Re: [Lsr] draft-ietf-isis-mpls-elc-07

Uma Chunduri <uma.chunduri@futurewei.com> Tue, 10 September 2019 18:20 UTC

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From: Uma Chunduri <uma.chunduri@futurewei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] draft-ietf-isis-mpls-elc-07
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Date: Tue, 10 Sep 2019 18:20:50 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/o1aC5vppaomEbWeS_afrrIKqE74>
Subject: Re: [Lsr] draft-ietf-isis-mpls-elc-07
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Though [I-D.ietf-mpls-spring-entropy-label<https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-08#ref-I-D.ietf-mpls-spring-entropy-label>] is been referred in the introduction of this draft the point of dual semantics (readable depth + action) for this MSD is not coming out clear in this document.


It would be useful to specify the same.


--
Uma C.

From: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Sent: Wednesday, August 28, 2019 1:59 PM
To: Acee Lindem (acee) <acee@cisco.com>om>; Uma Chunduri <uma.chunduri@futurewei.com>om>; lsr@ietf.org
Subject: RE: [Lsr] draft-ietf-isis-mpls-elc-07

Point taken…

  Les

From: Acee Lindem (acee) <acee@cisco.com<mailto:acee@cisco.com>>
Sent: Wednesday, August 28, 2019 1:56 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>; Uma Chunduri <uma.chunduri@futurewei.com<mailto:uma.chunduri@futurewei.com>>; lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] draft-ietf-isis-mpls-elc-07

Les,

Then what you meant in your response was, “generic RLD” as opposed to “generic MSD”.

Thanks,
Acee




From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>
Date: Wednesday, August 28, 2019 at 4:46 PM
To: Acee Lindem <acee@cisco.com<mailto:acee@cisco.com>>, Uma Chunduri <uma.chunduri@futurewei.com<mailto:uma.chunduri@futurewei.com>>, "lsr@ietf.org<mailto:lsr@ietf.org>" <lsr@ietf.org<mailto:lsr@ietf.org>>
Subject: RE: [Lsr] draft-ietf-isis-mpls-elc-07

Acee –

I do understand the question – and I believe the reference I cited provides the answer. You need to read the referenced draft.

If you have a cogent argument why it is safe to assume that the combination of actions required to support EL translate to any other type of activity that might be required on a label stack, please make it. Then Uma’s suggestion might make sense.

   Les

From: Acee Lindem (acee) <acee@cisco.com<mailto:acee@cisco.com>>
Sent: Wednesday, August 28, 2019 1:34 PM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>; Uma Chunduri <uma.chunduri@futurewei.com<mailto:uma.chunduri@futurewei.com>>; lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] draft-ietf-isis-mpls-elc-07

Hi Les,
I think the question is whether there can be a single RLD depth MSD rather than a RLD solely for entropy label discovery.
Thanks,
Acee

From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> on behalf of "Les Ginsberg (ginsberg)" <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>
Date: Wednesday, August 28, 2019 at 4:29 PM
To: Uma Chunduri <uma.chunduri@futurewei.com<mailto:uma.chunduri@futurewei.com>>, "lsr@ietf.org<mailto:lsr@ietf.org>" <lsr@ietf.org<mailto:lsr@ietf.org>>
Subject: Re: [Lsr] draft-ietf-isis-mpls-elc-07

Uma –

Please read https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-12#section-4<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-mpls-spring-entropy-label-12%23section-4&data=02%7C01%7Cuma.chunduri%40futurewei.com%7Cff6dd7fc7f384fa669f808d72bfa923b%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637026227508613167&sdata=jN5BbkqK3%2FuLOyfIf7nhm4cX8wKxy%2FudEDUMR6NX9ag%3D&reserved=0>

In short, we do not assume that EL Load Balancing can be performed for generic MSD.

Thanx.

   Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of Uma Chunduri
Sent: Wednesday, August 28, 2019 11:38 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] draft-ietf-isis-mpls-elc-07

Can anybody tell what was the conclusion (if any) in previous discussions in various WGs on why the readable label depth in an LSR has to be entropy label specific ?

IOW can we just modify this as “readable label depth” as opposed to “entropy readable label depth” ?
This would allow any other special purpose label inserted in the stack and would be at par with current MSD type “Base MPLS Imposition MSD” ( https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.iana.org%2Fassignments%2Figp-parameters%2Figp-parameters.xhtml&data=02%7C01%7Cuma.chunduri%40futurewei.com%7Cff6dd7fc7f384fa669f808d72bfa923b%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637026227508623162&sdata=GYeLpP05mnwKBOxC2tJJ1wxkwcm%2Bip401xzFgIdE1ME%3D&reserved=0> ).


--
Uma C.