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Page 31 | AlliedWare™ OS How To Note: IGMP
Query solicitation (rapid recovery from topology changes) > Why convergence takes so long without query solicitation
Explanation from the perspective of switch 1, the querier
When link
is up
When the link is connected (all ports are up), the Querier has an entry for port 1, so it sends
the group 224.12.13.14 out port 1. The output of the command show igmpsnooping
shows this entry.
When link
goes down
When we disconnect port 1 on the Snooper, the port disappears. The Querier is still
receiving the multicast stream from the server, so the group entry remains.
Manager Switch 1> show igmpsnooping
Manager A> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Fast Leave .............. Off
Query Solicitation ...... Off
Static Router Ports ..... None
Group List ..............
Group. 224.12.13.14 Entry timeout 18 secs
Ports 1
------------------------------------------------------------------------
Manager Switch 1> show igmpsnooping
IGMP Snooping
------------------------------------------------------------------------
Status ........................... Enabled
Disabled All-groups ports ........ None
Vlan Name (vlan id) ..... default (1)
Fast Leave .............. Off
Query Solicitation ...... Off
Static Router Ports ..... None
Group List ..............
Group. 224.12.13.14 Entry timeout 255 secs
Ports None
------------------------------------------------------------------------