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[bess] few queries regarding rfc9014 : https://datatracker.ietf.org/doc/html/rfc9014

"Dikshit, Saumya" <saumya.dikshit@hpe.com> Tue, 13 February 2024 11:50 UTC

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From: "Dikshit, Saumya" <saumya.dikshit@hpe.com>
To: BESS <bess@ietf.org>, "Jorge Rabadan (Nokia)" <jorge.rabadan@nokia.com>
CC: "bess-chairs@ietf.org" <bess-chairs@ietf.org>
Thread-Topic: few queries regarding rfc9014 : https://datatracker.ietf.org/doc/html/rfc9014
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Date: Tue, 13 Feb 2024 11:49:50 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/teg_CpXqMNa_S9Bs5gnFI2Tg1NM>
Subject: [bess] few queries regarding rfc9014 : https://datatracker.ietf.org/doc/html/rfc9014
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Hello Authors of https://datatracker.ietf.org/doc/html/rfc9014

I have few queries specifically on the "UMR" and "arp/nd flooding control" and might be inter-related
>>>> https://datatracker.ietf.org/doc/html/rfc9014#section-3.5.1 MAC Address Advertisement Control<https://datatracker.ietf.org/doc/html/rfc9014#name-mac-address-advertisement-c>
Host1-----NVE1-----PE1-----(WAN)-----PE2-----NVE2----Host2
For realization of UMR usage, does the logic entails that

*       the end-host (host1) shall learn the remote-hosts (host2) MAC and IP (in a remote DC/fabric/site for same-subnet) over data-plane via normal flood and learn via typical APR request/response; and

o    the eventual data flow from host1 to the host2 shall hits the UMR on NVE1 (first hop Vtep)

*       the first-hop vtep (NVE1) will not learn the MAC bindings over Control plane from the PE1

o   as the PE1 will publish only UMR in place of all remote MACs hosted in remote DC/fabric/site. ?

*       This shall also mandate proxy-arp functionality on PE1 for the requests arising from the hosts (host1) in attached DC,

o   else request for same credentials (host2) shall flood the WAN from other attached hosts to the fabric.
Or there is something more to it.
>>>> https://datatracker.ietf.org/doc/html/rfc9014#section-3.5.2: ARP/ND Flooding Control<https://datatracker.ietf.org/doc/html/rfc9014#name-arp-nd-flooding-control>
The ARP/ND queries should also be proxied by PE's (PE1 and PE2) to the request generated from inside the attached DC/fabric, as it will save on flooding over WAN.
Anyways, PE shall absorb all the remote fabric info (RT-2's from remote fabrics) to realize UMR and shall avoid relaying it to the attached fabric/DC.

Any thoughts on above shall be great.

Regards,
Saumya.

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