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Method and device thereof for switching double-layer multicast links

A layer 2 multicast and link switching technology, applied in branch offices providing special services, data exchange details, data exchange network, etc. Effect

Active Publication Date: 2010-12-22
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention provides a layer-2 multicast link switching method and its device, which are used to solve the problem that the multicast forwarding link cannot be switched in time during the switching process of the layer-2 multicast link in the existing subway system

Method used

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  • Method and device thereof for switching double-layer multicast links
  • Method and device thereof for switching double-layer multicast links
  • Method and device thereof for switching double-layer multicast links

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Embodiment Construction

[0035] Aiming at the above-mentioned problems in the prior art, the embodiment of the present invention proposes a technical solution applicable to Layer 2 multicast link switching in a subway system. In this technical solution, when the wireless Mesh link is switched, the vehicle-mounted MP proxy client sends a multicast join message to the current active link to ensure that the multicast traffic is not interrupted, and further sends a multicast leave message to the original link To reduce the redundant traffic in the network, so as to realize the timely switchover of the Layer 2 multicast link, and then ensure that the Layer 2 multicast traffic does not interrupt.

[0036] In the embodiment of the present invention, on the one hand, when the wireless link is switched, the vehicle-mounted MP first sends a corresponding multicast join message to the trackside MP connected to the new link according to the locally maintained multicast group situation. message to ensure that the ...

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Abstract

The invention discloses a method and a device thereof for switching double-layer multicast links, which are applied in a subway system of a track side access device, a vehicle-mounted access device and a vehicle-mounted client. The method comprises the following steps of: when switching the active links between the vehicle-mounted access device and the track side access device, acting for the vehicle-mounted client by the vehicle-mounted access device to send a multicast adding message to the track side access device connected to the current active link through the current active link; and maintaining the radio port of the current active link as a double layer multicast router port. By adopting the invention, the timely switching of the multicast forwarding link can be ensured in the process of switching double layer multicast link of the subway system, thereby the continuity of the multicast stream is ensured.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a layer-2 multicast link switching method and device applied to a subway system. Background technique [0002] WLAN (Wireless Local Area Networks, wireless local area network) can be used to expand or replace an existing wired local area network, and provide network access and roaming services for wireless users. [0003] WLANMesh network is a new type of wireless local area network. Different from the traditional WLAN, the APs (AccessPoints) in the WLANMesh network are wirelessly connected, and multi-hop wireless links can be established between the APs. [0004] WLANMesh technology is mainly used in areas such as subway tunnels, such as figure 1 As shown, all RailMPs (that is, trackside MPs, where MP is the English abbreviation of MeshPoint, representing a Mesh network access point) are connected to a Switch (switch), as shown in the figure, RailMP1-4 are connected to th...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/18H04L45/16
Inventor 吕君
Owner NEW H3C TECH CO LTD
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