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Allied Telesis AR400 User Manual

Page 32

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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

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

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