Re: [mpls] MPLS-RT review of draft-bryant-mpls-sfl-framework-04

Eric C Rosen <erosen@juniper.net> Thu, 11 May 2017 15:11 UTC

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To: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>, "mpls@ietf.org" <mpls@ietf.org>, "draft-bryant-mpls-sfl-framework@ietf.org" <draft-bryant-mpls-sfl-framework@ietf.org>
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From: Eric C Rosen <erosen@juniper.net>
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Date: Thu, 11 May 2017 11:04:39 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/gPowvMWWiZocQj-qYkTc0BhaBIM>
Subject: Re: [mpls] MPLS-RT review of draft-bryant-mpls-sfl-framework-04
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On 5/10/2017 7:00 AM, Bocci, Matthew (Nokia - GB) wrote:
> The EL is effectively saying “all other things being equal, here is 
> some additional information to distinguish flows”. It is in addition 
> to, but not an alternative to the rest of the label stack.

Do you think there is any situation in which (a) one has given the same 
EL value to two packets, but (b) one would be perfectly happy to see the 
packets delivered out of order?   Or to put it another way, once an 
ingress node has assigned a particular EL value to a particular set of 
packets, is there any advantage to including other fields in the ECMP hash?

> I don’t think that it is reasonable to mandate that LSRs only consider 
> the EL and ignore all other labels in the stack given the impact on 
> the deployed base

Certainly one cannot mandate the deployed base to be other than it is, 
but it would be interesting to know whether the common implementation is 
really the preferred behavior.