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Page 32 | AlliedWare™ OS How To Note: IGMP
Query solicitation (rapid recovery from topology changes) > Why convergence takes so long without query solicitation
When link
comes up
again
When we reconnect port 1 on the Snooper, the port does not reappear because the
Querier has not yet received a Report over it. Therefore, the Querier does not start
forwarding the multicast stream out the port.
Eventually, the Querier sends an IGMP Query out all its ports. In response it receives a
Report from the client (via the Snooper). This restores the port entry and the Querier starts
sending the multicast stream again.
The output of the commands show igmpsnooping and show ip igmp both show this
restored entry.
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 115 secs
Ports 1
------------------------------------------------------------------------
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 ..................... vlan1 (DR)
IGMP Status ........................ Enabled
IGMP Proxy ......................... Off
General Query Reception Timeout .... None
Group List .........................
Group. 224.12.13.14 Last Adv. 10.13.2.11 Refresh time 110 secs
Ports 1
------------------------------------------------------------------------