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

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 <[email protected]> On Behalf Of Ondrej Zajicek
Sent: Wednesday, October 16, 2019 5:37 AM
To: 徐小虎(义先) <[email protected]>
Cc: idr <[email protected]>; SPRING WG List <[email protected]>
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: [email protected])

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