Configuring Layer 2 Multicast MLD Snooping Configuration
User Guide 239
Step 5 ipv6 mld snooping vlan-config
vlan-id-list
report-suppression
(Optional) Enable Report Suppression for the VLANs. By default, it is disabled.
When enabled, the switch will only forward the first MLD report message for each multicast
group to the MLD querier and suppress subsequent MLD report messages for the same
multicast group during one query interval. This feature prevents duplicate report messages
from being sent to the MLD querier.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
Step 6 ipv6 mld snooping vlan-config
vlan-id-list
immediate-leave
(Optional) Enable Fast Leave for the VLANs. By default, it is disabled.
Without Fast Leave, after a receiver sends an MLD done message (equivalent to an IGMP leave
message) to leave a multicast group, the switch will forward the done message to the Layer 3
device (the querier).
From the point of view of the querier, the port connecting to the switch is a member port of the
corresponding multicast group. After receiving the done message from the switch, the querier
will send out a configured number (Last Listener Query Count) of Multicast-Address-Specific
Queries (MASQs) on that port with a configured interval (Last Listener Query Interval), and wait
for MLD reports. If there are other receivers connecting to the switch, they will response to
the MASQs before the Last Listener Query Interval expires. If no reports are received after the
response time of the last query expires, the querier will remove the port from the forwarding
list of the corresponding multicast group.
That is, if there are other receivers connecting to the switch, the one sent done message have
to wait until the port ages out from the switch’s forwarding list of the corresponding multicast
group (the maximum waiting time is decided by the Member Port Aging Time).
With Fast Leave enabled on a VLAN, the switch will remove the (Multicast Group, Port, VLAN)
entry from the multicast forwarding table before forwarding the done message to the querier.
This helps to reduce bandwidth waste since the switch no longer sends the corresponding
multicast streams to the VLAN of the port as soon as the port receives a done message from
the VLAN.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
Step 7 ipv6 mld snooping vlan-config
vlan-id-list
rport interface { fastEthernet
port-list
|
gigabitEthernet
port-list
| ten-gigabitEthernet
port-list
| port-channel
lag-list
}
(Optional) Specify the static router ports for the VLANs. Static router ports do not age.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
port-list
: The number or the list of the Ethernet port that need to be configured as static router
ports.
lag-list
: The ID or the list of the LAG that need to be configured as static router ports.
Step 8 ipv6 mld snooping vlan-config
vlan-id-list
router-ports-forbidden interface { fastEthernet
port-list
| gigabitEthernet
port-list
| ten-gigabitEthernet
port-list
| port-channel
lag-list
}
(Optional) Specify the ports to forbid them from being router ports in the VLANs.
vlan-id-list:
Specify the ID or the ID list of the VLAN(s).
port-list
: The number or the list of the Ethernet port that need to be forbidden from being
router ports.
lag-list
: The ID or the list of the LAG that need to be forbidden from being router ports.
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