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Re: [Idr] 2 Week WG Adoption call for draft-ymbk-idr-rs-bfd-00 (3/2/2015 to 3/16/2015)

David Freedman <david.freedman@uk.clara.net> Tue, 17 March 2015 13:53 UTC

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From: David Freedman <david.freedman@uk.clara.net>
To: Randy Bush <randy@psg.com>, Jeffrey Haas <jhaas@pfrc.org>
Thread-Topic: [Idr] 2 Week WG Adoption call for draft-ymbk-idr-rs-bfd-00 (3/2/2015 to 3/16/2015)
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Date: Tue, 17 Mar 2015 13:51:26 +0000
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References: <7BDA4F61-AF6C-4B56-AFC8-D5CC2B9E7A96@cisco.com> <20150316170441.GB23077@pfrc> <m2r3snj4hg.wl%randy@psg.com>
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Subject: Re: [Idr] 2 Week WG Adoption call for draft-ymbk-idr-rs-bfd-00 (3/2/2015 to 3/16/2015)
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On 17/03/2015 10:35, "Randy Bush" <randy@psg.com> wrote:

>> - Autodiscovery of the endpoint for BFD just by gleaning the nexthops.
>
>in reality, often A receives some paths from B but B does not send any
>paths to A.  so you will need a bit more for A to 'discover' the next
>hop.

That's actually covered in the draft, when the BFD session transitions to
up (nod to Jeff here)
we set a diagnostic flag explaining that we did this because we saw some
routes (from the RS)
with next hop of the remote system. The session is established between
systems A and B when
either A has routes for B, or B has routes for A. The session stays until
both sides agree
they are not receiving routes destined for either party, at which point it
is pruned. 

Dave.

>
>randy

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