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[mpls] Comments on draft-cheng-mpls-inband-pm-encapsulation

Tarek Saad <tsaad@juniper.net> Tue, 21 July 2020 18:43 UTC

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From: Tarek Saad <tsaad@juniper.net>
To: "draft-cheng-mpls-inband-pm-encapsulation@ietf.org" <draft-cheng-mpls-inband-pm-encapsulation@ietf.org>
CC: "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: Comments on draft-cheng-mpls-inband-pm-encapsulation
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Date: Tue, 21 Jul 2020 18:43:16 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/IzHSWZ7kgRC0Q70FUYiuzx26xos>
Subject: [mpls] Comments on draft-cheng-mpls-inband-pm-encapsulation
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Hi authors,

I have the following comments/queries on this draft:

  1.  Using SFL approach, an egress could assign a unique transport label per flow. Hence, it would be possible to use the SFL label on a transit as well as on egress for flow identification purpose
  2.  Or, is the intention to identity flows when transported over the same LSP using same transport label?
  3.  I see a lot of similarity between Entropy Label and Flow Label. Both are assigned per flow (whatever the definition of a flow is). Currently, EL is assigned by ingress, but in theory it can be assigned by NMS (e.g. global too). What are your thoughts on using EL to identify a flow?
  4.  The draft does not discuss implications of device readable label depth on placement of FLI/FL (e.g. when SR Paths are used as transport)
  5.  The draft hints to leveraging TC bits in MPLS header to identify alternate markings for same flow.. This is indeed unusual and would be hard to standardize. Why can’t 2 flow-ID labels be allocated to the same flow for the purpose of alternate marking?
Regards,
Tarek




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