Allied Telesis AR400 manual Using Show command output to investigate IGMP state

IGMP snooping > Explanation of IGMP snooping

Using Show command output to investigate IGMP state

No group In the first stage of the figure above, the multicast server is turned on and is streaming group members 224.12.13.14 to the Querier, switch 1. Switch 1 knows about the group, but has nobody

interested in receiving it. You can see this by using the command show igmpsnooping on switch 1. The output of this command shows that switch 1 has an entry for the group, but no associated ports.

Manager Switch 1> 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 136 secs
Ports None

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

Client joins When a client joins the group, the Group List changes for the Snooper that the client is the group attached to, and for the Querier. First, look at the output of the command show

igmpsnooping on the Snooper.

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	257	secs
Ports		3
All	Groups		Entry timeout	235	secs
Ports		26

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

Page 12 AlliedWare™ OS How To Note: IGMP