H3C Technologies H3C S12500-X Series Switches - Manual (Page 66)

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Enabling IGMP fast-leave processing
In some applications, such as ADSL dial-up networking, only one multicast receiver host is attached to an
interface of the IGMP querier. To allow fast response to the leave messages of the host when it switches
frequently from one multicast group to another, you can enable fast-leave processing on the IGMP
querier.
With IGMP fast-leave processing enabled, after receiving an IGMP leave message from a host, the IGMP
querier directly sends a leave notification to the upstream without sending IGMP group-specific queries
or IGMP group-and-source-specific queries. This reduces leave latency and preserves the network
bandwidth.
The IGMP fast-leave processing configuration is effective only if the device is running IGMPv2 or
IGMPv3.
To enable IGMP fast-leave processing:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable IGMP fast-leave
processing. igmp fast-leave [ group-policy
acl-number ] By default, IGMP fast-leave
processing is disabled.
Displaying and maintaining IGMP
CAUTION:
The reset igmp group command might cause multicast data transmission failures.
Execute display commands in any view and reset commands in user view.
Task Command
Display IGMP group information.
display igmp [ vpn-instance vpn-instance-name ] group [ group-address |
interface interface-type interface-number ] [ static | verbose ]
Display IGMP information.
display igmp[ vpn-instance vpn-instance-name ] interface [ interface-type
interface-number ] [ verbose ]
Clear all the dynamic IGMP group
entries of the specified IGMP group
or all IGMP groups.
reset igmp [ vpn-instance vpn-instance-name ] group { all | interface
interface-type interface-number { all | group-address [ mask { mask |
mask-length } ] [ source-address [ mask { mask | mask-length } ] ] } }
NOTE:
The reset igmp group command cannot remove static IGMP group entries.