96
View
Interface view
Default level
2: System level
Parameters
robust-value: IGMP querier's robustness variable, in the range of 2 to 5.
Description
Use igmp robust-count to configure the IGMP querier's robustness variable on the current interface.
Use undo igmp robust-count to restore the default.
By default, the IGMP querier's robustness variable is 2.
The IGMP querier's robustness variable defines the maximum number of attempts for transmitting IGMP
general queries, group-specific queries or group-and-source-specific queries in case of packet loss
because of network problems. A greater value of the robustness variable makes the IGMP querier more
robust, but results in a longer multicast group timeout time.
The IGMP querier's robustness variable determines the following values:
• The default number of general queries that the IGMPv1/v2/v3 querier sends on startup
• The number of IGMP group-specific queries that the IGMPv2 querier sends after receiving an IGMP
leave message
• The number of IGMP group-and-source-specific queries that the IGMPv3 querier sends after
receiving an IGMP report that tells relation changes between IPv6 multicast groups and IPv6
multicast sources
Related commands: display igmp interface, igmp last-member-query-interval, igmp
startup-query-count, igmp timer other-querier-present, igmp timer query, and robust-count.
Examples
# Set the IGMP querier's robustness variable to 3 on VLAN-interface 100.
<Sysname> system-view
[Sysname] interface vlan-interface 100
[Sysname-Vlan-interface100] igmp robust-count 3
igmp send-router-alert
Syntax
igmp send-router-alert
undo igmp send-router-alert
View
Interface view
Default level
2: System level
Parameters
None
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