Siemens S223 - Manual (Page 287)

User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 287
9.2.2.4 IGMP v2 Fast Leave
In IGMP version 2, you can minimize the leave latency of IGMP memberships. This com-
mand is used when only one receiver host is connected to each interface.
When this command is not configured, the router sends an IGMP group-specific query
message upon receipt of an IGMP Version 2 group leave message. The router stops for-
warding traffic for that group only if no host replies to the query within the timeout period.
The timeout period is determined by the ip igmp last-memberquery-interval command
and the IGMP robustness variable, which is defined by the IGMP specification. By default,
the timeout period is 2 seconds.
When the ip igmp immediate-leave command is enabled on an interface, the router
does not send IGMP group specific host queries on receiving an IGMP Version 2 leave
group message from that interface. Instead, the router immediately removes the interface
from the IGMP cache for that group, and informs the multicast routing protocols.
To configure the IGMP v2 fast leave, use the following command.
Command Mode Description
ip igmp immediate-leave group-
list {<1-99> | <1300-1999> |
WORD }
Configures the IGMP fast leave function.
1-99: access list number
1300-1999: access list number (expanded range)
WORD: IP named standard access list
no ip igmp immediate-leave
Interface
Disables the fast leave configuration.
9.2.2.5 Displaying the IGMP Configuration
To display the multicast groups and related information, use the following command.
Command Mode Description
show ip igmp groups [detail]
show ip igmp groups A.B.C.D
[detail]
show ip igmp groups INTER-
FACE [detail]
show ip igmp groups INTER-
FACE A.B.C.D [detail]
Displays the multicast groups with receivers directly
connected to the router and learned through IGMP.
show ip igmp interface
show ip igmp interface INTER-
FACE
Enable
Global
Bridge
Displays multicast-related information about an inter-
face.