Re: [magma] Question about IGMP host implementation

Indranil Bhattacharya <myselfindranil@gmail.com> Wed, 12 October 2011 14:25 UTC

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Date: Wed, 12 Oct 2011 19:55:14 +0530
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From: Indranil Bhattacharya <myselfindranil@gmail.com>
To: Bharat Joshi <bharat_joshi@infosys.com>
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Subject: Re: [magma] Question about IGMP host implementation
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Hi Bharat,

              I was thinking on the line of cat3k switches where we can
configure SVIs.

Thanks,
Indranil

On Wed, Oct 12, 2011 at 4:53 PM, Bharat Joshi <bharat_joshi@infosys.com>wrote:

> How is a switch has two different subnets on its two ports? Typically
> switch divides the broadcast domain. Right?
>
> Regards,
> Bharat
> ________________________________________
> From: magma-bounces@ietf.org [magma-bounces@ietf.org] On Behalf Of
> Indranil Bhattacharya [myselfindranil@gmail.com]
> Sent: Wednesday, October 12, 2011 2:05 PM
> To: Kunal Shah
> Cc: magma@ietf.org
> Subject: Re: [magma] Question about IGMP host implementation
>
> Hi Kunal,
>
>             Yes it should. The scenario that I have in mind is a switch
> whose mrouter interface is in vlanA and igmp joins are received on an
> interface in vlanB. In this case, query coming from vlanA(different subnet)
> has to be answered by hosts in vlanB.
>
> Thanks,
> Indranil
>
> On Wed, Oct 12, 2011 at 6:08 AM, Kunal Shah <kunal.shah@ericsson.com
> <mailto:kunal.shah@ericsson.com>> wrote:
> Hi all,
>
> Can an IGMPv2 host respond to a general query originated from a subnet
> other then its own?? RFC 2236 states:
>
> ""query received" occurs when the host receives either a valid
>     General Membership Query message, or a valid Group-Specific
>     Membership Query message.  To be valid, the Query message must be
>     at least 8 octets long, and have a correct IGMP checksum.  The
>     group address in the IGMP header must either be zero (a General
>     Query) or a valid multicast group address (a Group-Specific Query)"
>
> There is no requirement for the source address to be on the same subnet as
> the host.
>
> Thanks,
> Kunal
>
>
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