Allied Telesis AR400 IGMP fast leave, Example, set igmpsnooping fastleave=onoff interface=vlanx

IGMP fast leave > Example

IGMP fast leave

IGMP Fast Leave enhances your control over router or switch bandwidth. Enabling Fast Leave tells IGMP snooping to stop the transmission of a group multicast stream to a port as soon as it receives a Leave message on that port. No timeouts are observed.

Ordinarily, when IGMP snooping sees a Leave message, it waits for a Membership Query message before setting the entry timeout to 2 seconds. Fast Leave tells IGMP to drop the entry from the port as soon as the Leave message is seen. For this reason, Fast Leave should only be configured on interfaces that have one clien t per port.

Availability IGMP Fast Leave is available in Software Version 2.7.5 or later. In Software Versions earlier than 281-03 and 2.9.1, configure it by using the command:

set igmpsnooping fastleave={onoff} interface=vlanx

In Software Versions 281-03 and 2.9.1, the syntax changed to make it consistent with Query Solicitation. Therefore, the above syntax is still valid but the recommended syntax is now:

set igmpsnooping vlan=vlanx fastleave={onoff}

Software Version 291-08introduced multiple mode for Fast Leave. See "Multiple host mode for fast leave" on page 67.

Example

This example uses the same network configuration as "IGMP snooping" on page 9. For convenience, the diagram is reproduced below.

	Multicast Server
	port 1	AT-8948
			Switch 1:
			Querier
	port 50	port 49
	(blocked by STP)
	port 26		port 26
Switch 2:	Rapier 24i		Rapier 24i	Switch 3:
Snooper	port 25		port 25	Snooper
	port 2		port 3
	Client 1		Client 2
				igmp-snooper.eps

Page 61 AlliedWare™ OS How To Note: IGMP