abandons.
In the step 101, when the new root port of nonroot bridge three-layer equipment was set to the multicast forwarding port, old root port was set to block the multicast forwarding port.
In the step 101, the periodicity neighbor discovery protocol message transmission timer of at first overtime its inside of nonroot bridge three-layer equipment, and then by the designated port transmission neighbor discovery protocol message of new root port to root bridge three-layer equipment.
In the step 102, the periodicity neighbor discovery protocol message transmission timer of at first overtime its inside of root bridge three-layer equipment, and then pass through described designated port and respond neighbor discovery protocol message to described new root port.
Improvement of the present invention is: described three-layer equipment is three-tier switch or router.
Improvement of the present invention is: described neighbor discovery protocol message is your good message of protocol-independent multicast or participates in message.
Improvement of the present invention is: described Spanning-Tree Protocol is RSTP or Multiple Spanning Tree Protocol.
Among the present invention, when the root port of Spanning-Tree Protocol changes, adopt above-mentioned technical scheme can keep multicast data uninterrupted forwarding, the time interval of the multicast forwarding blocking-up that produces when shortening is switched because of root port, make the time interval be reduced to 10 Milliseconds from a minute level, satisfy the requirement of multicast service real-time, improve the efficient of multicast forwarding.
[description of drawings]
Fig. 1 is the basic block diagram of computer communication network.
Fig. 2 is two three-tier switch butt joint schematic diagrames.
Fig. 3 is a method flow diagram of realizing multicast data uninterrupted forwarding among the present invention.
[embodiment]
Below in conjunction with drawings and Examples the present invention is further set forth:
Connect by the VLAN that comprises many physical ports between the three-tier switch among the present invention, on the VLAN interface of butt joint, move multicast routing protocol, on all ethernet ports that this VLAN of butt joint comprises, move Spanning-Tree Protocol; The state of port is defined as two kinds: multicast forwarding state, obstruction multicast forwarding state.
As shown in Figure 2, two three-tier switch butt joints, three-tier switch L3 (A), three-tier switch L3 (B) go up the operation multicast routing protocol, both are by the three layer interfaces butt joint of identical vlan number, the P1 of three-tier switch L3 (A), P2 port, the P3 of three-tier switch L3 (B), P4 port are to belong to the ethernet port that docks VLAN, these ports all are configured in the same VLAN, join on P1 port and the P3 ports physical, join on P2 port and the P4 ports physical.
On P1, P2, P3, P4 port, move Spanning-Tree Protocol, the bridge ID of the bridge ID of three-tier switch L3 (A) less than three-tier switch L3 (B) is set, P1 corresponding port ID is less than P2 corresponding port ID, P3 corresponding port ID is less than P4 corresponding port ID, by Spanning-Tree Protocol mechanism, election three-tier switch L3 (A) is the root bridge, and P1, P2 are the designated ports of Spanning-Tree Protocol, the Spanning-Tree Protocol state of port is Forwarding (forwarding), can receive the forwarding data; Three-tier switch L3 (B) is a nonroot bridge, and P3 is a root port, and the Spanning-Tree Protocol state of port is Forwarding (forwarding), can receive the forwarding data, P4 is optional port, and the Spanning-Tree Protocol state of port is Discarding (abandoning), can not receive the forwarding data.
Under the situation of operate as normal, all started periodically handshake message transmission timer on three-tier switch L3 (A), the three-tier switch L3 (B) respectively, assumption period is m second (m＞0 second), the process m of timer cycle is overtime second, three-tier switch L3 (A) and three-tier switch L3 (B) send the multicast handshake message mutually, only in this way could guarantee the reliable intercommunication between two three-tier switch.Because the multicast handshake message mutually sends between P1 port and P3 port, so P1, P3 port be set to the multicast forwarding state, and P2, P4 port are set to block the multicast forwarding state.
What need here to replenish is that the multicast handshake message can be HELLO (hello) message of PIM, it also can be JOIN (participation) message, but no matter be any message, can be referred to as neighbor discovery protocol message, send out neighbor discovery protocol message between the switch mutually, its objective is the accessibility of confirming the other side, make flux of multicast can arrive the other side smoothly.
As shown in Figure 3, for realizing the method flow diagram of multicast data uninterrupted forwarding, its detailed process is:
The first step: when between P1 port and the P3 port link failure taking place, multicast data flow is transmitted and is interrupted, when three-tier switch L3 (B) detects this fault message, root port will take place on the three-tier switch L3 (B) switch, that is: root port becomes P4 port (new root port) by P3 port (old root port); Three-tier switch L3 (B) changes into the multicast forwarding state with the P4 port from blocking the multicast forwarding state at once, the P3 port is changed into from the multicast forwarding state blocked the multicast forwarding state simultaneously.At this moment, the Spanning-Tree Protocol state of P3 port is Discarding (abandoning), can not receive the forwarding data, and the Spanning-Tree Protocol state of P4 port is Forwarding (forwarding), can receive the forwarding data.
Second step: three-tier switch L3 (B) is time out period handshake message transmission timer at once, does not wait for that the transmission cycle of multicast handshake message arrives, and sends the multicast handshake message to the P2 port at once on the P4 port.
The 3rd step: (the Spanning-Tree Protocol state of P2 port is Forwarding (forwarding) when the P2 port of three-tier switch L3 (A), can receive and transmit data) to go up when receiving the multicast handshake message for the first time, the P2 port is changed into the multicast forwarding state from blocking the multicast forwarding state at once; Three-tier switch L3 (A) is time out period handshake message transmission timer at once, does not wait for that the transmission cycle of multicast handshake message arrives, and sends the multicast handshake message to the P4 port at once on the P2 port.
The 4th step: the P4 port receives the multicast handshake message, show that three-tier switch L3 (B) and three-tier switch L3 (A) can both arrive mutually, at this moment, P2, P4 port all are set to the multicast forwarding state, link establishment between P2, the P4, flux of multicast is realized uninterrupted forwarding by this link.
The present invention realizes the method for uninterrupted forwarding flux of multicast, avoided sending mutually between the three-tier switch multicast existing periodicity time interval of handshake message, when the nonroot bridge three-tier switch detects the link layer fault and when ethernet port taking place switching (root port switches), the overtime at once multicast handshake message of nonroot bridge three-tier switch cycle timer, initiatively send the multicast handshake message by new root port, and any one ethernet port of root bridge switch is when receiving the multicast handshake message for the first time, the also overtime at once multicast handshake message cycle timer of root bridge three-tier switch, send the multicast handshake message to the nonroot bridge switch, so just accelerated the link establishment between root bridge switch and the nonroot bridge switch, reduce the time that group business stream interrupts, improved forward efficiency.
In addition, three-tier switch among the present invention can be replaced with router, no matter be three-tier switch or router, all belong to the three-layer equipment that carries routing function, as long as connect by the VLAN that comprises many physical ports between them, on the VLAN interface of butt joint, move multicast routing protocol, on all ethernet ports that this VLAN of butt joint comprises, move Spanning-Tree Protocol, just can adopt the method for uninterrupted forwarding of the present invention, realize purpose of the present invention.
Claims (8)
1, a kind of method of multicast data uninterrupted forwarding when the root port of Spanning-Tree Protocol on the nonroot bridge three-layer equipment switches, may further comprise the steps:
101, the root port that the nonroot bridge three-layer equipment is new is set to the multicast forwarding port, and sends neighbor discovery protocol message by new root port to the designated port of root bridge three-layer equipment;
When 102, root bridge three-layer equipment was received described neighbor discovery protocol message, described designated port was set to the multicast forwarding port, responded neighbor discovery protocol message by this designated port to described new root port;
103, after the nonroot bridge three-layer equipment is received the neighbor discovery protocol message of root bridge three-layer equipment response, described new root port and the link establishment between the described designated port, multicast packet continues to transmit by this link.
2, the method for a kind of multicast data uninterrupted forwarding according to claim 1, it is characterized in that, also comprised before step 101: when the root port of Spanning-Tree Protocol on the nonroot bridge three-layer equipment switched, the Spanning-Tree Protocol state of new root port and old root port is respectively to be transmitted and abandons.
3, the method for a kind of multicast data uninterrupted forwarding according to claim 1 is characterized in that: in the step 101, when the new root port of nonroot bridge three-layer equipment was set to the multicast forwarding port, old root port was set to block the multicast forwarding port.
4, the method for a kind of multicast data uninterrupted forwarding according to claim 1, it is characterized in that: in the step 101, the periodicity neighbor discovery protocol message transmission timer of at first overtime its inside of nonroot bridge three-layer equipment, and then by the designated port transmission neighbor discovery protocol message of new root port to root bridge three-layer equipment.
5, the method for a kind of multicast data uninterrupted forwarding according to claim 1, it is characterized in that: in the step 102, the periodicity neighbor discovery protocol message transmission timer of at first overtime its inside of root bridge three-layer equipment, and then pass through described designated port and respond neighbor discovery protocol message to described new root port.
6, according to the method for the arbitrary described a kind of multicast data uninterrupted forwarding of claim 1 to 5, it is characterized in that: described three-layer equipment is three-tier switch or router.
7, according to the method for the arbitrary described a kind of multicast data uninterrupted forwarding of claim 1 to 5, it is characterized in that: described neighbor discovery protocol message is your good message of protocol-independent multicast or participates in message.
8, the method for a kind of multicast data uninterrupted forwarding according to claim 1 is characterized in that: described Spanning-Tree Protocol is RSTP or Multiple Spanning Tree Protocol.
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| CNB2005101020840A CN100417139C (en) | 2005-12-01 | 2005-12-01 | Method for multicast data uninterrupted repeat |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296105B (en) * | 2008-06-11 | 2011-04-20 | 杭州华三通信技术有限公司 | Multicast fast switching method and system, three-layer network appliance |
| CN103701703A (en) * | 2013-12-31 | 2014-04-02 | 杭州华三通信技术有限公司 | Neighbourhood management method and device |
| CN108512751A (en) * | 2017-02-28 | 2018-09-07 | 华为技术有限公司 | A kind of port status processing method and the network equipment |
| CN109818804A (en) * | 2019-02-26 | 2019-05-28 | 北京邮电大学 | A kind of network monitoring method and device |
| CN113904980A (en) * | 2021-09-30 | 2022-01-07 | 北京东土科技股份有限公司 | Channel switching method, device, switch and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6947419B2 (en) * | 2001-06-12 | 2005-09-20 | Acute Technology Corp. | Apparatus for multicast forwarding in a virtual local area network environment |
| US7389359B2 (en) * | 2001-10-19 | 2008-06-17 | Foundry Networks, Inc. | Method and system for intelligently forwarding multicast packets |
| CN100499530C (en) * | 2002-05-10 | 2009-06-10 | 华为技术有限公司 | IP group broadcast route forwarding optimizing method |
| CN1232081C (en) * | 2002-08-06 | 2005-12-14 | 华为技术有限公司 | Repeating method for multi-broadcast message in network communication |
| CN100372292C (en) * | 2003-08-11 | 2008-02-27 | 华为技术有限公司 | Method for making multicast accurate to terminal in three-layer switchboard |
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2005
- 2005-12-01 CN CNB2005101020840A patent/CN100417139C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101296105B (en) * | 2008-06-11 | 2011-04-20 | 杭州华三通信技术有限公司 | Multicast fast switching method and system, three-layer network appliance |
| CN103701703A (en) * | 2013-12-31 | 2014-04-02 | 杭州华三通信技术有限公司 | Neighbourhood management method and device |
| CN103701703B (en) * | 2013-12-31 | 2017-05-10 | 新华三技术有限公司 | Neighbourhood management method and device |
| CN108512751A (en) * | 2017-02-28 | 2018-09-07 | 华为技术有限公司 | A kind of port status processing method and the network equipment |
| CN108512751B (en) * | 2017-02-28 | 2021-02-23 | 华为技术有限公司 | Port state processing method and network equipment |
| CN109818804A (en) * | 2019-02-26 | 2019-05-28 | 北京邮电大学 | A kind of network monitoring method and device |
| CN113904980A (en) * | 2021-09-30 | 2022-01-07 | 北京东土科技股份有限公司 | Channel switching method, device, switch and storage medium |
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| CN100417139C (en) | 2008-09-03 |
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