HP MSR1002-4 Configuration Manual page 83

•
To avoid frequent IGMP querier changes, set the IGMP other querier present timer greater than
the IGMP general query interval. In addition, configure the same IGMP other querier present
timer for all IGMP routers on the same subnet.
•
To avoid mistakenly deleting multicast receivers, set the IGMP general query interval greater
than the maximum response time for IGMP general queries.
•
To speed up the response to IGMP queries and avoid simultaneous timer expirations that cause
IGMP report traffic bursts, set an appropriate maximum response time.
For IGMP general queries, the maximum response time is set by the max-response-time

command.
For IGMP group-specific queries and IGMP group-and-source-specific queries, the

maximum response time equals the IGMP last member query interval.
•
The following configurations take effect only on the devices that run IGMPv2 and IGMPv3:
Maximum response time for IGMP general queries.

IGMP last member query interval.

IGMP last member query count.

IGMP other querier present interval.

Configuring the IGMP query and response parameters globally
Step
1. Enter system view.
2. Enter IGMP view.
3. Set the
robustness variable.
4. Set the IGMP startup query
interval.
5. Set the IGMP startup query
count.
6. Set the IGMP general query
interval.
7. Set the IGMP last member
query interval.
8. Set the IGMP last member
query count.
9. Set the maximum response
time
queries.
10. Set the IGMP other querier
present timer.
IGMP querier's
for IGMP general
Command
system-view
igmp [ vpn-instance
vpn-instance-name ]
robust-count count
startup-query-interval interval
startup-query-count count
query-interval interval
last-member-query-interval
interval
last-member-query-count count
max-response-time time
other-querier-present-interval
interval
74
Remarks
N/A
N/A
By default, the IGMP querier's
robustness variable is 2.
By default, the IGMP startup
query interval equals one quarter
of the IGMP general
interval.
By default, the IGMP startup
query count equals the IGMP
querier's robustness variable.
By default, the IGMP general
query interval is 125 seconds.
By default, the IGMP last member
query interval is 1 second.
By default, the IGMP last member
query count equals the IGMP
querier's robustness variable.
By default, the
response time for IGMP general
queries is 10 seconds.
By default, the IGMP other querier
present timer is calculated by
using the following
[ IGMP general query interval ] ×
[ IGMP robustness variable ] +
[ maximum response time for
IGMP general queries ] / 2.
query
maximum
formula: