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To avoid this situation, you can configure a port on the switch as a simulated member host for an
IPv6 multicast group. When the simulated member host receives an MLD query, it gives a response.
Therefore, the switch can continue receiving IPv6 multicast data.
A simulated host is equivalent to a real, independent host in the following ways:
•
When a port is configured as a simulated member host, the switch can send an unsolicited MLD
report through the port. It can also respond to MLD general queries with MLD reports through
the port.
•
When the simulated joining configuration is canceled on the port, the switch sends an MLD
done message through that port.
To configure a port as a simulated member host:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view or
enter 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.
Configure the port as a
simulated member host.
mld-snooping host-join
ipv6-group-address
[
source-ip
ipv6-source-address
]
vlan
vlan-id
A port is not a simulated member
host by default.
NOTE:
Unlike a static member port, a port that you configure as a simulated member host ages out like a
dynamic member port.
Enabling MLD snooping fast-leave processing
MLD snooping fast-leave processing feature enables the switch to process MLD done messages
quickly. After MLD snooping fast-leave processing feature is enabled, when the switch 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 switch 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 MLD snooping fast-leave processing to
save bandwidth and resources. However, on a port that has multiple hosts attached, you should not
enable MLD snooping 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 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.
