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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> Thu, 12 January 2023 18:56 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Robert Raszuk <robert@raszuk.net>
CC: Susan Hares <shares@ndzh.com>, "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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Date: Thu, 12 Jan 2023 18:56:44 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/HuxNAzvjnO58B51wLBvR2mzsKCg>
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,

This does not exclude the SAFI 73 way. Either of the following can be used:


  *   Use SAFI 73 to pre-install an sr-policy, and then reference the installed sr-policy when advertising the service route.
  *   Spell out the sr-path directly when advertising the service routes, w/o pre-installing an sr-policy first.

Thanks.

Jeffrey



Juniper Business Use Only
From: Robert Raszuk <robert@raszuk.net>
Sent: Wednesday, January 11, 2023 2:08 PM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: Susan Hares <shares@ndzh.com>; 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]

Jeffrey,

I am saying that existing IDR document (draft-ietf-idr-segment-routing-te-policy) covers already what is defined in this subject draft and I do not see why extensions defined in SAFI 73 could not be used as is to address requirements of steering to tunnel egress.

Zzh4> The above cannot use the existing "sr-policy tunnel" because the sr-policy tunnel is used to setup the tunnel (on the ingress) using SAFI 73, while in the above use cases we're telling that certain service routes or multicast state (with different SAFIs) use a particular sr-mpls path.

If we go by this then any use of SAFI 73 would be unnecessary as you would instead carry service routes with their own policies.

That sounds like a highly unscalable approach to use embedded into service routes underlay paths.

Instead the current SR architecture recommends to carry just the color in service routes which in turn can be use to match colors in SR policy paths.

So you are proposing to skip SAFI 73 and carry it directly in service paths. Isn't this layer violation ?

In any case, Gyan and I presented our concern. Time for other WG members to provide their opinion as well as get feedback from SPRING WG as this model directly "extends" the SR architecture.

Kind regards,
Robert

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