R3303-HP HSR6800 Routers IP Multicast Command Reference

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robust-count (IGMP view)
Use robust-count to configure the IGMP querier's robustness variable globally.
Use undo robust-count to restore the default.
Syntax
robust-count robust-value
undo robust-count
Default
The IGMP querier's robustness variable is 2.
Views
Public network IGMP view, VPN instance IGMP view
Default command level
2: System level
Parameters
robust-value: Specifies an IGMP querier's robustness variable in the range of 2 to 5.
Usage guidelines
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 due to
network problems. A higher robustness variable makes the IGMP querier more robust, but results in
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 means relation changes between IPv6 multicast groups and IPv6
multicast sources
Examples
# Set the IGMP querier's robustness variable to 3 globally on the public network.
<Sysname> system-view
[Sysname] igmp
[Sysname-igmp] robust-count 3
# Set the IGMP querier's robustness variable to 3 globally in VPN instance mvpn.
<Sysname> system-view
[Sysname] igmp vpn-instance mvpn
[Sysname-igmp-mvpn] robust-count 3
Related commands
• display igmp interface
• igmp robust-count
• last-member-query-interval