3Com 4210 PWR Configuration Manual page 204

202 C 16: IGMP S
HAPTER
Configuring Fast Leave
Processing
n
C
NOOPING ONFIGURATION
Table 148 Configure timers
Operation
Configure the aging
timer of the multicast
member port
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
Table 149
Operation
Enter system view
Enable fast leave
processing
Enabling fast leave processing in Ethernet port view
Enable fast leave processing in Ethernet view
Table 150
Operation
Enter system view
Enter Ethernet port view
Enable fast leave processing for
specific VLANs
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.
Command
igmp-snooping
host-aging-time seconds
Command
system-view
igmp-snooping fast-leave [
vlan vlan-list ]
Command
system-view
interface interface-type
interface-number
igmp-snooping
fast-leave [ vlan vlan-list ]
Remarks
Optional
By default, the aging time of multicast
member ports is 260 seconds
Remarks
-
Required
By default, the fast leave processing
feature is disabled
Remarks
-
-
Required
By default, the fast leave
processing feature is disabled.