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Configuring IGMP 177
If other hosts, which are interested in the specified group, receive the IGMP query
message from the IGMP query router, they send back the IGMP Membership
Report message within the specified maximum response time interval. If the IGMP
query router receives the IGMP Membership Report message within the defined
period (equal to robust-value seconds), it continues to maintain the membership
of this group. When the IGMP query router receives no IGMP Membership Report
messages from any host within the defined period, it perceives a timeout and
stops membership maintenance for the group.
Perform the following configuration in VLAN interface view.
By default, the interval is 1 second.
This command is only available on the IGMP query router running IGMP v2. For
the host running IGMP v1, this command cannot take effect, because the host
may not send the IGMP Leave message when it leaves a group.
Configuring the Interval for Sending IGMP Group-Specific Query Packet
In a shared network where the same network segment including multiple hosts
and multicast routers, the query router is responsible for maintaining the IGMP
group membership on the interface.
When the IGMP v2 host leaves a group, it sends a IGMP Leave message. When
receiving the IGMP Leave message, IGMP query router must send the IGMP group
query message for specified times (by the robust-value parameter in the igmp
robust-count command, with default value as 2) in a specified time interval (by
the seconds parameter in the igmp lastmember-queryinterval command, with
default value as 1 second).
If other hosts, which are interested in the specified group, receive the IGMP query
message from the IGMP query router, they will send back the IGMP Membership
Report message within the specified maximum response time interval. If the IGMP
query router receives the IGMP Membership Report message within the defined
period (equal to robust-value seconds), it continues to maintain the membership
of this group. When the IGMP query router receives no IGMP Membership Report
messages from any hosts within the defined period, it perceives a timeout and
stops membership maintenance for the group.
Perform the following configuration in VLAN interface view.
Table 10 Configure The Interval of Sending IGMP Group-Specific Query Packet
Operation Command
Configure the interval of sending IGMP
Group-Specific Query packet
igmp lastmember-queryinterval seconds
Restore the interval of sending IGMP
Group-Specific Query packet to the default
value
undo igmp lastmember-queryinterval
Table 11 Configure the Times of Sending IGMP Group-Specific Query Packet
Operation Command
Configure the times of sending IGMP
Group-Specific Query packet
igmp robust-count robust-value