Enabling Fast-Leave Processing - HP A8800 Configuration Manual

NOTE:
Unlike a static member port, a port that you configure as a simulated member host ages out like a dynamic
member port.

Enabling fast-leave processing

The fast-leave processing feature enables the router to process MLD done messages quickly. After the
fast-leave processing feature is enabled, when the router receives an MLD done message on a port, it
immediately removes that port from the forwarding entry for the multicast group specified in the message.
Then, when the router receives MLD multicast-address-specific queries for that multicast group, it does not
forward them to that port.
On a port that has only one host attached, you can enable fast-leave processing to save bandwidth and
resources. However, on a port that has multiple hosts attached, you should not enable fast-leave
processing if you have enabled dropping unknown IPv6 multicast data globally or for the port.
Otherwise, if a host on the port leaves an IPv6 multicast group, the other hosts attached to the port in the
same IPv6 multicast group cannot receive the IPv6 multicast data for the group.
Enabling fast-leave processing globally
Step
1. Enter system view.
2. Enter MLD snooping view.
3. Enable fast-leave processing.
Enabling fast-leave processing on a port
Step
1. Enter system view.
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view or
enter port group view.
3. Enable fast-leave processing.
Disabling a port from becoming a dynamic router port
The following problems exist in a multicast access network:
Upon receiving an MLD general query or IPv6 PIM hello message from a connected host, a router
•
port becomes a dynamic router port. Before its timer expires, this dynamic router port will receive all
Command
system-view
mld-snooping
fast-leave [ vlan vlan-list ]
Command
system-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
mld-snooping fast-leave [ vlan
vlan-list ]
297
Remarks
N/A
N/A
Disabled by default.
Remarks
N/A
Use either command.
Disabled by default.