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[RTG-DIR]Re: Rtgdir early review of draft-ietf-mpls-rfc6374-sr-08

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Mon, 30 September 2024 15:03 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Rakesh Gandhi (rgandhi)" <rgandhi@cisco.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>
Thread-Topic: Rtgdir early review of draft-ietf-mpls-rfc6374-sr-08
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Date: Mon, 30 Sep 2024 15:03:32 +0000
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Subject: [RTG-DIR]Re: Rtgdir early review of draft-ietf-mpls-rfc6374-sr-08
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Hi Rakesh,

Sorry for following up on this late. This is also part of the RtgDir review of the -11 revision.
I want to focus on the following part and hence snipped the rest.

Please see zzh> below.

---------------------
I did not try to match the description between this document and the "base"
RFCs. So far I have not seen many differences besides the following:

- TTL
- Return Path TLV, presumably only applicable to SR-MPLS
- Block Number TLV, presumably not specific to SR-MPLS
- SR-P2MP

Am I missing anything?
<RG> FYI, the draft also describes:

  1.  the one-way/two-way/LB modes as applied to SR-MPLS.
Zzh> The two-way and LB modes do use SR-specific constructs, but what about the one-way? Is that SR-specific?
Zzh> Additionally, what’s the relationship between using Return Path TLV and using https://www.ietf.org/archive/id/draft-ietf-pce-sr-bidir-path-13.txt?

  1.  destination and source TLVs as applied to SR-MPLS.
Zzh> Why would this not apply to plain old MPLS?

  1.  Path segment for loss.
Zzh> The document says:
   In SR-MPLS networks, the query and response messages defined in
   [RFC6374] are sent as following:
   *  For delay measurement, the query messages MUST be sent on the same
      path as data traffic for links and end-to-end SR-MPLS paths to
      collect transmit and receive timestamps.
   *  For loss measurement, the query messages MUST be sent on the same
      path as data traffic for links and end-to-end SR-MPLS paths to
      collect transmit and receive traffic counters (e.g., for traffic
      received on the incoming link for the link packet loss and for the
      incoming Path Segment Identifier (PSID) [RFC9545] for the end-to-
      end SR-MPLS path packet loss).
Zzh> What is exactly different from plain old MPLS here? Don’t we always have to on the same path as data traffic regardless of MPLS and SR-MPLS?
Zzh> What is the implication of PSID here? What should the be procedure wrt PSID?
Zzh> I would like to see a summary at the beginning to list the things that are specific to SR-MPLS, and the new things added but applicable to the plain old MPLS.
Zzh> Thanks.
Zzh> Jeffrey


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