Igmp Proxy - H3C S7500 Series Operation Manual

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Operation Manual – Multicast

H3C S7500 Series Ethernet Switches

The data from the multicast source reaches the IGMP router over the multicast

routes. If there are receivers in the network connected to the IGMP router, the data

will be forwarded to this network segment and the receiver hosts receive the data.

IGMP leave messages are not defined in IGMPv1. When a host leaves a multicast

group, the multicast router knows that a host has left the group only when the query

message times out.

When all the hosts in a network segment have left the multicast group, the branch

corresponding to the related network segment is pruned from the multicast tree.

6.1.4 IGMP Proxy

A lot of leaf networks (leaf domains) are involved in the application of a multicast routing

protocol (PIM-DM for example) over a large-scaled network. It is a hard work to

configure and manage these leaf networks.

To reduce the workload of configuration and management without affecting the

multicast connection of leaf networks, you can configure an IGMP Proxy in a Layer 3

switch in the leaf network (Switch B in the figure). The Layer 3 switch will then forward

IGMP join or IGMP leave messages sent by the connected hosts. After the

configuration of IGMP Proxy, the leaf switch is no longer a PIM neighbor but a host for

the external network. Only when the Layer 3 switch has directly connected members,

can it receive the multicast data of corresponding groups.

Figure 6-2 Diagram for IGMP Proxy

Configure Switch B as follows:

Enable multicast routing on VLAN interface 1 and VLAN interface 2, and then

configure the PIM protocol on it. And configure the IGMP protocol on

VLAN-interface 1 at the same time.

IGMP join/leave message

General / group-specific query

is an IGMP Proxy diagram for a leaf network.

General/group-specific

IGMP join/leave

Chapter 6 IGMP Configuration

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