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[Srcomp] Draft Minutes Jan 27 2021

"Darren Dukes (ddukes)" <ddukes@cisco.com> Wed, 27 January 2021 16:53 UTC

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From: "Darren Dukes (ddukes)" <ddukes@cisco.com>
To: "srcomp@ietf.org" <srcomp@ietf.org>
Thread-Topic: Draft Minutes Jan 27 2021
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Date: Wed, 27 Jan 2021 16:52:55 +0000
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Subject: [Srcomp] Draft Minutes Jan 27 2021
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Attendees: Weiqiang, PSF, Cheng Li, Wim, Darren, Ron, Chongfeng

Minutes

  *   Analysis document will have authors listed in alphabetical order by last name.
  *   ACTION for team:
     *   Review backlog document
     *   Verify there are no missing requirements in the backlog
     *   Send all such requirements to the list by Friday
     *   Darren to add any to the backlog doc in git.
  *   PS or BCP requirement to be added to draft.
  *   IPv6 Based needs to be added to the draft.
     *   The text below has been discussed in the call
     *   ACTION: Team to discuss on the list (See two options below as discussed)
  *   ACTION: Weiqiang to send proposals to SPRING WG and request additional proposals.
     *   draft-filsfilscheng-spring-srv6-srh-comp-sl-enc
     *   draft-decraene-spring-srv6-vlsid
     *   draft-bonica-6man-comp-rtg-hdr
     *   draft-mirsky-6man-unified-id-sr


Short Name: IPv6 Based (Original + edited in call)
Description: The compression mechanism must be IPv6-based. The SR ingress node encapsulates its payload (e.g.., Ethernet, IP, TCP) in an IPv6 header.

The compression mechanism is either:
- Encoded in the IPv6 header
- Encoded in an IPv6 extension header that follows the IPv6 header.
- Encode in both.
The IPv6 header persists until it is removed by either by the SR egress node or a penultimate node.  Once the IPv6 header is completely processed and removed, it cannot be re-added.

Rational: The SR ingress node calculates routing and non-routing information regarding the SR path. Non-routing information includes:
-              DSCP bits
-              ECN bits
-              Flow label
-              Fragmentation information
-              Authentication information
-              Destination Options
-              Hop Count
The SR ingress node encodes routing and non-routing information in the IPv6 header and its extensions. If the IPv6 header were removed along the SR path, non-routing information would be lost.
Also, transit nodes may update the ECN bits in the IPv6 header. If the IPv6 header were removed, the ECN bits would be lost.


Metric: Non-routing information (e.g., DSCP, ECN, Destination Options) must be delivered from the source node to the destination node. It must not be delivered to an upper-layer protocol for the purposes of including it in a new IPv6 header.


Short Name: IPv6 Based (Darren’s draft proposal)
Description: The compression mechanism must be IPv6-based (within an IPv6 header or extension header). The SR ingress node encapsulates its payload (e.g.., Ethernet, IP, TCP) in an IPv6 header. The compression mechanism MUST not lose non-routing information in the IPv6 header within the SR domain.

Rationale: The IPv6 header carries information within the SR domain, including; DSCP bits, ECN bits, Flow label, Fragmentation and Authentication information, Destination Options, Hop Count.  Losing this information can result in failures.

Metric: A proposal that can preserve non-routing information in the IPv6 header within the SR Domain satisfies this requirement.

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