3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring IGMP-Related Functions 551
group-specific queries, the maximum response time equals to the IGMP
last-member query interval.
Configuring IGMP timers globally
Follow these steps to configure IGMP timers globally:
Configuring IGMP timers in a VLAN
Follow these steps to configure IGMP timers in a VLAN:
c
CAUTION: In the configuration, make sure that the IGMP general query interval is
larger than the maximum response time for IGMP general queries.
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 will not set that port as a 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
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 IGMP Snooping view igmp-snooping -
Configure the maximum
response time to IGMP
general queries
max-response-time interval Optional
10 seconds by default
Configure the IGMP
last-member query interval
last-member-query-interval
interval
Optional
1 second by default
To do... Use the command... Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure IGMP general
query interval
igmp-snooping
query-interval interval
Optional
60 second by default
Configure the maximum
response time to IGMP
general queries
igmp-snooping
max-response-time interval
Optional
10 seconds by default
Configure the IGMP
last-member query interval
igmp-snooping
last-member-query-interval
interval
Optional
1 second by default
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 {
current-interface |
ip-address }
Optional
0.0.0.0 by default