Configuring The Present Time Of Igmp Querier - H3C S9500 Series Operation Manual

Operation Manual – Multicast Protocol
H3C S9500 Series Routing Switches
I. Configuring interval for querying IGMP packets
Table 5-4 Configuring interval for querying IGMP packets
Configure interval for querying
IGMP packets
Restore the default query interval
By default, the interval is 1 second.
II. Configuring the number of last member querying
Table 5-5 Configuring the number of last member querying
Configure number of last member querying
Restore the default number of querying
By default, an IGMP group-specific query message is sent for twice.

5.2.6 Configuring the Present Time of IGMP Querier

On shared network, namely a network segment where multiple multicast routers exist,
a query router (querier for short) sends query messages on the interface regularly. If a
non-query router fails to receive messages from the querier within a period of time, it
will deem that the querier has failed and take over the job of the original querier.
In the IGMP V1 version, the querier selection is determined by the multicast routing
protocol; in the IGMP V2 version, the router with the lowest IP address on a shared
network segment acts as the querier.
The IGMP querier presence time is the period of time before the router takes over as
the querier sending query messages, after the previous querier has stopped doing so.
Perform the following configuration in VLAN interface view.
Table 5-6 Configuring the present time of IGMP querier
Change the present time of IGMP
querier
Restore the default value
By default, the value is twice the IGMP query message interval, namely 120 seconds.
Operation
Operation
Operation
Command
igmp lastmember-queryinterval seconds
undo igmp lastmember-queryinterval
igmp robust-count robust-value
undo igmp robust-count
igmp timer
seconds
undo igmp timer other-querier-present
5-7
Chapter 5 IGMP Configuration
Command
Command
other-querier-present