Siemens S223 Igmp v2 Fast Leave, Displaying the Igmp Configuration, A50010-Y3-C150-2-7619 287

User Manual	UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5

9.2.2.4IGMP 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-intervalcommand 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-leavecommand 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-		Configures the IGMP fast leave function.
		1-99: access list number
list {<1-99> <1300-1999>
	Interface	1300-1999: access list number (expanded range)
WORD}
		WORD: IP named standard access list
no ip igmp immediate-leave		Disables the fast leave configuration.

9.2.2.5Displaying 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]				Displays	the multicast groups with receivers directly
show ip igmp	groups INTER-
			Enable	connected to the router and learned through IGMP.
FACE [detail]
			Global
show ip igmp	groups INTER-
			Bridge
FACE A.B.C.D [detail]
show ip igmp interface				Displays	multicast-related information about an inter-
show ip igmp interface INTER-
				face.
FACE

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