22
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 (*, G) or (S,
G) joining
igmp-snooping host-join
group-address
[
source-ip
source-address
]
vlan
vlan-id
Required
Disabled by default
NOTE:
•
Each simulated host is equivalent to an independent host. For example, when receiving an
IGMP 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 allows the switch to process IGMP leave messages in a fast way.
With the fast leave processing feature enabled, when receiving an IGMP leave message on a port,
the switch immediately removes that port from the outgoing port list of the entry in the forwarding
table for the indicated group. Then, when receiving IGMP group-specific queries for that 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. If the
function of dropping unknown multicast traffic is already enabled on the switch or in the VLANs, the
fast leave processing function should not be enabled.
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 IGMP snooping view
igmp-snooping
—
Enable fast leave processing
fast-leave
[
vlan
vlan-list
]
Required
Disabled by default
Configuring fast leave processing on a port or a group of ports
Follow these steps to configure fast leave processing on a port or a group of ports:
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
Enable fast leave processing
igmp-snooping
fast-leave
[
vlan
vlan-list
]
Required
Disabled by default