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[bess] Issues w/ draft-boutros-bess-elan-services-over-sr

"Ali Sajassi (sajassi)" <sajassi@cisco.com> Thu, 19 November 2020 20:21 UTC

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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: "bess@ietf.org" <bess@ietf.org>
CC: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
Thread-Topic: Issues w/ draft-boutros-bess-elan-services-over-sr
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Date: Thu, 19 Nov 2020 20:21:42 +0000
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Subject: [bess] Issues w/ draft-boutros-bess-elan-services-over-sr
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Sami,

Since we didn’t have time to discuss the issues during the BESS meeting, let me explain and elaborate them here:

The draft states the following two main objectives for its purpose but both have been addressed already !!


  1.  Reducing # of PWs in VPLS:
     *   VPLS (both BGP and LDP) is a 20-year old technology which is getting deprecated and many providers (SP, DC, and EN) are moving toward EVPN. However, a few years after VPLS (about 15 years ago) we introduced PBB-VPLS (RFCs 7041 and 7080) to address the PW scale issues along with few other things.
  2.  Reducing # of EVPN MAC route advertisements:
     *   This may have been an issue 10 years ago and that’s why we introduced simultaneously both EVPN and PBB-EVPN (RFC 7623) but not anymore. PBB-EVPN uses data-plane learning and it uses concepts of service-id, source B-MAC (for MAC learning) and destination B-MAC (for BUM ID), and same concepts are used in your draft. Furthermore RFC 7623 supports All-Active multi-homing as well as Single-Active with all the improvements that came later including per-ISID c-mac flushing that Jorge presented during the call. Needless to say that PBB-EVPN is transport agnostic and can work with SR, MPLS, TE, etc.

So,  my question is that: what is the point of this draft? Are you trying to have a bit more compressed header over what we currently have in PBB-EVPN because in terms of functionality, I don’t see much difference. However, I see even more issues than PBB-EVPN such as IRB handling  and Unequal load-balancing  for an ES.

The idea of breaking a PW in to three components of service-id, source-id, and dest-id has been around for almost twenty years. I introduced mvpls draft in 2002, followed by PBB-VPLS. VxLAN RFC (which also talks about data-plane learning) is along the same idea introduced in 2010. And finally PBB-EVPN in 2012. So, why do we need to re-invent the wheel again?

-Ali

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