Explanation Of Igmp Proxy - Allied Telesis AR400 Series How To Configure

Explanation of
When there are no group members
The multicast server streams group 224.12.13.14 to switch 1 through port 1. IGMP snooping
detects the stream, as you can see by using the command show igmpsnooping on switch 1.
Manager Switch 1> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Group List ..............
Vlan Name (vlan id) ..... vlan200 (200)
Group List ..............
------------------------------------------------------------------------
When a client joins a group
Client 1 (attached to switch 2, the Snooper) sends an IGMP Membership Report for the
group 224.12.13.14. Switch 2 forwards that report message in an unmodified state out its All
Groups ports—in this case port 25.
Manager Switch 2> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Fast Leave .............. Off
Group List ..............
Vlan Name (vlan id) ..... vlan100 (100)
Fast Leave .............. Off
Group List ..............
------------------------------------------------------------------------
Switch 3—the Proxy—receives the report on its downstream interface, vlan100. Switch 3
then creates a new report with itself as the sender. It sends this report upstream to switch 1
Page 23 | AlliedWare™ OS How To Note: IGMP
IGMP proxy
No group memberships.
Group. 224.12.13.14
Ports None
No group memberships.
Group. 224.12.13.14
Ports 2
All Groups
Ports 25
IGMP proxy > Explanation of IGMP proxy
Entry timeout 122 secs
Entry timeout 256 secs
Entry timeout 145 secs