Configuring mld snooping fast-leave processing – H3C Technologies H3C WX3000E Series Wireless Switches User Manual
Page 58
49
NOTE:
Unlike a static member port, a port that you configure as a simulated member host ages out like a dynamic
member port.
Configuring MLD snooping fast-leave processing
MLD snooping fast-leave processing allows the access controller to process MLD done messages quickly.
When MLD snooping fast-leave processing is enabled and the access controller receives an MLD done
message on a port, the access controller immediately removes that port from the outgoing port list of the
forwarding table entry for the indicated IPv6 multicast group. Then, when the access controller receives
MLD done 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, MLD snooping fast-leave processing helps
improve bandwidth and resource usage. However, if MLD snooping 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
access controller or in the VLANs, MLD snooping fast-leave processing function should not be enabled.
Configuring MLD snooping fast-leave processing globally
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter MLD-snooping view.
mld-snooping
N/A
3.
Enable MLD snooping
fast-leave processing.
fast-leave [ vlan vlan-list ]
Disabled by default.
Configuring MLD snooping fast-leave processing on a port or a group of ports
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view, Layer 2
aggregate interface view, or
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
Use either approach.
3.
Enable MLD snooping
fast-leave processing.
mld-snooping fast-leave [ vlan
vlan-list ]
Disabled by default.
Disabling a port from becoming a dynamic router port
The following problems might exist in a multicast access network: