SMC Networks TigerAccess SMC7816M - Manual (Page 409)

L
AYER
2 IGMP (S
NOOPING AND
Q
UERY
)
16-13
Configuring Immediate Leave from Multicast Groups
The switch can be configured to immediately delete a member port of a
multicast service if a leave packet is received at that port and the
immediate-leave function is enabled for the parent 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 IGMP Query Report
Delay (see “Configuring IGMP Snooping and Query Parameters” on
page 16-4).
• 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.
• Immediate leave is only effective if IGMP snooping is enabled, and
IGMPv2 or IGMPv3 snooping is used.
Command Attribute
• VLAN ID – VLAN Identifier. (Range: 1-4094)
• IGMP Immediate Leave Status – Sets the status for immediate leave
on the specified VLAN. (Default: Disabled)