Re: [magma] Non-Querier behaviour on receiving grp specific or grp-and-src specific queries

Ravikumar V J

Message: 1
Date: Fri, 23 May 2008 01:25:57 -0700
From: "Suvendu Mozumdar"
Subject: [magma] Non-Querier behaviour on receiving grp specific or
grp-and-src specific queries
To:
Message-ID:
<4C3C777A1128A74BA27FECF4E421BCBE0261077F at IXCA-EXCHANGE.ixiacom.com>
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Hi,

I have an issue for which the RFC 3376 does not suggest anything.
Lets say in a Lan there are two igmpv3 routers and one igmpv3 host
present. Lets say Q1 is querier and Q2 is non-querier. Now Host1 sends
include s1 for grp G1. Both Q1 and Q2 will have an entry in their
respective database. Now Host1 sends a report block s1 for grp G1. Q1 on
receipt of this block report will start LMQT timer, set the source timer
of s1 to LMQT and start sending group and source specific queries for
G1/s1. After LMQT expires Q1 will delete the entry of G1/s1 from its
database. Now what will be the non-querier's behaviour. Will it also
start LMQT, in that case Querier's LMQT and non-querier's LMQT (which is
LMQC*LMQI) may differ based on different LMQC values. Non-querier comes
to know about the querier's LMQI from the Max Response Code in the
specific query pkt but what about querier's LMQC, non-querier has no way
to know about the querier's LMQI.

Can anyone throw some light on this?

Thanks

Suvendu.

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Message: 2
Date: Fri, 23 May 2008 14:07:00 +0530
From: Bharat Joshi
Subject: Re: [magma] Non-Querier behaviour on receiving grp specific
or grp-and-src specific queries
To: Suvendu Mozumdar
Cc: "magma at ietf.org"
Message-ID: <1211531820.22712.19.camel at magadha>
Content-Type: text/plain; charset=

Suvendu,

>
> I have an issue for which the RFC 3376 does not suggest anything.
> Lets say in a Lan there are two igmpv3 routers and one igmpv3 host
> present. Lets say Q1 is querier and Q2 is non-querier. Now Host1 sends
> include s1 for grp G1. Both Q1 and Q2 will have an entry in their
> respective database. Now Host1 sends a report block s1 for grp G1. Q1
> on receipt of this block report will start LMQT timer, set the source
> timer of s1 to LMQT and start sending group and source specific
> queries for G1/s1. After LMQT expires Q1 will delete the entry of
> G1/s1 from its database. Now what will be the non-querier's behaviour.
> Will it also start LMQT,

Please look at section 6.6.1. When a non-querier receives a query, it
reduces its corresponding timer to LMQT which can be derived from
max-response code.

> in that case Querier's LMQT and non-querier's LMQT (which is
> LMQC*LMQI) may differ based on different LMQC values. Non-querier
> comes to know about the querier's LMQI from the Max Response Code in
> the specific query pkt but what about querier's LMQC, non-querier has
> no way to know about the querier's LMQI.

Non-querier does not need to know LMQC as it is not required. LMQC is
required for a querier to generate number of queries.

Also most of the times, it is expected that all routers are configured
with same values but things should still work if they are not.

Hope this helps.

Thanks,
Bharat

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