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Source Packet Routing in Networking (Active WG)
Rtg Area: Alvaro Retana, Deborah Brungard, Martin Vigoureux | 2013-Oct-25 —  

IETF-108 spring minutes

Session 2020-07-27 1100-1240: Room 3 - Audio stream - spring chatroom


minutes-108-spring-01 minute

          IETF 108 Spring WG Minutes
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          IETF 108 Spring WG Meeting  MinutesMonday, 11:00-12:40, July 27, 2020
          (UTC)o SPRING Status      [ 15 minutes ]
          - Note Well
          - Scribe
          - Document StatusDuring the chair presentation, the SR over IPv6
          Compression Design Team
          deliverables were discussed.  It was clarified that the chairs are
          not asking
          the DT to select a solution, but after producing requirements to compare
          the solutions.
          Cheng Li (Huawei): The second draft is an analysis draft instead of a
          comparison draft. Confirmed by Bruno.o Segment Routing Policy Architecture
          [ 10 minutes ]
          Ketan TalaulikarBruno: It is important to review this draft since it is
          an important draft for the WG.o Service Programming with Segment Routing
          [  5 minutes ]
          Francois Clad-no comments-o SR over IPv6 compression - Design Team work
          plan [  5 minutes ]
          Weiqiang & SanderBruno: It would be better to have the first result
          presented by 15th September.
          Andrew Alston: Comment on the time frame. Nine-month is a long time,but
          operators are desperate about the outcomes, whether there is way to
          shorten the time consumed.
          Weichang: The time frame has been agreed by the team. To work more
          efficiently may help.o Export of MPLS Segment Routing Label Type
          Information in      [  5 minutes ]
          IP Flow Information Export (IPFIX)
          Thomas GrafBruno: A short email to the lsr WG regarding the IANA
          allocation for ospfv2 and ospfv3 whether one for each or just one.o
          Seamless Segment Routing   [ 10 minutes ]
          Shraddha HegdeJie Dong: SR is used as one type of the tunnels, RSVP-TE
          can also be used, why is it called as seamless SR?
          Shraddha: Interworking with other SR technologies, this is the reason
          for the name.
          Jie: But it can be more broader than SR.
          Shraddha: We can think about renaming it.
          Jie: There are extensions in the IDR WG. Is this draft a STDs or Info?
          Shraddha: it goes to STDs track, including architecture and requirements.
          Jie: Any changes to the SR architecture?
          Shraddha: No. It is mainly about how to connect multiple domains
          with BGP-based mechanisms.o Point-to-Multipoint Transport Using Chain
          Replication in Segment Routing   [ 10 minutes ]
          Yimin Shen-no show and no time left at the end-o Enhanced Performance
          Delay and Liveness Monitoring in Segment Routing Networks [  10 minutes ]
          Rakesh GandhiGreg Mirsky: What are you Monitoring?
          Rakesh: SR Path. Probes follow the same data path of the SR Policy
          Greg: Is it to replace BFD?
          Rakesh: It is enhanced monitoring, using the existing TWAMP mechanisms
          at the same time.
          Greg: How do you check continuity?
          Rakesh: Probe message along the SR path. If lost messages, liveness
          declared failed. Simple TWAMP leveraging, the packet format can be the
          same or different.
          Greg: confusing. How Liveness scope is defined? Neither TWAMP or STAMP
          has the information.
          Rakesh: Reflector is unaware of TWAMP or STAMP in loopback mode. Just
          using its message format.
          Greg: how the reflector know the rate
          Rakesh: There is no signalling, all based on the local provisioning. Probe
          packets are fast forwarded, no state or knowledge of the protocol on
          reflector. Rate limiting is not needed as packets are not punted on
          the reflector.
          Greg: path continuity, the session is up. confusing statement.
          Rakesh: Probes simply fast forwarded by the reflector that is why it is
          unaware of the state.
          Greg: loopback mode is confusing.
          Rakesh: Reflector just forwards packets in loopback mode without punting
          and re-injecting.
          Greg: TWAMP and STAMP do not have liveness.
          Rakesh: It does not have to be based on the existing mechansims
          Greg: new protocols?
          Rakesh: reusing TWAMP packet format. It’s not forbidden!
          Bruno: please continue on the mailing list.Andrew: can see a lot of use
          cases, especially actual timing across the path. It is currently tied
          to the TWAMP and STAMP at this moment in Section 5.2.
          Rakesh: will consider updating the section. Using PM probes for delay,
          Liveness comes for free.o Performance Measurement Using STAMP for Segment
          Routing Networks       [ 10 minutes ]
          Rakesh GandhiGreg: 1. introducing the control code, encourage the SPRING
          Chairs to discuss with the IPPM Chairs.
          2. standalone LM message, why not use rfc 8762 and sequence number?
          Rakesh: 1. have been keeping IPPM WG in the loop. Also, presenting the
          updates to IPPM on Friday.
          2. meeting got disconnected.o Performance Measurement Using TWAMP Light
          for Segment Routing Networks    [  10 minutes ]
          Rakesh Gandhi-no time to present-

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