Re: [mpls] Rtgdir early review of draft-ietf-mpls-bfd-directed-07

Jeffrey Haas <jhaas@pfrc.org> Mon, 17 July 2017 09:13 UTC

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Date: Mon, 17 Jul 2017 05:23:32 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: Greg Mirsky <gregimirsky@gmail.com>
Cc: Carlos Pignataro <cpignata@cisco.com>, rtg-dir@ietf.org, "mpls@ietf.org" <mpls@ietf.org>, draft-ietf-mpls-bfd-directed.all@ietf.org, bfd-chairs@ietf.org
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Subject: Re: [mpls] Rtgdir early review of draft-ietf-mpls-bfd-directed-07
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On Mon, Jul 17, 2017 at 02:06:01AM -0700, Greg Mirsky wrote:
> true, the RFC 5884 does not discuss handling of subsequent LSP Ping with
> the same BFD Discriminator value in BFD Discriminator TLV. My reference to
> RFC 5884 is to point that the default, implied path for the reverse
> direction of the BFD session is over IP network and that how this draft
> interprets BFD Reverse Path TLV with none- sub-TLVs included. And yes,
> nodes that would support this draft MUST handle subsequent LSP Ping Echo
> Request with BFD Discriminator and BFD Reverse TLVs.
> 

I don't believe the procedure updating 5884 to change existing session
properties is called out in the -directed document.  I don't have a strong
opinion about the use case of whether such updates are desired or not.
That's a decision for the MPLS WG.  However, I do think such procedure needs
to be clear if it's desired.  This is part of Carlos' point.

-- Jeff