Huawei Quidway S6500 Series - Page 410

Command Manual - Multicast Protocol
Quidway S6500 Series Ethernet Switches Chapter 4 IGMP Configuration Commands
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4-11
View
Interface view
Parameter
robust-value: IGMP robust value, number of sending the IGMP group query message
after the IGMP query router receives the IGMP Leave message from the host. It is in
the range of 2 to 5. By default, it is 2.
Description
Using igmp robust-count command, you can set the number of sending the IGMP
group query message after the IGMP query router receives the IGMP Leave message
from the host. Using undo igmp robust-count command, you can restore the default
value.
In the shared network, that is, a 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
sends back the IGMP Membership Report message within the specified maximum
response time interval. If it receives the IGMP Membership Report message within the
defined period (equal to robust-value × seconds), the IGMP query router continue to
maintain the membership of this group. When receiving no IGMP Membership Report
message from any hosts within the defined period, the IGMP query router considers it
as timeout and stops membership maintenance for the group.
This command is only available on the IGMP query router running IGMP v2. For the
host running IGMP v1, this command cannot take effect for the host may not send the
IGMP Leave message when it leaves a group.
For the related command, see igmp lastmember-queryinterval and display igmp
interface.
Example
# Set the robust value at the Vlan-interface 10 as 3.
[Quidway-Vlan-interface10] igmp robust-count 3