HP MSR ASM Configuration Manual page 38

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 when the other querier
present interval expires, it considers that the querier as having failed and starts a new querier election.
Otherwise, the non-querier router resets the other querier present timer.
Configuration guidelines
To avoid frequent IGMP querier changes, set the other querier present interval greater than the
•
IGMP general query interval.
To avoid incorrect multicast group member removals, set the IGMP general query interval greater
•
than the maximum response time for IGMP general queries.
• The configurations of the maximum response time for IGMP general queries, the IGMP last member
query interval and the IGMP other querier present interval are effective only for IGMPv2 and
IGMPv3.
Configuring IGMP query and response parameters globally
Step
1. Enter system view.
2. Enter public network IGMP
view or VPN instance IGMP
view.
3. Configure the IGMP querier's
robustness variable.
4. Configure the startup query
interval.
5. Configure the startup query
count.
6. Configure the IGMP general
query interval.
7. Configure the maximum
response time for IGMP
general queries.
8. Configure the IGMP
last-member query interval.
9. Configure the other querier
present interval.
Command
system-view
igmp [ vpn-instance
vpn-instance-name ]
robust-count robust-value
startup-query-interval interval
startup-query-count value
timer query interval
max-response-time interval
last-member-query-interval
interval
timer other-querier-present
interval
26
Remarks
N/A
N/A
2 by default.
A higher robustness variable
makes the IGMP querier more
robust, but results in longer
multicast group timeout time.
By default, the startup query
interval is one-quarter of the "IGMP
general query interval."
By default, the startup query count
is the same as the IGMP querier's
robustness variable.
60 seconds by default.
10 seconds by default.
1 second by default.
By default, the other querier
present interval is [ IGMP general
query interval ] × [ IGMP
robustness variable ] + [ maximum
response time for IGMP general
queries ] / 2.