Re: [Idr] [spring] I-D Action: draft-ietf-idr-performance-routing-02.txt

"UTTARO, JAMES" <ju1738@att.com> Wed, 16 October 2019 11:59 UTC

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From: "UTTARO, JAMES" <ju1738@att.com>
To: Ondrej Zajicek <santiago@crfreenet.org>, "徐小虎(义先)" <xiaohu.xxh@alibaba-inc.com>
CC: idr <idr@ietf.org>, SPRING WG List <spring@ietf.org>
Thread-Topic: [spring] [Idr] I-D Action: draft-ietf-idr-performance-routing-02.txt
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Date: Wed, 16 Oct 2019 11:59:02 +0000
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Subject: Re: [Idr] [spring] I-D Action: draft-ietf-idr-performance-routing-02.txt
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At the time the notion was that one could define addl TLVs to suit one's routing design.. The use case I had and still do in mind is a BGP 3107 topology to carry NHs across a set of stripped IGPs, this seems to deviate from that model.

Thanks,
	Jim Uttaro

-----Original Message-----
From: spring <spring-bounces@ietf.org> On Behalf Of Ondrej Zajicek
Sent: Wednesday, October 16, 2019 5:37 AM
To: 徐小虎(义先) <xiaohu.xxh@alibaba-inc.com>
Cc: idr <idr@ietf.org>; SPRING WG List <spring@ietf.org>
Subject: Re: [spring] [Idr] I-D Action: draft-ietf-idr-performance-routing-02.txt

Hi

My main objection to the draft is it uses separate SAFI to signal that
latency based routing is used. I don't think that is a good idea. Latency
based routing is a general concept, which makes sense to use with several
existing SAFIs (at least 1, 4 and 128). Whether or not announce and
use NETWORK_LATENCY TLV should be an independent session property, like
using AIGP TLV or e.g. ADD-PATH extension.

This is an issue that was underspecified in RFC 7311, just kept by
configuration of both sides. Perhaps we need a new capability to specify
which AIGP TLVs (if any) are supposed to be used on the session, so it
can be negotiated automatically like ADD-PATH.

-- 
Ondrej 'Santiago' Zajicek (email: santiago@crfreenet.org)

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