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

Gert Doering <gert@space.net> Tue, 14 March 2017 08:07 UTC

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Date: Tue, 14 Mar 2017 09:07:32 +0100
From: Gert Doering <gert@space.net>
To: Randy Bush <randy@psg.com>
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References: <148924277112.2960.17904473852401253352@ietfa.amsl.com> <m2k27tzs5k.wl-randy@psg.com> <CA+b+ERmmqtUkJMtfOE9ABFHN0gNdztjOGELmirNgWRnDENrjaA@mail.gmail.com> <m2zigpxu7o.wl-randy@psg.com> <CA+b+ER=MaOqOr0A9VZ3TfgbSWgjk3eGwLKmnfr=byvOs11Ppfg@mail.gmail.com> <m2o9x4whh2.wl-randy@psg.com>
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Cc: Interminable Discussion Room <idr@ietf.org>, Robert Raszuk <robert@raszuk.net>
Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-02.txt
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Hi,

On Tue, Mar 14, 2017 at 02:32:57PM +0900, Randy Bush wrote:
> > ???That not correct if you do it right. If you can reach A via NH1 and NH2
> > and RS propagates both of those NHs to clients - it is up to clients to
> > validate those NHs and choose one which they prefer for forwarding at a
> > given point of time.
> 
> why do folk use RS?  to offload the bgp decision process.

Mmmmh, I'm not sure I agree to that - we use the RS because it saves
us the hassles of maintaining 300+ BGP sessions with lots of small peers,
so "human life time" plus "router CPU" is more a factor.  

Offloading the BGP decision process is a side effect - with sometimes 
undesired results, in which case we add direct sessions to reclaim
control.  But usually, for those 300 smaller peers, "it just gets things
done".

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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