H3C Technologies H3C S12500 Series Switches - Manual (Page 111)

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With 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 takes effect only if the switch is running IGMPv2 or
IGMPv3.
• The fast-leave command in IGMP view takes effect only on Layer 3 interfaces except VLAN
interfaces.
• To implement IGMP fast-leave on VLAN interfaces, use the igmp-snooping fast-leave command or
fast-leave (IGMP-snooping view).
Configuration procedure
To configure IGMP fast-leave processing globally:
Step 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:
Step 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.
Enabling the IGMP host tracking function
With the IGMP host tracking function, the switch can record the information of the member hosts that are
receiving multicast traffic, including the host IP address, running duration, and timeout time. You can
monitor and manage the member hosts according to the recorded information.
Enabling the IGMP host tracking function globally
Step 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