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

"Carlos Pignataro (cpignata)" <cpignata@cisco.com> Tue, 18 July 2017 10:32 UTC

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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>
CC: Greg Mirsky <gregimirsky@gmail.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>, "draft-ietf-mpls-bfd-directed.all@ietf.org" <draft-ietf-mpls-bfd-directed.all@ietf.org>, "bfd-chairs@ietf.org" <bfd-chairs@ietf.org>
Thread-Topic: Rtgdir early review of draft-ietf-mpls-bfd-directed-07
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Date: Tue, 18 Jul 2017 10:32:24 +0000
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Subject: Re: [mpls] Rtgdir early review of draft-ietf-mpls-bfd-directed-07
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> On Jul 17, 2017, at 11:13 AM, Jeffrey Haas <jhaas@pfrc.org>; wrote:
> 
>> 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.

Greg, I cannot find any default behavior specified in RFC 5884. Section 7, paragraphs 6 and 7 talk about and either/or. 

>> And yes,
>> nodes that would support this draft MUST handle subsequent LSP Ping Echo
>> Request with BFD Discriminator and BFD Reverse TLVs.
>> 

This, along with its associated "how" is missing from the draft. 

> 
> 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, indeed. 

> -- Jeff

Thanks!

-- Carlos.