Allied Telesis AR400 manual This output now shows two entries, one for each of the following

IGMP snooping > Explanation of IGMP snooping

This output now shows two entries, one for each of the following:

zgroup 224.12.13.14 and port 3, which shows that the client is attached to the Snooper through port 3 and is listening to group 224.12.13.14. The Snooper created this entry at stage 5 in the process ("IGMP learning process" on page 11). This entry means that the Snooper forwards packets from 224.12.13.14 out port 3.

zAll Groups and port 26, which shows that the Snooper is connected to the Querier through port 26. The Snooper created this entry at stage 2 in the process. This entry means that the Snooper forwards all IGMP Reports and Leave messages out port 26.

The All Groups entry means that the Snooper forwards the Report from the client out port 26 to the Querier, switch 1. The Querier receives the Report on port 49.

Next, look at the output of the command show ip igmp on the Querier.

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. 172.31.0.223		Refresh time 256 secs
Ports 49

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

The output above shows an entry for group 224.12.13.14 and port 49. This entry shows that the Querier knows about a client for 224.12.13.14 which it reaches by forwarding the multicast out port 49. The Querier created this entry at stage 6 in the process.

Page 13 AlliedWare™ OS How To Note: IGMP