SNR S2989G-48TX-RPS — настройка и устранение неполадок IGMP Proxy и Multicast VLAN [270/553]

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S2989G-24TX Operation Manual

Chapter 5 Multicast Protocol Related Configuration

4-45

Multicast Configuration:

Suppose the server provides programs through the multicast address 224.1.1.1, and

some hosts subscribe that program on the edge of the network. The host reports their

IGMP multicast group membership to Switch 2 and Switch 3 through downstream ports.

Switch 2 and Switch 3 then aggregate and forward them to Switch 1 which then forwards

the information to multicast router. When multicast dataflow arrives, the IGMP Proxy

enabled switches re-distribute the group membership through upstream ports and

downstream ports. When the multicast router receives the multicast dataflow from IGMP

proxy, it will consider the multicast data source is directly connected to the router, and

determine the identity of DR and ORIGINATOR. The multicast dataflow will be

redistributed according to the PIM protocol.

5.4.4

IGMP Proxy Troubleshooting

When IGMP Proxy function configuration and usage, IGMP Proxy might not run

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

note that:

 Make sure physical connection correctly;

 Activate IGMP Proxy on whole Global mode (use ip igmp proxy);

 Make sure configure one upstream port and at least one downstream port under

interface configuration mode (Use ip igmp proxy upstream, ip igmp proxy

downstream);

 Use show ip igmp proxy command to check if the IGMP Proxy information is

correct.

If the IGMP Proxy problem remains unsolved, please use debug IGMP Proxy and

other debugging command and copy the DEBUG message within three minutes, send the

recorded message to the technical service center of our company.

5.5

Multicast VLAN

5.5.1

Introductions to Multicast VLAN

Based on current multicast order method, when orders from users in different VLAN,

each VLAN will copy a multicast traffic in this VLAN, which is a great waste of the

bandwidth. By configuration of the multicast VLAN, we add the switch port to the multicast

VLAN, with the IGMP Snooping/MLD Snooping functions enabled, users from different