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A simulated host acts like a real host, as follows:
•
When a port is configured as a simulated member host, the switch sends an unsolicited MLD
report through that port.
•
After a port is configured as a simulated member host, the switch responds to MLD general
queries by sending MLD reports through that port.
•
When the simulated joining function is disabled on a port, the switch sends an MLD done
message through that port.
Follow these steps to configure simulated joining:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter Ethernet interface/Layer 2
aggregate interface view or port
group view
interface
interface-type
interface-number
Required
Use either approach
port-group
manual
port-group-name
Configure simulated joining
mld-snooping host-join
ipv6-group-address
[
source-ip
ipv6-source-address
]
vlan
vlan-id
Required
Disabled by default
NOTE:
•
Each simulated host is equivalent to an independent host. For example, when receiving an MLD
query, the simulated host corresponding to each configuration responds respectively.
•
Unlike a static member port, a port configured as a simulated member host will age out like a
dynamic member port.
Configuring fast leave processing
The fast leave processing feature enables the switch to process MLD done messages quickly. When
the fast leave processing feature is enabled and the switch receives an MLD done message on a
port, the switch immediately removes that port from the outgoing port list of the forwarding table entry
for the indicated IPv6 multicast group. Then, when receiving MLD done multicast-address-specific
queries for that IPv6 multicast group, the switch will not forward them to that port.
In VLANs where only one host is attached to each port, fast leave processing helps improve
bandwidth and resource usage. However, if fast leave processing is enabled on a port to which more
than one host is attached, 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 switch
or in the VLANs, you should not enable the fast leave processing function.
Configuring fast leave processing globally
Follow these steps to configure fast leave processing globally:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter MLD snooping view
mld-snooping
—
Enable fast leave processing
fast-leave
[
vlan
vlan-list
]
Required
Disabled by default