3Com 7757 Configuration Manual page 459

Configuring IGMP Proxy
Configuring Suppression
on IGMP Host Report
Messages
If you configure IGMP simulated joining in Ethernet port view, the port to be
■
configured must belong to the specified VLAN; otherwise the configuration
does not take effect.
Configuring 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.
Table 368 Configure IGMP proxy
Operation
Enter system view
Enable the multicast routing
protocol
Enter VLAN interface (which is
connected to the external
network) view
Enable PIM-DM on this
interface
Enable the IGMP protocol
Configure IGMP Proxy
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.
■
When a Layer 2 switch receives an IGMP host report message from a host in a
multicast group, the switch will forward the message 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 messages from multiple hosts in a multicast
group.
When the suppression on IGMP host report messages is enabled, the Layer 3
switch will receive only the first IGMP host report message from the hosts in a
Command
system-view
multicast routing-enable
interface Vlan-interface
interface-number
pim dm
igmp enable
igmp proxy Vlan-interface
interface-number
IGMP Configuration Tasks
Description
-
Required
-
-
Required
By default, if the IP multicast
routing protocol is enabled
globally, IGMP is enabled on
all the layer-3 interfaces
automatically.
Required
By default, the IGMP Proxy
feature is disabled.
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