202 CHAPTER 16: IGMP SNOOPING CONFIGURATION
Configuring Fast Leave
Processing
With fast leave processing enabled, when the switch receives an IGMP leave
message on a port, the switch directly removes that port from the forwarding
table entry for the specific group. If only one host is attached to a port, enable fast
leave processing to improve bandwidth management.
Enabling fast leave processing in system view
Table 2-6 Enable fast leave processing in system view
Enabling fast leave processing in Ethernet port view
n
■ The fast leave processing function works for a port only if the host attached to
the port runs IGMPv2 or IGMPv3.
■ The configuration performed in system view takes effect on all ports of the
switch if no VLAN is specified; if one or more VLANs are specified, the
configuration takes effect on all ports in the specified VLAN(s).
■ The configuration performed in Ethernet port view takes effect on the port no
matter which VLAN it belongs to if no VLAN is specified; if one or more VLANs
are specified, the configuration takes effect on the port only if the port belongs
to the specified VLAN(s).
■ If fast leave processing and unknown multicast packet dropping are enabled
on a port to which more than one host is connected, when one host leaves a
multicast group, the other hosts connected to port and interested in the same
multicast group will fail to receive multicast data for that group.
Configure the aging
timer of the multicast
member port
igmp-snooping
host-aging-time seconds
Optional
By default, the aging time of multicast
member ports is 260 seconds
Table 148 Configure timers
Operation Command Remarks
Table 149
Operation Command Remarks
Enter system view system-view -
Enable fast leave
processing
igmp-snooping fast-leave [
vlan vlan-list ]
Required
By default, the fast leave processing
feature is disabled
Tabl e 150 Enable fast leave processing in Ethernet view
Operation Command Remarks
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Enable fast leave processing for
specific VLANs
igmp-snooping
fast-leave [ vlan vlan-list ]
Required
By default, the fast leave
processing feature is disabled.
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