H3C Technologies H3C S10500 Series Switches - Manual (Page 282)

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Follow these steps to configure simulated joining:
To do... Use the command... Remarks
Enter system view system-view —
Enter Layer 2 Ethernet interface
view, Layer 2 aggregate interface
view, port group view
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface interface-type
interface-number
Enter port group view:
port-group manual
port-group-name
Required
Use either command
Configure simulated joining
mld-snooping host-join
ipv6-group-address [ source-ip
ipv6-source-address ] vlan vlan-id
Required
Not configured by default.
NOTE:
•
A simulated host is equivalent to an independent host. For example, when a simulated member host
receives an MLD query, it gives a response separately.
• Unlike a static member port, a port that you configure as a simulated member host ages 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 the switch receives MLD multicast-address-specific queries for that IPv6
multicast group, it does 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 that connects to more than
one host, 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, you should not
enable the fast-leave processing function.
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: