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Re: [manet] Question about draft-ietf-manet-dlep-traffic-classification-05

Lou Berger <lberger@labn.net> Thu, 22 July 2021 19:23 UTC

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To: "Rogge, Henning" <henning.rogge@fkie.fraunhofer.de>, "manet@ietf.org" <manet@ietf.org>
Cc: "Velt, R. (Ronald) in 't" <Ronald.intVelt@tno.nl>
References: <1625729404690.75041@fkie.fraunhofer.de>
From: Lou Berger <lberger@labn.net>
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Date: Thu, 22 Jul 2021 15:23:44 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/manet/xnFySbf5L8i0Lkzkw4lPdu6QyUM>
Subject: Re: [manet] Question about draft-ietf-manet-dlep-traffic-classification-05
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Sorry about the delayed response. See below.

On 7/8/2021 3:30 AM, Rogge, Henning wrote:
> Hi,
>
> I just remembered a discussion with Ronald I had about the traffic classification draft during a few weeks ago.
>
> Do I understand the draft correctly that it introduces the "Traffic Class Identifier" as a new "unique key" for destinations (announcing that the attached metrics/prefixes of this destinations are meant for different semantics)?
Yes.
> If yes I think that this is unnecessary complex (introducing new unique keys is always a mayor issue for DLEP implementations), because we already have the Link-ID TLV to announce an arbitrary number of different destinations per MAC address. I would suggest not changing the traffic-classification draft, but just add that a TC must also have a mandatory unique Link-ID... this makes implementing this draft combined with Link-ID support much easier.
>
I've been grappling with this and I think you are basically saying 
replace the the TID with the LID.  At one level this sounds like a good 
idea, but in looking at how to change the TC draft to effect this change 
it seems to be that we'd need to change the base specification (RFC8703) 
to allow for operation with normal endpoints (without Layer 3 DLEP 
Destinations or Gateway Nodes).

Given that use of LID requires a spec and implementation change, I'm not 
sure of the value in moving from TID to LID.

Lou


> Henning Rogge
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