Operation Manual - Multicast Protocol
Quidway S6500 Series Ethernet Switches Chapter 5 IGMP Configuration
Huawei Technologies Proprietary
5-4
Table 5-3 Configuring query interval
Operation Command
Configure query interval
igmp timer query seconds
Restore the default query interval
undo igmp timer query
When there are multiple multicast routers on a network segment, the querier is
responsible for sending IGMP query messages to all the hosts on the LAN.
By default, the interval is 60 seconds.
5.2.5 Configuring Interval and Number of Querying IGMP Packets
On the shared network, it is the query router (querier) that maintains IGMP membership
on the interface. When an IGMP querier receives an IGMP Leave Group message from
a host, the last member query interval can be specified for Group-Specific Queries.
z The host sends the IGMP Leave message.
z Upon receiving the message, IGMP querier sends the designated group IGMP
query message for specified times (defined by the robust-value in igmp
robust-count, with the default value as 1 second) and at a time interval (defined
by the seconds in igmp lastmember-queryinterval, with the default value as 2).
z When other hosts reciver the message from the IGMP querier and are interested
in this group, they return the IGMP Memberhsip Report message within the
defined maximum response time.
z If IGMP querier receives the report messges from other hosts within the period
equal to robust-value × seconds, it continues memberhship maintenance for this
group.
z If it receives no report message from any other host within this peroid, it reckens
this as timeout and ends mebership maintenance for this group.
This command can be used only when the querier runs IGMP version 2, since a host
running IGMP Version 1 does not send IGMP Leave Group message when it leaves a
group.
Please perform the following configurations in interface view.
I. Configuring interval for querying IGMP packets
Table 5-4 Configuring interval for querying IGMP packets
Operation Command
Configure interval for querying IGMP
packets
igmp lastmember-queryinterval seconds
Restore te default query interval
undo igmp lastmember-queryinterval
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