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Configuring Layer 2 Multicast IGMP Snooping Configuration
User Guide 314
Step 2 ip igmp snooping vlan-config
vlan-id-list
mtime
member-time
Enable IGMP Snooping for the specified VLANs, and specify the member port aging time for
the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
member-time:
Specify the aging time of the member ports in the specified VLANs. Valid values
are from 60 to 600 seconds. By default, it is 260 seconds.
Once the switch receives an IGMP membership report message from a port, the switch adds
this port to the member port list of the corresponding multicast group. Member ports that are
learned in this way are called dynamic member ports.
If the switch does not receive any IGMP membership report message for a specific multicast
group from a dynamic member port, it will no longer consider this port as a member port of this
multicast group and delete it from the multicast forwarding table.
Step 3 ip igmp snooping vlan-config
vlan-id-list
rtime
router-time
Specify the router port aging time for the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
router-time:
Specify the aging time of the router ports in the specified VLANs. Valid values are
from 60 to 600 seconds. By default, it is 300 seconds.
Once the switch receives an IGMP general query message from a port, the switch adds this
port to the router port list. Router ports that are learned in this way are called dynamic router
ports.
If the switch does not receive any IGMP general query message from a dynamic router port
within the router port aging time, the switch will no longer consider this port as a router port
and delete it from the router port list.
Step 4 ip igmp snooping vlan-config
vlan-id-list
ltime
leave-time
Specify the router port aging time for the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
leave-time:
Specify the leave time for the VLAN(s). Valid values are from 1 to 30 in seconds,
and the default value is 1 second.
When the switch receives a leave message from a port to leave a multicast group, it will wait for
a leave time before removing the port from the multicast group. During the period, if the switch
receives any report messages from the port, the port will not be removed from the multicast
group. Exceptions are as follows:
•
If the member port ages out before the Leave Time ends and no report messages are
received, the port will be removed from the multicast group once its Member Port Aging
Time ends.
•
The Leave Time mechanism will not take effect when Fast Leave takes effect.
A proper leave time value can avoid other hosts connecting to the same port of the switch
being mistakenly removed from the multicast group when only some of them want to leave.
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