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Re: [Idr] WG adoption of draft-zzhang-idr-tunnel-encapsulation-label-stack-01 - 12/23/2022 to 1/13/2023

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Tue, 27 December 2022 21:22 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Robert Raszuk <robert@raszuk.net>, Susan Hares <shares@ndzh.com>
CC: "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] WG adoption of draft-zzhang-idr-tunnel-encapsulation-label-stack-01 - 12/23/2022 to 1/13/2023
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Subject: Re: [Idr] WG adoption of draft-zzhang-idr-tunnel-encapsulation-label-stack-01 - 12/23/2022 to 1/13/2023
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Hi Robert,

Please see zzh> below.



Juniper Business Use Only
From: Robert Raszuk <robert@raszuk.net>
Sent: Friday, December 23, 2022 4:14 PM
To: Susan Hares <shares@ndzh.com>; Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: idr@ietf.org
Subject: Re: [Idr] WG adoption of draft-zzhang-idr-tunnel-encapsulation-label-stack-01 - 12/23/2022 to 1/13/2023

[External Email. Be cautious of content]

Dear Sue and Jeffrey,

Could you clarify what is missing for networks running standard based SR-MPLS which this spec would enable ?
Or is this proposal an attempt to provide apparatus to achieve SR-MPLS-LIGHT by simply using Tunnel Encapsulation Attribute ?

Zzh> As the abstract says:

   RFC 9012 defines an MPLS Label Stack sub-TLV for Tunnel Encapsulation
   Attribute, and specifies that it is to be pushed BEFORE other labels.
   This document clarifies the use case for that, defines a new Tunnel
   Label Stack sub-TLV for a label stack to be pushed AFTER other labels
   (e.g., the label embedded in the NLRI for a labeled address family,
   and/or the stack in an MPLS Label Stack sub-TLV), and defines two new
   Segment sub-TLVs to encode a segment list in a compact format.

Zzh> It does three things:
Zzh> a). Section 1 clarifies the use case for pushing the label stack BEFORE other labels (RFC9012 does not explain why it is BEFORE; it is a bit confusing because it is counter intuitive unless the use case is explained) - for traffic steering AFTER the tunnel end point.
Zzh> b). Section 2 defines another TLV to specify a label stack to be pushed AFTER labels, for traffic steering TO the tunnel end point.
Zzh> c). Section 3 defines two new segment sub-TLVs for compact encoding of segment lists
Zzh> a) is clarification, c) is optimization, and b) is for a missing functionality.
Zzh> Thanks.
Zzh> Jeffrey

Many thx,
Robert


On Fri, Dec 23, 2022 at 7:36 PM Susan Hares <shares@ndzh.com<mailto:shares@ndzh.com>> wrote:
This begins a 3 week WG adoption and IPR call for draft-zzhang-idr-tunnel-encapsulation-label-stack-01.txt
https://datatracker.ietf.org/doc/draft-zzhang-idr-tunnel-encapsulation-label-stack/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-zzhang-idr-tunnel-encapsulation-label-stack/__;!!NEt6yMaO-gk!DPaxTk6WPrSXFhTPgxr9Z-xwL104sML2LJOJaFhSUlumFLm0YtHdkW0hisVw0zyCLe5MTxhMpmvfA60Z$>

The Authors should send an IPR statement regarding this draft.


   RFC 9012 defines an MPLS Label Stack sub-TLV for Tunnel Encapsulation
   Attribute, and specifies that it is to be pushed BEFORE other labels.
   This document clarifies the use case for that, defines a new Tunnel
   Label Stack sub-TLV for a label stack to be pushed AFTER other labels
   (e.g., the label embedded in the NLRI for a labeled address family,
   and/or the stack in an MPLS Label Stack sub-TLV), and defines two new
   Segment sub-TLVs to encode a segment list in a compact format.

The IDR shepherd for this draft is Jie Dong.

Cheerily, Sue

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