Configuring fast leave processing
The fast leave processing feature enables the switch to process MLD done messages quickly. When the fast leave processing feature is enabled and the switch receives 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, 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:
To do... | Use the command... | Remarks |
|---|---|---|
Enter system view | system-view | — |
Enter Ethernet interface/Layer 2 aggregate interface view or port group view | interface interface-type interface-number | Required Use either approach |
port-group manual port-group-name | ||
Enable fast leave processing | mld-snooping fast-leave [ vlan vlan-list ] | Required Disabled by default |