3Com Switch 8800 Advanced Software V5 Configuration Guide

532 CHAPTER 40: IGMP CONFIGURATION
■ For IGMP general queries, you can configure the maximum response time to fill
their Max Response time field.
■ For IGMP group-specific queries, you can configure the IGMP last-member
query interval to fill their Max Response time field. Namely, for IGMP
group-specific queries, the maximum response time equals the IGMP
last-member query interval.
When multiple multicast routers exist on the same subnet, the IGMP querier is
responsible for sending IGMP queries. If a non-querier router receives no IGMP
query from the querier before the "other querier present interval" timer expires, it
will assume the querier to have expired and a new querier election process is
launched; otherwise, the non-querier router will reset its "other querier present
interval" timer.
Configuring IGMP timers globally
Follow these steps to configure IGMP timers globally:
Configuring IGMP timers for an interface
Follow these steps to configure IGMP timers for an interface:
To do... Use the command... Description
Enter system view system-view -
Enter IGMP view igmp -
Configure IGMP general
query interval
timer query interval Optional
60 seconds by default
Configure the maximum
response time for 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
Configure the IGMP
last-member query count
robust-count robust-value Optional
2 times by default
Configure the other querier
present interval
timer
other-querier-present
interval
Optional
For the system default, see
"Note" below
To do... Use the command... Description
Enter system view system-view -
Enter VLAN/POS interface
view
interface interface-type
interface-number
-
Configure IGMP general
query interval
igmp timer query interval Optional
60 seconds by default
Configure the maximum
response time for IGMP
general queries
igmp max-response-time
interval
Optional
10 seconds by default
Configure the IGMP
last-member query interval
igmp
lastmember-queryinterval
interval
Optional
1 second by default
Configure the IGMP
last-member query count
igmp robust-count
robust-value
Optional
2 times by default