Configuring fast leave processing, Configuring fast leave processing globally – H3C Technologies H3C S3100 Series Switches User Manual

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Each simulated host is equivalent to an independent host. For example, when receiving an MLD

query, the simulated host corresponding to each configuration responds respectively.

Unlike a static member port, a port configured as a simulated member host will age out like a

dynamic member port.

Configuring Fast Leave Processing

The fast leave processing feature allows the switch to process MLD done messages in a fast way. With

the fast leave processing feature enabled, when receiving an MLD done message on a port, the switch

immediately removes that port from the outgoing port list of the forwarding table entry for the indicated

IPv6 multicast group. Then, when receiving MLD done multicast-address-specific queries for that IPv6

multicast group, the switch will not forward them to that port.

In VLANs where only one host is attached to each port, fast leave processing helps improve bandwidth

and resource usage. However, if fast leave processing is enabled on a port to which more than one host

is attached, when one host leaves a multicast group, the other hosts attached to the port and interested

in the same multicast group will fail to receive multicast data for that group. Therefore, if the function of

dropping unknown IPv6 multicast traffic is already enabled on the switch or in the VLANs, the fast leave

processing function should not be enabled.

Configuring fast leave processing globally

Follow these steps to configure fast leave processing globally:

To do...

Use the command...

Remarks

Enter system view

system-view

—

Enter MLD snooping view

mld-snooping

—

Enable fast leave processing

fast-leave [ vlan vlan-list ]

Required

Disabled by default

Configuring fast leave processing on a port or a group of ports

Follow these steps to configure fast leave processing on a port or a group of ports: