[bess] A questions about Section 5.2.3 of draft-ietf-bess-rfc8317bis

[Alexander Vainshtein <[e-mail]>]

Hi all,
Section 5.2.3 of the 8317bis draft<https://datatracker.ietf.org/doc/html/draft-ietf-bess-rfc8317bis-00#section-5.2.3>  defines handling of BUM traffic received from a Leaf AC on a multi-homed Ethernet Segment.

The text of this section (and the text of its predecessor, Section 4.2.3 of RFC 8317) is based on an assumption that "while different ACs (VLANs) on the same ES could have a different Root/Leaf designation (some being Roots and some being Leaves), the same VLAN does have the same Root/ Leaf designation on all PEs on the same ES".

I wonder what is expected to happen if this assumption is broken - either due to an error, or in a transient state when the operator changes designation of a given VLAN from Root to Leaf on multiple PEs attached to the same MH ES?

Specifically:

  1.  Do you think that violation of this assumption should be detected and reported to the operator? If yes, could you possibly suggest how this condition can be detected?
  2.  What, if anything, should be done to prevent traffic from returning to the same customer site from which it has originated?

Your feedback would be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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