SMC Networks SMC TigerAccess SMC7824M/FSW - Manual (Page 684)

M
ULTICAST
F
ILTERING
C
OMMANDS
33-6
• IGMP version 1 hosts do not respond to multicast group-specific
queries. If a version 1 host is known by the switch to exist on a LAN
segment, it will not use the IGMP snooping leave-proxy mechanism
on that interface, but will instead process any group leave requests as
specified in the original mechanism for IGMP snooping.
Example
The following shows how to enable leave proxy.
ip igmp snooping immediate-leave
This command immediately deletes a member port of a multicast service if
a leave packet is received at that port and immediate-leave is enabled for
the parent VLAN. Use the no form to restore the default.
Syntax
ip igmp snooping immediate-leave
no ip igmp snooping immediate-leave
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
• If immediate-leave is not used, a multicast router (or querier) will send
a group-specific query message when an IGMPv2/v3 group leave
message is received. The router/querier stops forwarding traffic for
that group only if no host replies to the query within the specified
timeout period. Note that the timeout period is determined by the ip
igmp snooping query-max-response-time (see page 33-11).
• If immediate-leave is enabled, the switch assumes that only one host
is connected to the interface. Therefore, immediate leave should only
be enabled on an interface if it is connected to only one
IGMP-enabled device, either a service host or a neighbor running
IGMP snooping.
Console(config)#ip igmp snooping leave-proxy
Console(config)#