Re: [CCAMP] OVRLY - signaling extensions

"Adrian Farrel" <adrian@olddog.co.uk> Wed, 12 March 2014 22:56 UTC

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From: "Adrian Farrel" <adrian@olddog.co.uk>
To: "'John E Drake'" <jdrake@juniper.net>, "'Igor Bryskin'" <IBryskin@advaoptical.com>, "'Gert Grammel'" <ggrammel@juniper.net>, "'Vishnu Pavan Beeram'" <vishnupavan@gmail.com>, "=?UTF-8?Q?'Pawe=C5=82_Brzozowski'?=" <PBrzozowski@advaoptical.com>
References: <650AA355E323C34D9D4AAEED952E053D3FC6BBEA@SV-EXDB-PROD2.infinera.com> <F82A4B6D50F9464B8EBA55651F541CF85CAD5E4C@SZXEMA504-MBS.china.huawei.com> <650AA355E323C34D9D4AAEED952E053D3FC6D4AE@SV-EXDB-PROD2.infinera.com> <132301cf3bd5$cf0a8640$6d1f92c0$@olddog.co.uk> <8f71d3e2fb1f47e7858721caf9f894a7@MUC-SRV-MBX1.advaoptical.com> <16a401cf3ca2$00152cf0$003f86d0$@olddog.co.uk> <7d1ddc68ad6b4e2d9c5acf3dc2ea1e39@MUC-SRV-MBX1.advaoptical.com>, <CA+YzgTty-DyVZeAAHg-HJ=zNXSgUhn-kNx3SMOP5fj4JGrbSpQ@mail.gmail.com> <CDAC6F6F5401B245A2C68D0CF8AFDF0A403E4E05@atl-srv-mail10.atl.advaoptical.com>, <894b29b7f910464abe87665c24954fef@BN1PR05MB041.namprd05.prod.outlook.com> <CDAC6F6F5401B245A2C68D0CF8AFDF0A403E4F15@atl-srv-mail10.atl.advaoptical.com>, <35ec64e441df4d20975f11997c16de06@BLUPR05MB562.namprd05.prod.outlook.com> <CDAC6F6F5401B245A2C68D0CF8AFDF0A403E4F3E@atl-srv-mail10.atl.advaoptical.com> <78242e7dd7974481bb53dc14849e0d04@BLUPR05MB562.namprd05.prod.outlook.com>
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Date: Wed, 12 Mar 2014 22:55:41 -0000
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Cc: 'CCAMP' <ccamp@ietf.org>
Subject: Re: [CCAMP] OVRLY - signaling extensions
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Backing off a bit, and catching something Dieter said.

I have a bit of a grump about the UNI being seen as a "service request interface." In my book it is a "connection request interface" and I see that as fundamentally different.

The range of I-Ds we are seeing that "enhance" the UNI are understandable (there is deployed code that needs to be made to do things) but are all rooted in the fact that the UNI was never intended to do the things that folk want to do with it. We can see this if we go way back to the original dual-homed destination UNI-C problem that surfaced in OIF work.

The solution in my world view is to recognise that the service request is somewhere else and gives rise to a number of connections that can be requested at the UNI. I think this model addresses even Dieter's dual-ingress problem.

Now, once upon a time back when 3475 was still a twinkle in Lou's now-cloudy-and-red eye, there was a bit of a discussion about whether GMPLS was used to request a service or set up an LSP. The conclusion I recall then was that it set up LSPs, and I don't think anything really changed. Of course, this does not mean that the service request interface could not be realised using RSVP-TE, just that up-to-now there has been no such interface. My belief is that we are stretching reality to make that interface the UNI, and while I completely understand the drive to keep modifying and shipping, I would also like to have an architectural view that is a little less prone to "continual enhancement".

Cheers,
Adrian