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

[Bharat Joshi <bharat_joshi at infosys.com>]

Hi 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.
> Suvendu : As per section 8.10, LMQT = LMQC*LMQI, I agree that LMQI is
> the max-response code in the specific query, but LMQC is configurable
> and MAY differ in querier and non-querier. That's where my doubt arises.

Non-querier need not use LMQT in turn LMQC at all. They can simply lower down their group/source timer to LMQI calculated based on Max-Response-Code and they do it for each group/group-source specific query.

> > 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.
> Suvendu : Not only that, LMQC is used in calculating LMQT, pl refer
> section 8.10.

Please see above.

Thanks,
Bharat

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