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Method and device for enhancing reliability of multicast forwarding

A reliable and multicast technology, applied in branch offices providing special services, data exchange details, digital transmission systems, etc., can solve problems such as traffic interruption, failure to receive Join packets, timeout, etc., to extend the timeout period, Realize the effect of uninterrupted forwarding

Active Publication Date: 2011-06-15
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Because PIM requires each multicast device to periodically send Join packets to the upstream neighbor device, the device that undergoes active / standby switchover will not send Join messages to the upstream neighbor device until it completes the learning of multicast routing entries and multicast forwarding entries. If the learning time is too long, the upstream neighbor device will not receive the Join message for a long time, and the JP Timer (Join / Prune Timer) will time out, so the upstream neighbor device will switch the active / standby The outgoing interface connected to the device is cut off, resulting in traffic interruption

Method used

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  • Method and device for enhancing reliability of multicast forwarding
  • Method and device for enhancing reliability of multicast forwarding
  • Method and device for enhancing reliability of multicast forwarding

Examples

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Embodiment 1

[0032] see figure 2 , the method for improving the reliability of multicast forwarding provided by the embodiment of the present invention specifically includes:

[0033] 201: When a Join message sent by a first multicast device of a downstream neighbor is received from the first interface, start timing. Specifically, a JP Timer timer may be started for timing.

[0034] 202: When the timing reaches the preset first join timeout time, judge whether a message containing the new identifier (GenID) of the outgoing interface of the first multicast device sent by the first multicast device is received from the first interface during the timing process. Hello message, the outbound interface refers to the interface through which the first multicast device sends the Join message, and the new identifier is temporarily generated, which is the same as the outbound interface identifier contained in the Join message sent by the first multicast device last time. Different, that is, the tem...

Embodiment 2

[0063] see Figure 8 , the embodiment of the present invention also provides a device for improving the reliability of multicast forwarding, including:

[0064] A join timing module 801, configured to start timing when the device receives a join message from the first multicast device of the downstream neighbor from the first interface;

[0065] Delay module 802, used for judging whether the device receives a new identifier containing the outgoing interface of the first multicast device from the first multicast device during the timing process handshake message, if so, extend the first join timeout to the second join timeout.

[0066] In this embodiment, preferably, the difference between the second join timeout and the first join timeout is equal to the difference between the time when the handshake message is received and the time when the join message is received.

[0067] Further, see Figure 9 , the above-mentioned device also includes:

[0068]The first judging modul...

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Abstract

The invention provides a method for improving multicast forwarding reliability and a device thereof, belonging to the technical field of multicasting. The method comprises the following steps: timing when receiving a Join message, which is sent from first multicast equipment of a downstream neighbor, from a first interface; and when the timing reaches a preset first Join message timeout time, judging whether a Hello message containing a new mark of the outlet interface of the first multicast equipment is received from the first multicast equipment during the timing process, and if yes, prolonging the first Join message timeout time to a second Join message timeout time. The device comprises a timing module and a time prolonging module. The method prolongs the Join message when detecting restart of the downstream multicast equipment, so as to avoid multicast flow interruption arising from timeout of the Join message sent from upstream neighbor equipment due to excessive restart time ofthe downstream multicast equipment, thereby realizing uninterrupted multicast data forwarding.

Description

technical field [0001] The invention relates to the field of multicast technology, in particular to a method and device for improving the reliability of multicast forwarding. Background technique [0002] IP multicast technology realizes efficient data transmission from point to multipoint in IP network. Because multicast technology can effectively save bandwidth, control network traffic, reduce server load, and reduce network load, it is widely used in real-time data transmission, multimedia conferences, games, and simulations. The IP multicast protocol includes the protocol between the router and the receiver host and the protocol between the router and the router. The combination of the two is used to build a multicast forwarding tree from the multicast source to the multicast data receiver. IGMP (Internet Group Management Protocol, multicast group management protocol) is usually used between routers and receiver hosts, and PIM (Protocol Independent Multicast, Protocol I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L12/18
CPCH04L12/185H04L12/1877
Inventor 苏海洋梁艳荣郝卫国
Owner HUAWEI TECH CO LTD
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