Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-02.txt

Jeffrey Haas <jhaas@pfrc.org> Tue, 14 March 2017 20:36 UTC

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Date: Tue, 14 Mar 2017 16:42:12 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: Robert Raszuk <robert@raszuk.net>
Cc: Nick Hilliard <nick@foobar.org>, idr wg <idr@ietf.org>
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-02.txt
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Robert,

I'll let the other comments in this thread stand on their merit.  However, I
did want to respond to one specific point here:

On Mon, Mar 13, 2017 at 11:45:25AM +0100, Robert Raszuk wrote:
> I am afraid you have completely missed my point.
> 
> I never said clients must not detect other clients liveness before using it
> for best path selection and in their local data planes.
> 
> I said RS does not need to bothered with that information.

The relevant bit of procedure within this document to run BFD toward an eBGP
nexthop and use it in the local decision process is of potential value even
without the RS SAFI part of the protocol.  So, in this respect, I agree.

The authors had previously discussed extracting this procedure from the
document and are fine with doing so if it makes sense.

The one "common" use case where this may be of benefit outside of a
route-server environment is BGP "VPNs" that are constructed using IPSEC
tunnels with the network effectively an NBMA subnet.  

-- Jeff