IP multicasting precision port repeat method in three layer exchanging

An IP multicast and three-layer switching technology, which is applied in store-and-forward switching systems, data exchange through path configuration, electrical components, etc., can solve problems such as inability to solve the problem of precise port forwarding in a VLAN, and achieve improved efficiency and obvious effects Effect

Inactive Publication Date: 2004-12-15
BEIJING HUAWEI DIGITAL TECH
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Problems solved by technology

However, this solution can only solve the problem of precise port forwarding in the VLAN of leaf nodes, and cannot solve the problem of precise port forwarding in VLANs of non-leaf nodes.

Method used

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  • IP multicasting precision port repeat method in three layer exchanging

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Embodiment Construction

[0014] Since the forwarding chip only mechanically forwards the data message according to the multicast forwarding item, the accurate forwarding of the multicast data message at the VLAN port depends on the multicast forwarding item in the forwarding chip which can be accurate to the VLAN specific port. The key to generating such multicast forwarding items lies in the maintenance of the multicast routing port mapping table.

[0015] The maintenance of the multicast routing port mapping table first needs to receive the VLAN ID of the multicast protocol message and data message and the specific physical port number under the VLAN. The Layer 3 switch saves its Layer 3 and Layer 2 interface indexes for the received message, and can obtain the corresponding VLAN ID and physical port number according to the Layer 3 interface indexes and the Layer 2 interface indexes.

[0016] Multicast routing port mapping entries are generated in the following situations:

[0017] 1. When the IGMP...

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Abstract

This invention provides a method for accurately forwarding IP multicast port in three layers of exchange including: 1 keeping related VLAN ID for received messages and concrete physical numbers of VLAN, 2 generating and maintaining a multicast rout port image list which stores the multicast rout source address, the target multicast address, input interface VLAN ID and the physical port number and the output interface VLAN ID and physical port number listing 3 sending the multicast route items of quad mode to a forward chip according to the corresponding multicast route port image list items, the chip generates input and output interfaces as the multicast forward item of the concrete physical port under VLAN 4 The forward chip forwards the data message according to the multicast forward items.

Description

Technical field: [0001] The invention belongs to the field of computer network communication, and in particular relates to a method for IP (Internet Protocol) multicast precise port forwarding in three-layer exchange. Background technique: [0002] Existing IP multicast routing protocols, such as PIM-SM (sparse mode of protocol-independent multicast routing protocol) and PIM-DM (dense mode of protocol-independent multicast routing protocol), etc. (this article only uses PIM-SM as an example), Its routing item is a quadruple in the form of (source, group, iifoif). Where source is the IP address of the multicast data source, group is the destination multicast address, iif is the incoming interface, and oif is the outgoing interface list. The multicast protocol sends the routing item to the forwarding chip, so the corresponding forwarding item in the form of a quadruple is maintained in the forwarding chip. When receiving a multicast information message, the forwarding chip s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/46H04L45/74
Inventor 任治国
Owner BEIJING HUAWEI DIGITAL TECH
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