Configuring Fast Leave Processing - 3Com S7906E Configuration Manual

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...
Enter system view
Enter MLD snooping view
Enable fast leave processing
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:
To do...
Enter system view
Enter Ethernet port/ONU
port/Layer 2 aggregate
interface view or port group
view
Enable fast leave processing
Use the command...
system-view
mld-snooping
fast-leave [ vlan vlan-list ]
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
mld-snooping fast-leave
[ vlan vlan-list ]
1-14
Remarks
—
—
Required
Disabled by default
Remarks
—
Required
Use either approach
Required
Disabled by default