Allied Telesis AR400 manual When fast leave is disabled, Page 64 AlliedWare OS How To Note IGMP

IGMP fast leave > Explanation of IGMP fast leave

When fast leave is disabled

The IGMP Snooper sees the Membership Query from the Querier and accordingly sets its expiry time to match the Querier. Output of the command show igmpsnooping on switch 3 shows that the timeout for the group 224.12.13.14 has dropped to 2 seconds and that port 3 is still attached to the group. Likewise, output of the command show ip igmp on switch 1 shows a timeout of 2 seconds.

Manager Switch 3> show igmpsnooping

IGMP Snooping

------------------------------------------------------------------------

Status		...........................	Enabled
Disabled All-groups ports			........ None
Vlan	Name (vlan id) ..... default (1)
Fast	Leave		Off
Group List
No	group memberships.
Vlan	Name (vlan id) ..... vlan100 (100)
Fast	Leave		Off
Group List
Group. 224.12.13.14			Entry timeout 2 secs
Ports		3
All Groups			Entry timeout 258 secs
Ports		26

------------------------------------------------------------------------

Manager Switch 1> show ip igmp

IGMP Protocol

------------------------------------------------------------------------

Status	Enabled
Default Query Interval	125	secs
Default Timeout Interval	260	secs
Last Member Query Interval	10 (1/10secs)
Last Member Query Count	2
Robustness Variable	2
Query Response Interval	100	(1/10secs)
Disabled All-groups ports	None

Interface Name	vlan100	(DR)
Group List
Group. 224.12.13.14	Last Adv. 172.31.0.222		Refresh time 2 secs
Ports 49

------------------------------------------------------------------------

If no Membership Report is received by the time the counters go to zero, then the client’s entry is dropped from both the IGMP Querier and Snooper.

Page 64 AlliedWare™ OS How To Note: IGMP