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

Greg Mirsky <gregimirsky@gmail.com> Mon, 17 July 2017 09:06 UTC

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 17 Jul 2017 02:06:01 -0700
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To: Jeffrey Haas <jhaas@pfrc.org>
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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Hi Jeff,
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.

Regards,
Greg

On Mon, Jul 17, 2017 at 2:04 AM, Jeffrey Haas <jhaas@pfrc.org> wrote:

> 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
>

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