SNR S2989G-48TX-DC — настройка IGMP Snooping и IGMP Proxy для многокастинга [265/553]

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S2989G-24TX Operation Manual

Chapter 5 Multicast Protocol Related Configuration

4-40

⚫ When layer 3 IGMP is disabled, re-enable distributing layer 2 multicast

entries.

By looking up the layer 3 IPMC entries, it can be found that ports can be indicated by the

layer 3 multicast entries. This ensures the IGMP snooping can work in cooperation with

the layer 3 multicast protocols.

5.3.4

IGMP Snooping Troubleshooting

On IGMP Snooping function configuration and usage, IGMP Snooping might not run

properly because of physical connection or configuration mistakes. So the users should

note that:

 Make sure correct physical connection

 Activate IGMP Snooping on whole configuration mode (use ip igmp

snooping)

 Configure IGMP Snooping at VLAN on whole configuration mode ( use ip

igmp snooping vlan <vlan-id>)

 Make sure one VLAN is configured as L2 common checker in same mask,

or make sure configured static mrouter

 Use show ip igmp snooping vlan <vid> command check IGMP Snooping

information

5.4

IGMP Proxy

5.4.1

Introduction to IGMP Proxy

IGMP/MLD proxy which is introduced in rfc4605, is a simplified multicast protocol

running at edge boxes. The edge boxes which runs the IGMP/MLD proxy protocol, does

not need to run complicated multicast routing protocols such as PIM/DVMRP. However

they work with multicast protocol enabled network through IGMP/MLD proxy. They can

simplify the implementation of multicasting on edge devices.

The IGMP/MLD proxy works between the multicast router and the client, it works as

both the multicast host and router. Upstream and downstream ports should be specified in

the IGMP/MLD proxy configuration. The host protocol runs at upstream ports, while the

router protocol runs at downstream ports. The switch collects the join and leave messages

received from downstream ports and forward them to the multicast router through

upstream ports.