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Re: [mpls] SR-MPLS Service Programming usecase for Open DT

Haoyu Song <haoyu.song@futurewei.com> Mon, 20 September 2021 15:48 UTC

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From: Haoyu Song <haoyu.song@futurewei.com>
To: "liu.yao71@zte.com.cn" <liu.yao71@zte.com.cn>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] SR-MPLS Service Programming usecase for Open DT
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Date: Mon, 20 Sep 2021 15:48:26 +0000
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Subject: Re: [mpls] SR-MPLS Service Programming usecase for Open DT
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Hi Yao,

I think what you described has been covered in the "network programming" use case on the wiki page,
https://trac.ietf.org/trac/mpls/wiki/Usecases, which is more akin to SRH in SR.

Best,
Haoyu

-----Original Message-----
From: mpls <mpls-bounces@ietf.org> On Behalf Of liu.yao71@zte.com.cn
Sent: Thursday, September 16, 2021 1:40 AM
To: mpls@ietf.org
Subject: [mpls] SR-MPLS Service Programming usecase for Open DT

Hi DT,

Besides the requirement in NSH Based SFC usecase in the wiki to carry path ID and metadata by embedding NSH in EH.
There's also a need to carry metadata in SR service programming with SR-MPLS data plane.

The reference is draft-ietf-spring-sr-service-programming. SR service programming is a mechanism to achieve SFC in SR-MPLS and SRv6 networks without the use of NSH.

In this draft, there's a requirement to carry metadata in SR-MPLS data plane, some possible methods to carry metadata (e.g, defining an SRH-like header with only the mandatory fields required to carry metadata) and to indicate the presence of metadata(e.g, adding the indication in the semantic of the service SIDs, or introducing a protocol identifier in the MPLS packet) are proposed but not standardized.
As for the path ID, although not mentioned in this draft, I think there's a potential need for it to let the SFFs distinguish between different SFPs.

Maybe after discussion the solution for this usecase is similar to that for NSH Based SFC, but I think this usecase should be taken into consideration.

Regards,
Yao

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