Re: Long-standing practice of due-diligence is expected - Re: [spring] CRH is not needed - Re: How CRH support SFC/Segment Endpoint option?

Sander Steffann <sander@steffann.nl> Thu, 28 May 2020 14:58 UTC

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From: Sander Steffann <sander@steffann.nl>
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Subject: Re: Long-standing practice of due-diligence is expected - Re: [spring] CRH is not needed - Re: How CRH support SFC/Segment Endpoint option?
Date: Thu, 28 May 2020 16:58:16 +0200
In-Reply-To: <CAOj+MMH-1RbicwqHVueeokRq-FNm2QWkyCQXuyZdR2xFvdh13g@mail.gmail.com>
Cc: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>, "Zafar Ali (zali)" <zali@cisco.com>, Andrew Alston <Andrew.Alston@liquidtelecom.com>, Ron Bonica <rbonica=40juniper.net@dmarc.ietf.org>, "Henderickx, Wim (Nokia - BE/Antwerp)" <wim.henderickx@nokia.com>, "spring@ietf.org" <spring@ietf.org>, 6man <6man@ietf.org>
To: Robert Raszuk <robert@raszuk.net>
References: <75BF2317-5D28-4038-ABB1-31C588ACD165@cisco.com> <DM6PR05MB6348D86E8BE339067C5238E4AEB10@DM6PR05MB6348.namprd05.prod.outlook.com> <30C37AC0-B03A-45B1-BE0F-7E185361BBBC@liquidtelecom.com> <64e6b98b01c64ec8b699c065bc7ee9e0@boeing.com> <94DF5577-4DCC-4491-A12B-21EAC214172F@cisco.com> <aa7edfd5c56b4e2883e2e91649fc6061@boeing.com> <7A3F2E3E-687F-4C53-B1F9-1BF593356384@cisco.com> <45de95803b734d73a0288a09332c445f@boeing.com> <CAOj+MMH-1RbicwqHVueeokRq-FNm2QWkyCQXuyZdR2xFvdh13g@mail.gmail.com>
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Hi Robert,

> There can be a lot of acronymous or names invented but under the hood it 16, 32 or 20 bit opaque bit string in both CRH and SR-MPLS which is mapped to a rewrite string. No more no less.

So far so good

> And rfc8663 precisely automated such rewrite to UDP encapsulation.

And this is an important difference: some of us don't want encapsulation/tunneling, we want something that can be part of a non-encapsulated packet. There are use-cases where CRH used with encapsulating is the best solution, and there are cases where the packet itself can be steered without encapsulation. CRH allows both, and therefore covers more possible use-cases than RFC8663. This makes CRH a building block that some of us desire.

Cheers,
Sander