Re: [magma] Question about IGMP host implementation

Indranil Bhattacharya <myselfindranil@gmail.com> Wed, 12 October 2011 14:24 UTC

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Date: Wed, 12 Oct 2011 19:54:26 +0530
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From: Indranil Bhattacharya <myselfindranil@gmail.com>
To: "Beeram, Suresh KumarReddy" <sbeeram@hp.com>
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Cc: "magma@ietf.org" <magma@ietf.org>
Subject: Re: [magma] Question about IGMP host implementation
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Hi Suresh,
                           VLANA(10.x.x.x)         VLANB(20.x.x.x)

RTR-------------------------------sw------------------------------HOST.

All the queries received on VLANA will be forwared to VLANB. When mcast data
is received on vlanA those will also be forwarded on vlanB after some header
rewrite. Please let me know if this answers your question.
Thanks,
Indranil
On Wed, Oct 12, 2011 at 4:16 PM, Beeram, Suresh KumarReddy
<sbeeram@hp.com>wrote;wrote:

>  Hi Indranil,****
>
> Why the Query coming from VLAN-A has to be forwarded to VLAN-B?****
>
> In general switch should forward the Query packets to all the ports in same
> VLAN(VLAN-A). Hosts receiving the Query can reply to the query even the
> source address of the Query is in different subnet.****
>
> Is there anything I am missing in your reply???****
>
> Thanks****
>
> B S  Reddy****
>
> ** **
>
> *From:* magma-bounces@ietf.org [mailto:magma-bounces@ietf.org] *On Behalf
> Of *Indranil Bhattacharya
> *Sent:* Wednesday, October 12, 2011 2:06 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>
> 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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> ** **
>