3Com Switch 7750 Configuration Guide Guide

416 CHAPTER 43: IGMP CONFIGURATION
Configuring IGMP Proxy Configure IGMP Proxy
You can configure IGMP proxy to reduce the workload of configuration and
management of leaf networks without affecting the multicast connections of the
leaf network.
After the configuration of IGMP Proxy on the Layer 3 switch of the leaf network,
the leaf Layer 3 switch is just 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.
c
CAUTION:
■ Both the multicast routing protocol and the IGMP protocol must be enabled on
the proxy interface.
■ You must enable PIM DM on the interface before configuring the igmp proxy
command. Otherwise, the IGMP Proxy feature does not take effect.
■ Only one IGMP proxy interface can be configured for one interface.
Configuring Suppression
on IGMP Host Report
Packet
When a Layer 2 switch receives an IGMP host report packet from a host in a
multicast group, the switch will forward the packet to the Layer 3 switch port
connecting to it. If there are multiple hosts in a multicast group, the Layer 3 switch
will receive the same IGMP host report packets from multiple hosts in a multicast
group.
Configure router ports to join
a multicast group
igmp host-join
group-address vlan vlan-id
Optional
By default, the router port
does not join in any multicast
group.
Table 332 Configure router ports to join the specified multicast group
Operation Command Description
Tabl e 333 Configure IGMP Proxy
Operation Command Description
Enter system view system-view -
Enable the multicast routing
protocol
multicast routing-enable Required
Enter VLAN interface (which is
connected to the external
network) view
interface Vlan-interface
interface-number
-
Enable PIM-DM on this
interface
pim dm -
Enable the IGMP protocol igmp enable
Required
By default, if the IP multicast
routing protocol is enabled
globally, IGMP is enabled on
all the layer-3 interfaces
automatically.
Configure IGMP Proxy
igmp proxy Vlan-interface
interface-number
Required
By default, the IGMP Proxy
feature is disabled.