H3C Technologies H3C S12500 Series Switches - Manual (Page 42)

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Step Command Remarks
5. Set the maximum response
delay for IGMP general
queries.
igmp-snooping
last-member-query-interval interval
1 second by default.
Configuring source IP addresses for IGMP queries
After a switch receives an IGMP query whose source IP address is 0.0.0.0 on a port, it does not enlist that
port as a dynamic router port. This might prevent multicast forwarding entries from being correctly
created at the data link layer and eventually cause multicast traffic forwarding to fail. To avoid this
problem, when a Layer 2 switch acts as the IGMP snooping querier, H3C recommends that you configure
a non-all-zero IP address as the source IP address of IGMP queries.
IMPORTANT:
Changing the source address of IGMP queries might affect the IGMP querier election within the subnet.
To configure source IP addresses for IGMP queries:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VLAN view. vlan vlan-id N/A
3. Configure the source IP
address for IGMP general
queries.
igmp-snooping general-query source-ip
{ ip-address | current-interface }
0.0.0.0 by default.
4. Configure the source IP
address for IGMP
group-specific queries.
igmp-snooping special-query source-ip
{ ip-address | current-interface }
0.0.0.0 by default.
Configuring IGMP snooping proxying
Before you configure IGMP snooping proxying in a VLAN, complete the following tasks:
• Enable IGMP snooping for the VLAN.
• Determine the source IP address for the IGMP reports sent by the proxy.
• Determine the source IP address for the IGMP leave messages sent by the proxy.
Enabling IGMP snooping proxying
The IGMP snooping proxying function operates on a per-VLAN basis. After you enable the function in a
VLAN, the device operates as the IGMP snooping proxy for the downstream hosts and upstream router
in the VLAN.
To enable IGMP snooping proxying in a VLAN:
Step Command Remarks
1. Enter system view. system-view N/A