3com 8807 Reference Guide

robust-value: IGMP robust value, number of times the IGMP query router sends 
IGMP group query message after it receives the IGMP Leave message from the 
host. the value range is 2 to 5. The default value is 2.

Use the igmp robust-count command to set the number of times the IGMP 
query router sends IGMP group query message after it receives the IGMP Leave 
message from the host.

Use the undo igmp robust-count command to restore the default value.

Related commands: igmp lastmember-queryinterval, display igmp interface.

# Set the robust value at the Vlan-interface 10 to 3.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z.

 

[SW8800]interface vlan-interface 10

 

[3Com-Vlan-interface10] igmp robust-count 3 

igmp timer other-querier-present seconds

Interface view

seconds: IGMP querier present timer value in second ranging from 1 to 131070. 
By default, the value is twice the value of IGMP query message interval, i.e., 120 
seconds.

Use the igmp timer other-querier-present command to configure the timer of 
presence of the IGMP querier.

Use the undo igmp timer other-querier-present command to restore the 
default value.

On a shared network, i.e., there are multiple multicast routers on the same 
network segment, the query router (querier for short) takes charge of sending 
query messages periodically on the interface. If other non-queriers receive no 
query messages within the valid period, the router will consider the previous query 
to be invalid and the router itself becomes a querier.

In IGMP version 1, the selection of a query is determined by the multicast routing 
protocol. In IGMP version 2, the router with the smallest IP address on the shared 
network segment acts as the querier.

Related command: igmp timer query and display igmp interface.