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Service Function Chaining (Active WG)
Rtg Area: Alvaro Retana, Deborah Brungard, Martin Vigoureux | 2013-Dec-20 —  
Chairs
 
 


IETF-104 sfc minutes

Session 2019-03-28 1610-1810: Congress Hall 3 - Audio stream - sfc chatroom

Minutes

minutes-104-sfc-00 minutes



          ===============================
          Service Function Chaining (SFC)
          IETF 104 - Prague
          Thursday, March 28, 2019
          16:10-18:10 (UTC+01:00)
          Meeting Minutes
          ===============================
          
          SFC WG chairs: Joel Halpern, Jim Guichard
          SFC secretary: Tal Mizrahi
          
          Meeting minutes: Tal Mizrahi
          
          
          Chair Slides
          ------------
          Presenter: Joel Halpern
          Slides:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-sfc-chair-slides-01
          
          
          Summary:
          - Note well was presented.
          - The agenda for the current session was presented.
          - WG progress was presented.
          - DC allocation is a WG draft. There has not been enough interest in
          the draft. If there is not enough interest we will let it die.
          - The MPLS SFC encapsulation draft was approved for publication by the
          IESG.
          - The draft about SPRING/NSH was presented and will likely be adopted.
          - There has not been enough attention to security by the working
          group. Proof of transit is related, but the working group needs more
          work on security. Need people to step forward.
          - The Service ID Header draft was adopted recently
          (draft-ietf-sfc-serviceid-header) - this draft requires attention to
          security. A question came up whether the draft should define its own
          security mechanism, or should the working group propose a generic
          solution.
          
          
          Network Service Header (NSH) Explicit Congestion Notification (ECN)
          Support (Donald Eastlake)
          ---------------------------------------------------------------------------------------------
          
          Draft:
          https://www.ietf.org/archive/id/draft-ietf-sfc-nsh-ecn-support-00.txt
          
          Presentation:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-sfc-ecn-and-congestion-feedback-00
          
          
          Summary:
          - This draft was recently adopted by the WG.
          - Plane to refine the draft, and then request WG last call.
          
          Discussion:
          - No questions or comments.
          
          
          Active OAM for Service Function Chains in Networks (Greg Mirsky)
          ----------------------------------------------------------------
          Draft:
          https://www.ietf.org/archive/id/draft-ietf-sfc-multi-layer-oam-02.txt
          
          Presentation:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-active-oam-for-sfc-networks-01
          
          
          Summary:
          - Draft was updated based on discussion in Bangkok.
          
          Discussion:
          - Greg: There was an update regarding the use of the 'O' bit. Requesting
          confirmation from the WG.
          - Joel: that will have to be confirmed on the mailing list.
          - Joel: if we get an echo request we can't parse, how do we know that
          it is an echo request, and do we have the information to return it to
          the correct source?
          - Greg: we will clarify this in the draft. It has to practical so the
          sender can understand the situation. We introduced two classes of TLVs:
          mandatory and optional. Will add clearer text.
          
          
          NSH Encapsulation for In-situ OAM Data, Proof of Transit (Frank
          Brockners)
          --------------------------------------------------------------------------
          
          Drafts:
                  https://tools.ietf.org/html/draft-ietf-sfc-ioam-nsh-01
                  https://tools.ietf.org/html/draft-ietf-sfc-proof-of-transit-02
          
          Presentation:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-ioam-nsh-encapsulation-and-proof-of-transit-00
          
          
          Summary:
          - IOAM in NSH:
            - No significant updates in the IOAM NSH draft. A bit of cleanup of
            the references.
            - Authors would like to ask the WG if the document is done.
          - POT:
            - The POT draft had a lot of dicussion on the mailing list. Based on
            this discussion: consolidated to a single security mechanism instead
            of two options.
            - Latest revision includes a lot of nit fixes and clarifications.
          
          Discussion:
          - Joel: you need to address the number of authors. Need to reduce it.
          - Joel: POT - we would like this document out the door. Question: do we
          want a separate YANG model for POT, and would it require a separate draft,
          or in the same draft?
          - Greg: it would make sense if POT was part of the SFC YANG model.
          - Joel: I recongnized that the POT YANG model is already done, and not
          sure we want to hold it back.
          - Frank: we can put the POT YANG in a separate draft. There is an
          advantage to separating it from the SFC YANG model, as it may be used
          in the future by non-SFC protocols.
          - Joel: Frank - can you please send a question to the list, and suggest
          how to proceed with the YANG model, and get feedback from the WG?
          - Frank: sure.
          
          
          SFC Path OAM (Ting Ao)
          ----------------------
          Draft:
          https://www.ietf.org/archive/id/draft-ao-sfc-oam-path-consistency-05.txt
          
          Presentation:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-sfc-consistency-oam-00
          
          
          Summary:
          - The draft was presented in previous meetings, and updated according
          to the comments.
          - The authors request WG adoption.
          
          Discussion:
          - No questions or comments.
          
          
          SFC YANG Model (Ting Ao)
          ------------------------
          Draft: https://www.ietf.org/archive/id/draft-ao-sfc-yang-00.txt
          
          Presentation:
          https://datatracker.ietf.org/meeting/104/materials/slides-104-sfc-sfc-yang-01
          
          
          Summary:
          - Received comments, and plan to update the draft accordingly.
          - Requesting comments and contributions from the WG.
          
          Discussion:
          - Jim: Renaldo Penno wrote an SFC YANG that has expired a long time
          ago. It was based on the VPP implementation. Have the authors reviewed
          this YANG model?
          - Ao: will look into it.
          - Frank Brockners: please look at the SFC YANG models in OpenDaylight,
          OPNFV. Please review what was implemented and see what can be learned
          from there.
          
          
          Adjourned at 16:48.
          
          



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