Mirja,
Actually sending more copies of the same packet, especially multicast packets,
rarely cause congestion.
Congestion only occurs when links’ utilization reach close to 100% as most
switches/routers today can handle wire speed forwarding. The rule of thumb of
deploying network is 50% link utilization, especially in data center where
links can be added very easily.
In addition, Application based multicast is less than 2% of total traffic.
Anyway, to make Collin happy, I already inserted one sentence in the following
original paragraph (in purple) in -10 version which has been uploaded:
“This method requires multiple copies of the same packet to all NVEs that
participate in the VN. If, for example, a tenant subnet is spread across 50
NVEs, the packet would have to be replicated 50 times at the source NVE.
Obviously, this approach creates more traffic to the network that can cause
congestion when the network load is high. This also creates an issue with the
forwarding performance of the NVE.”
ECN for NVO3 network is totally different subject. It will take a lot to
describe ECN clearly for NVO3 network. To the least, it is not even clear of
the scenario, use cases, and implication for ECN for NVO3.
Therefore, we don’t believe it is within the scope of this draft to discuss or
reference ECN for this draft.
Linda Dunbar
-----Original Message-----
From: Mirja Kühlewind [mailto:[email protected]]
Sent: Monday, October 09, 2017 10:57 AM
To: The IESG <[email protected]>
Cc: [email protected]; Sam Aldrin
<[email protected]>; Matthew Bocci <[email protected]>;
[email protected]; [email protected]; [email protected]
Subject: Mirja Kühlewind's Discuss on draft-ietf-nvo3-mcast-framework-10: (with
DISCUSS)
Mirja Kühlewind has entered the following ballot position for
draft-ietf-nvo3-mcast-framework-10: Discuss
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------
Based on the feedback provided by the tsv-art review (Thanks Colin!) I would
like to see a paragraph or short section that discusses how replication as used
in section 3.2 and 3.3 can impact multicast congestion control and also
provides a pointer to draft-ietf-tsvwg-ecn-encap-guidelines-09 in case ECN is
supported in the NVO network which can likely be the case in data center
scenarios.
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