Re: [Idr] WG LC draft-ietf-idr-flowspec-path-redirect-10.txt [11/17/2019 to 12/2/2019]

Robert Raszuk <robert@raszuk.net> Mon, 02 December 2019 18:29 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 2 Dec 2019 19:29:40 +0100
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To: Jeffrey Haas <jhaas@pfrc.org>, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
Cc: "idr@ietf.org" <idr@ietf.org>, Sue Hares <shares@ndzh.com>
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Subject: Re: [Idr] WG LC draft-ietf-idr-flowspec-path-redirect-10.txt [11/17/2019 to 12/2/2019]
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> I suspect in the majority of the cases that path-redirect is intended
> involving segment routing that following a segment path from a VRF context
> doesn't make much sense.  However, some of the cases are left as much more
> abstract and perhaps they could?
>

IMO using flow spec extension to specify a binding SID which in turn will
be replaced by explicit path is a huge mistake this draft is proposing.
Sure text can take everything but the operational complexity to
troubleshoot such network will be a nightmare. And if you would just
specify a single SID why not to specify the IP address and be done ? Router
will reach such IP via proper path.

Please observe that you are now trying to mimic BGP SR Policy propagation
which also includes mapping via color and policy to be used.

What happens when router will receive both in a conflicting manner ?

Btw what practical application is this draft trying to accomplish other
then pretty badly redo subset of BGP SR Policy work ?

Thx,
R/