Re: [magma] Querier transition based on Group Specific Query?

Bharat Joshi <> Tue, 31 January 2012 11:05 UTC

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From: Bharat Joshi <>
To: Indranil Bhattacharya <>, "" <>
Date: Tue, 31 Jan 2012 16:33:22 +0530
Thread-Topic: [magma] Querier transition based on Group Specific Query?
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Subject: Re: [magma] Querier transition based on Group Specific Query?
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Hi Indranil,

         I think a router should always be looking at general queries.

         This is what is available in RFC 2236:


   The following three events can cause the router to change states:

   - "query timer expired" occurs when the timer set for query
     transmission expires.

   - "query received from a router with a lower IP address" occurs when
     an IGMP Membership Query is received from a router on the same
     network with a lower IP address.

   - "other querier present timer expired" occurs when the timer set to
     note the presence of another querier with a lower IP address on the
     network expires.


     The second point clearly says that it should be an "IGMP Membership Query" which can trigger a change in querier state.

From: [] On Behalf Of Indranil Bhattacharya []
Sent: Tuesday, January 31, 2012 8:56 AM
Subject: [magma] Querier transition based on Group Specific Query?


   In the querier transition state machine, RFC 2236 only mentions 'Query' and does not specify GQ or GSQ. Can a querier transition take place based on GSQ? Or is it okay to for a querier to ignore GSQ? Can anyone please help me with this?


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