Method and device for sharing layer 2 multicast forwarding table

Abstract

The invention discloses a method and a device for sharing a layer 2 multicast forwarding table, which comprises: configuring the table item parameters of the layer 2 multicast forwarding table of Internet group management protocol snooping and multicast listener discovery snooping and allowing the Internet group management protocol snooping and the multicast listener discovery snooping to share the layer 2 multicast forwarding table; maintaining a unified shared layer 2 multicast forwarding index table for the Internet group management protocol snooping and the multicast listener discovery snooping; and uniformly managing layer 2 multicast forwarding related to the Internet group management protocol snooping and the multicast listener discovery snooping according to the configured layer 2 multicast forwarding table and the shared layer 2 multicast forwarding index table. The method and the device of the invention can support the coexistence of IPv4 and IPv6 layer 2 multicast in double stack equipment and improve the utilization rate of equipment resources.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for realizing a shared two-layer multicast forwarding table. Background technique [0002] IP multicast technology realizes efficient point-to-multipoint data transmission in IP network. Because multicast can effectively save network bandwidth and reduce network load, it is widely used in real-time data transmission, multimedia conference, data copy, game and simulation, etc. have a wide range of applications. [0003] In a three-layer multicast network, there are two protocols for maintaining multicast groups and multicast membership: IGMP (Internet Group Management Protocol) in IPv4 (Internet Protocol Version 4) and IPv6 ( MLD (Multicast Listener Discovery, Multicast Listener Discovery Protocol) in Internet Protocol Version 6). IGMP and MLD are multicast implemented at the network layer. They are called layer-3 multicast member management protocols. They run on l...

AI Technical Summary

Problems solved by technology

[0006] When the system supports IPv4 and IPv6 dual protocol stacks, storage space needs to be reserved for IGMP snooping and MLDsnooping respectively, that is, two layer-2 multicast forwarding tables need to be maintained, and the device needs to reserve storage space for the two layer-2 multicast forwarding tables Space, limit the capacity of each Layer 2 multicast forwarding table

Due to the different application scenarios of network devices, it is impossible to provide a reasonable allocation scheme for Layer 2 multicast forwarding tables to meet the requirements of IGMP snooping and MLD snooping in all application scenarios

Therefore, it is difficult to make full use of the Layer 2 multicast forwarding table.

In the most extreme case, there are only IGMP snooping multicast entries on the network devices supporting IPv4 and IPv6 dual protocol stacks, but there are no MLD snooping multicast entries at all, so the Layer 2 multicast forwarding table reserved for MLD snooping All storage resources will be wasted; conversely, if there are only multicast entries for MLD snooping on the network device, then all storage resources reserved for the Layer 2 multicast forwarding table for IGMP snooping will also be wasted

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