3Com S7902E, Configuration Manual

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1-17
Configuring Source IP Address of IGMP Queries
Upon receiving an IGMP query whose source IP address is 0.0.0.0 on a port, the switch does not enlist
that port as a dynamic router port. This may prevent multicast forwarding entries from being correctly
created at the data link layer and cause multicast traffic forwarding failure in the end. When a Layer 2
device acts as an IGMP-Snooping querier, to avoid the aforesaid problem, you are commended to
configure a non-all-zero IP address as the source IP address of IGMP queries.
Follow these steps to configure source IP address of IGMP queries:
To do... Use the command... Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —
Configure the source address
of IGMP general queries igmp-snooping general-query source-ip
{ ip-address | current-interface }
Optional
0.0.0.0 by default
Configure the source IP
address of IGMP group-specific
queries
igmp-snooping special-query source-ip
{ ip-address | current-interface }
Optional
0.0.0.0 by default
The source address of IGMP query messages may affect IGMP querier selection within the segment.
Configuring IGMP Snooping Proxying
Configuration Prerequisites
Before configuring IGMP snooping Proxying in a VLAN, enable IGMP snooping in the VLAN and
prepare the following data:
z
Source IP address for the IGMP reports sent by the proxy
z
Source IP address for the IGMP leave messages sent by the proxy
Enabling IGMP Snooping Proxying
The IGMP snooping Proxying function works on a per-VLAN basis. After you enable the function in a
VLAN, the device works as the IGMP snooping proxy for the downstream hosts and upstream router in
the VLAN.
Follow these steps to enable IGMP snooping Proxying in a VLAN:
To do... Use the command... Remarks
Enter system view system-view —
Enter VLAN view
vlan vlan-id
—
Enable IGMP snooping
Proxying in the VLAN
igmp-snooping proxying
enable
Required
Disabled by default.