Subject: [Pce] NEXT STEP of draft-wu-pce-traffic-steering-sfc

From: Qin Wu <[email-masked]>
Date: Wed, 23 Dec 2015 07:24:51 +0000

Hi, folks:
If you didn't follow the discussion on SFC mailing list, I like to draw your attention that SFC control
plane architecture adopted as a WG draft in August 2015 triggered a lot of
SFC control plane requirements discussions that are related to draft-wu-pce-traffic-steering-sfc-07.
https://mailarchive.ietf.org/arch/msg/sfc/0H-H4BhyN0Nuroev_0hd5CMKOYM
https://mailarchive.ietf.org/arch/msg/sfc/CVU-H4hP9kQD0CoLMHw9jYfZ0M4
https://mailarchive.ietf.org/arch/msg/sfc/3fy9X1VmGN6V6GIT_QMDXrXwVkY

1.       The relationship between SFC,SFP and RSP was clarified, the control plane operating on SPF IDs rather than SFC ID got agreed.

2.       Service Chaining work doesn't requires correlating service path IDs with service chain IDs within the data plane. The relationship of paths to chains falls in the control plane.

3.control-plane requirements defined in SFC control plane architecture allows to instruct a loose path (SFP) or a strict path (RSP),whether a full path is specified within a domain or
if it is deferred to SFFs is really deployment-specific.

4.In addition, Encoding the Exact SFF-SF-sequence in Data Packets and Fully Controlled SFF-SF-Sequence for a SFP were also discussed on the list
and two new sections 4.10.4 and 4.10.5 were added into version (-02) of draft-ietf-sfc-control-plane to discuss RSP related aspect.

( Referring to Section 2.3.1 of RFC7665,
we can see RSP specify exact sequence of SFFs and SFs that the packets will actually visit and SFF/SF locators while SFP may be fully constrained or partial constrained and is
constrained version of the original SFC. )

draft-wu-pce-traffic-steering-sfc-07 is a draft that provides a solution to SFC control plane requirements on RSP, SFC, SFP which was discussed on the SFC mailing list.
We authors plan to make revision to draft-wu-pce-traffic-steering-sfc to capture all the discussing points in the SFC ML and get in line with the draft-ietf-sfc-control-plane adopted recently in SFC WG.
Let us know if you have any comments/suggestion/inputs on this topic.

Also wish you have a good holiday in Christmas.:-)

Regards!
-Qin