H3C Technologies H3C S12500-X Series Switches - Manual (Page 150)

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Enabling MLD fast-leave processing
In some applications, such as ADSL dial-up networking, only one multicast receiver host is attached to an
interface of the MLD querier. To allow fast response to the MLD done messages of the host when it
switches frequently from one IPv6 multicast group to another, you can enable fast-leave processing on the
MLD querier.
With MLD fast-leave processing enabled, after receiving an MLD done message from a host, the MLD
querier sends a leave notification to the upstream immediately without first sending MLD
multicast-address-specific queries. This reduces leave latency and preserves the network bandwidth.
To enable MLD fast-leave processing:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable MLD fast-leave
processing. mld fast-leave [ group-policy
acl6-number ] By default, the MLD fast-leave
processing is disabled.
Displaying and maintaining MLD
CAUTION:
The reset mld group command might cause IPv6 multicast data transmission failures.
Execute display commands in any view and reset commands in user view.
Task Command
Display MLD group information.
display mld [ vpn-instance vpn-instance-name ] group
[ ipv6-group-address | interface interface-type interface-number ] [ static |
verbose ]
Display MLD information.
display mld [ vpn-instance vpn-instance-name ] interface [ interface-type
interface-number ] [ verbose ]
Remove all the dynamic group
entries of the specified MLD group
or all MLD groups.
reset mld [ vpn-instance vpn-instance-name ] group { all | interface
interface-type interface-number { all | ipv6-group-address [ prefix-length ]
[ ipv6-source-address [ prefix-length ] ] } }
NOTE:
The reset mld group command cannot remove static MLD group entries.
MLD configuration examples
Network requirements
As shown in Figure 43 :