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

Jeffrey Haas <jhaas@pfrc.org> Mon, 17 July 2017 08:54 UTC

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Date: Mon, 17 Jul 2017 05:04:00 -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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Greg,


On Wed, Jul 12, 2017 at 07:19:04PM -0700, Greg Mirsky wrote:
> GIM>> I disagree with your conclusion that  the draft does not include
> mechanism to switch the reverse path of the BFD session in Up state.
> Firstly, the BFD Reverse Path TLV MAY be included in LSP Ping at any moment
> in time, not only when bootstrapping BFD session. Secondly, the draft
> states that if BFD Reverse Path TLV contains none sub-TLVs, then the
> reverse path MUST be switched to IP network, which is the default behavior
> per RFC 5884.

I'm not sure I agree with your conclusion.  As best I'm aware,
implementations only bootstrap their sessions to start with lsping.  I don't
recall discussion about procedures for updating existing sessions.  This may
be a fault of my memory - would you clarify where you believe this is
covered in 5884?

-- Jeff