[bess] A couple of question about draft-ietf-bess-evpn-ac-aware-bundling

[Alexander Vainshtein <[e-mail]>]

Hi,
I have a couple of question about the AC-aware bundling draft<https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-ac-aware-bundling-04> .
The background for these questions is given below.


  1.  Section 6.2 of RFC 7432<https://datatracker.ietf.org/doc/html/rfc7432#section-6.2> that defines VLAN Bundle Service Interface says that "MAC addresses MUST be unique across all VLANs for that EVI in order for this service to work" .
     *   This requirement is not limited to multihomed PEs
     *   No mechanisms for enforcement of this requirement (e.g., by detecting and handling of possible violations) are defined
     *   Any manipulation of VLAN tags is strictly prohibited with this service interface
  2.  The draft in question defines a similar requirement and effectively provides a way to enforce it. However:
     *   Detection of misconfiguration is explicitly limited to just multihomed PEs (as can be seen from the title of Section 5)
     *   The draft does not impose any limitations on VLAN manipulation (this is expected in the case of inter-subnet traffic (with each subnet differentiated by a VLAN) within a single broadcast domain)
     *   The draft seems to deal just with the situation in which multiple subnets in the same broadcast domain are differentiated by VLANs.
And now my questions:

Q1: What is the rationale for restricting detection and handling of violation of the above-mentioned rule to just multi-homed PEs?
Q2: Does the draft support the situations in which multiple IP subnets in the same broadcast domain are NOT differentiated by different VLANs?
Q3: Is VLAN translation with AC-aware bundling service interface allowed for intra-subnet traffic that undergoes "pure Layer 2 switching" in the single broadcast domain?

Your feedback would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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