Hi Larry, Agreed, this sentence should have been a MAY.
Additionally, I'll clarify that either ingress replication or the use of multicast can be used for BUM traffic. Marc ________________________________ From: Larry Kreeger (kreeger) [mailto:[email protected]] Sent: Monday, May 21, 2012 10:46 PM To: LASSERRE, MARC (MARC); [email protected] Subject: Re: [nvo3] New dataplane requirements draft Hi Marc and Nabil, In section 3.2.1, your draft states: "It MUST also be possible to select whether the NVE provides optimized multicast trees inside the VNI for individual tenant multicast groups or whether the default VNI flooding tree is used." Am I correctly interpreting this statement to mean that overlay solution MUST support using multiple multicast trees for each VNI in order to support IGMP Snooping? If so, I don't see this as a MUST requirement for two reasons. First, many data centers do not support IP multicast services for the applications running within them, and therefore burdening all implementations with a feature that may not be needed seems unnecessary. Second, the amount of multicast routes available in the data center may already be strained to have enough routes for traffic sourced by the NVEs towards the (*, G) just to support the BUM traffic within a VNI. When many VNIs exist within the data center, there may not be enough multicast state for each VNI to have its own single (*, G), let alone multiple for each VNI for this IGMP Snooping function. I think this can be downgraded from a MUST to a MAY. - Larry From: <LASSERRE>, "MARC (MARC)" <[email protected]<mailto:[email protected]>> Date: Thursday, May 17, 2012 1:31 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [nvo3] New dataplane requirements draft We have just posted a new draft on nvo3 data plane requirements: http://www.ietf.org/id/draft-bitar-lasserre-nvo3-dp-reqs-00.txt We welcome your feedback. Our intent is to submit a revised version by Vancouver addressing your comments and/or suggestions. Thanks, Marc
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