HP A8800 Configuration Manual page 107

For IGMP group-specific queries and IGMP group-and-source-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 when the other querier
present timer expires, it considers that the querier has failed and starts a new querier election. Otherwise,
the non-querier router resets the other querier present timer.
Configuration guidelines
Make sure that the other querier present interval is greater than the IGMP general query interval.
•
Otherwise the IGMP querier might change frequently on the network.
Make sure that the IGMP general query interval is greater than the maximum response time for
•
IGMP general queries. Otherwise, multicast group members might be wrongly removed.
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.
Configuration procedure
To configure 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.
To configure IGMP query and response parameters on an interface:
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
95
Remarks
N/A
N/A
2 by default.
By default, the startup query
interval is 1/4 of the "IGMP
general query interval".
By default, the startup query count
is set to 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.