Re: IGMP Snooping proxy

Hi Bharat,
4541 talks about a switch receiving/sending reports with src-ip 0.0.0.0. My question was w.r.t the upstream igmp router that receives this report. Hence, I was referring 2236. However, I got a reference in 3376 (IgmpV3 - section 4.2.13) that mandates to accept reports w/ source-ip 0.0.0.0

However, my igmp router is v2.

Thanks,
Magesh.

-----Original Message-----
From: Bharat Joshi [mailto:[email protected]] 
Sent: Monday, April 13, 2009 11:09 AM
To: V, Magesh (Magesh)
Cc: [email protected]
Subject: RE: IGMP Snooping proxy

Hi Magesh,

      Please see my response in line.

Thanks,
Bharat

> 
> *        Can you please elaborate as to what the igmp router can be configured with; is it to explicitly specify to process reports with src-ip 0.0.0.0?
> 
> *        I referred in 2236 (mine is a v2 router) where, I couldn't find a reference for this?

Please look at point 2 of section 2.1.1 of RFC 4541. It mention this. Just read through this RFC, consideration of source address as 0.0.0.0 is mentioned at couple of places.

> *        Lastly, regarding valid source-ip; I agree that a part of aggregation will be defeated but the switch may send just ONE report per mc group per vlan in addition to the aggregated report. The switch can use the source-ip of the report which it last heard to refresh its group membership expiry timer for than LAN.

Yes. Switch can surely do that and with this you do not need to send multiple join/leave requests upstream.

> *        OR it must be made possible in the proxy-snooping implementation to configure an ip-address per mrouter port which, can be used as the source-ip for the aggregates.

You can do this as well. It is similar to the above one but more granular.
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