Minutes IETF104: sfc

Meeting Minutes Service Function Chaining (sfc) WG Snapshot
Title Minutes IETF104: sfc
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Last updated 2019-03-28

Meeting 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

- 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


- This draft was recently adopted by the WG.
- Plane to refine the draft, and then request WG last call.

- 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


- Draft was updated based on discussion in Bangkok.

- 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)


- 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.

- 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


- The draft was presented in previous meetings, and updated according to the
comments. - The authors request WG adoption.

- No questions or comments.

SFC YANG Model (Ting Ao)
Draft: https://www.ietf.org/archive/id/draft-ao-sfc-yang-00.txt


- Received comments, and plan to update the draft accordingly.
- Requesting comments and contributions from the WG.

- 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.