H3C S5500-EI - Configuring IGMP Fast-Leave Processing

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Configuring IGMP fast-leave processing
In some applications, such as ADSL dial-up networking, only one multicast receiver host is attached to a
port 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 IGMP 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. Thus, the leave latency is reduced on one hand, and the
network bandwidth is saved on the other hand.
Configuration guidelines
• The IGMP fast-leave processing configuration is effective only if the switch is running IGMPv2 or
IGMPv3.
• The IGMP fast-leave processing configuration is effective on Layer 3 interfaces other than VLAN
interfaces, including Layer 3 Ethernet ports, Layer 3 aggregate interfaces, and Tunnel interfaces.
Configuration procedure
To configure IGMP fast-leave processing globally:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network IGMP
view or VPN instance IGMP
view.
igmp [ vpn-instance
vpn-instance-name ]
N/A
3. Configure IGMP fast-leave
processing.
fast-leave [ group-policy
acl-number ]
Disabled by default
To configure IGMP fast-leave processing on an interface:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure IGMP fast-leave
processing.
igmp fast-leave [ group-policy
acl-number ]
Disabled by default
IGMP fast-leave processing is implemented by IGMP snooping. For more information, see "Configuring
IGMP snooping."