HP 6125G - Enabling IGMP Snooping Fast-Leave Processing; Disabling a Port from Becoming a Dynamic Router Port

22
Ste
p
Command
Remarks
3. Configure a port as a
simulated member host.
igmp-snooping host-join
group-address [ source-ip
source-address ] vlan vlan-id
Not configured by default.
Enabling IGMP snooping fast-leave processing
IGMP snooping fast-leave processing enables the switch to process IGMP leave messages quickly. With
IGMP snooping fast-leave processing enabled, when the switch receives an IGMP leave message on a
port, it immediately removes that port from the forwarding entry for the multicast group specified in the
message. Then, when the switch receives IGMP group-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 IGMP snooping fast-leave processing to save
bandwidth and resources. However, on a port that has multiple hosts attached, you should not enable
IGMP snooping fast-leave processing if you have enabled dropping unknown multicast data globally or
for the port. Otherwise, if a host on the port leaves a multicast group, the other hosts attached to the port
in the same multicast group cannot receive the multicast data for the group.
Enabling IGMP snooping fast-leave processing globally
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP-snooping view.
igmp-snooping N/A
3. Enable IGMP snooping
fast-leave processing.
fast-leave [ vlan vlan-list ] Disabled by default
Enabling IGMP snooping fast-leave processing on a port
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
Use either command.
3. Enable IGMP snooping
fast-leave processing.
igmp-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:
• After receiving an IGMP general query or a PIM hello message from a connected host, a router port
becomes a dynamic router port. Before its timer expires, this dynamic router port receives all
multicast packets within the VLAN where the port belongs, and forwards them to the host, affecting
normal multicast reception of the host.