Re: [CCAMP] draft-ali-ccamp-lsp-inquiry-00

"Zafar Ali (zali)" <zali@cisco.com> Wed, 31 July 2013 09:27 UTC

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From: "Zafar Ali (zali)" <zali@cisco.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "'Khuzema Pithewan'" <kpithewan@infinera.com>, "'CCAMP'" <ccamp@ietf.org>
Thread-Topic: [CCAMP] draft-ali-ccamp-lsp-inquiry-00
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Date: Wed, 31 Jul 2013 09:26:45 +0000
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Subject: Re: [CCAMP] draft-ali-ccamp-lsp-inquiry-00
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Hi Adrian/ Khuzema:

Inquiry LSP is a "control plane LSP" which is setup using tunnel Tspec and non-null (actual) labels in Path/ Resv. Resource availability is examined but the resources are NOT committed in the data plane (e.g., no XC).

Thanks

Regards … Zafar

From: "adrian@olddog.co.uk<mailto:adrian@olddog.co.uk>" <adrian@olddog.co.uk<mailto:adrian@olddog.co.uk>>
Reply-To: "adrian@olddog.co.uk<mailto:adrian@olddog.co.uk>" <adrian@olddog.co.uk<mailto:adrian@olddog.co.uk>>
Date: Wednesday, July 31, 2013 5:04 AM
To: 'Khuzema Pithewan' <kpithewan@infinera.com<mailto:kpithewan@infinera.com>>, "ccamp@ietf.org<mailto:ccamp@ietf.org>" <ccamp@ietf.org<mailto:ccamp@ietf.org>>
Subject: Re: [CCAMP] draft-ali-ccamp-lsp-inquiry-00

Right, Khuzema, you caught the right piece of text.

The point here is that the LSP is *not* set up in the data plane if it has a different label. All that is happening is that the LSP-ID and state is being set up in the control plane.

I may have said it before <snarkle> but it is massively helpful for people to pay close attention to whether they mean "control plane LSP" or "data plane LSP" when they say "LSP".

A

From: ccamp-bounces@ietf.org<mailto:ccamp-bounces@ietf.org> [mailto:ccamp-bounces@ietf.org] On Behalf Of Khuzema Pithewan
Sent: 30 July 2013 15:25
To: CCAMP (ccamp@ietf.org<mailto:ccamp@ietf.org>)
Subject: [CCAMP] draft-ali-ccamp-lsp-inquiry-00

Authors,

The draft relies on ability to setup GMPLS lsp without committing resources in dataplane.

Only reference I found to setup pre-planned GMPLS is in RFC 6001.

The green highlighted part says it is not possible to support 0 bandwidth lsp for TDM/LSC network. While red part alludes that it can be done.

Also I couldn’ locate the text in any RFC that describes the NULL label behavior in GMPLS context.


RFC6001 5.2.2 says

…………….snip……………….

However, mechanisms for provisioning (pre-planned or not) a TDM or
   LSC LSP with 0 bandwidth is currently not possible because the
   exchanged label value is tightly coupled with resource allocation
   during LSP signaling (e.g., see [RFC4606] for a SONET/SDH LSP).  For
   TDM and LSC LSP, a NULL Label value is used to prevent resource
   allocation at the data plane level.  In these cases, upon LSP
   resource commitment, actual label value exchange is performed to
   commit allocation of timeslots/ wavelengths.

…………………..snip………………..


Khuzema