Re: [magma] Version of General Query sent by a V3 Querier in thepresence of lower version hosts

Thanks for the reply Ashish, but the section talks about the group compatibility mode, but does not say anything regarding what should be the version of the general queries sent. The compatibility mode is kept per group, but what should be the compatibility mode of the general queries which is not related to any particular group, this is not mentioned clearly.

Regards,

Suvendu.

From: Ashish Yadav [mailto:Ashish.Yadav at conexant.com]
Sent: Monday, March 24, 2008 3:00 PM
To: Suvendu Mozumdar; magma at ietf.org
Cc: Rhitwick Mookherjee
Subject: RE: [magma] Version of General Query sent by a V3 Querier in thepresence of lower version hosts

Hi,

The querier should send version 1 queries, as mentioned in the section 7.3.2 of RFC 3376.

“IGMPv3 routers may be placed on a network where there are hosts that

   have not yet been upgraded to IGMPv3.  In order to be compatible with

   older version hosts, IGMPv3 routers MUST operate in version 1 and

   version 2 compatibility modes.

   IGMPv3 routers keep a compatibility mode per group record.

   A group's compatibility mode is determined

   from the Group Compatibility Mode variable which can be in one of

   three states:  IGMPv1, IGMPv2 or IGMPv3.  This variable is kept per

   group record and is dependent on the version of Membership Reports

   heard for that group as well as the Older Version Host Present timer

   for the group.

”

Regards,

Ashish

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From: magma-bounces at ietf.org [mailto:magma-bounces at ietf.org] On Behalf Of Suvendu Mozumdar
Sent: Monday, March 24, 2008 2:25 PM
To: magma at ietf.org
Cc: Rhitwick Mookherjee
Subject: [magma] Version of General Query sent by a V3 Querier in thepresence of lower version hosts

I have this following doubt for which RFC 3376 has no clear directive. In a LAN there is a v3 querier and three hosts each of version 1, 2 and 3 respectively. What should be the version of the general queries sent by the querier, will it send v1 queries, v2 queries or v3 queries?? Logically thinking it should send queries with the lowest version present in the LAN. Please advise.

Regards,

Suvendu.

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