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Re: WG Adoption request for draft-mirsky-bfd-mpls-demand

"Reshad Rahman (rrahman)" <rrahman@cisco.com> Tue, 19 February 2019 03:53 UTC

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From: "Reshad Rahman (rrahman)" <rrahman@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Jeffrey Haas <jhaas@pfrc.org>
CC: Martin Vigoureux <martin.vigoureux@nokia.com>, rtg-bfd WG <rtg-bfd@ietf.org>
Subject: Re: WG Adoption request for draft-mirsky-bfd-mpls-demand
Thread-Topic: WG Adoption request for draft-mirsky-bfd-mpls-demand
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Date: Tue, 19 Feb 2019 03:52:58 +0000
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Hi Greg,

So the text below is for what you had mentioned in a previous email: “The draft proposes to update RFC 5880 in regard to the behavior of BFD system in Demand mode so that such system MAY start Poll sequence to inform the remote BFD system of the change in BFD session state, i.e. signal RDI.” But isn’t that already covered in section 6.6<https://tools.ietf.org/html/rfc5880#section-6.6> of 5880?


   If Demand mode is active on either or both systems, a Poll Sequence

   MUST be initiated whenever the contents of the next BFD Control

   packet to be sent would be different than the contents of the

   previous packet, with the exception of the Poll (P) and Final (F)

   bits.  This ensures that parameter changes are transmitted to the

   remote system and that the remote system acknowledges these changes.

Regards,
Reshad (no hat).

From: Greg Mirsky <gregimirsky@gmail.com>
Date: Monday, February 18, 2019 at 1:03 PM
To: Jeffrey Haas <jhaas@pfrc.org>
Cc: "Reshad Rahman (rrahman)" <rrahman@cisco.com>, Martin Vigoureux <martin.vigoureux@nokia.com>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Subject: Re: WG Adoption request for draft-mirsky-bfd-mpls-demand

Hi Jeff,
here's the text from the draft that describes the behavior on the BFD system:
   If the Detection timer at the egress LER expires it MUST send BFD
   Control packet to the ingress LER with the Poll (P) bit set, Status
   (Sta) field set to Down value, and the Diagnostic (Diag) field set to
   Control Detection Time Expired value.  The egress LER sends these
   Control packets to the ingress LER at the rate of one per second
   until either it receives the valid for this BFD session control
   packet with the Final (F) bit set from the ingress LER or the defect
   condition clears and the BFD session state reaches Up state at the
   egress LER.

Regards,
Greg

On Mon, Feb 18, 2019 at 9:34 AM Jeffrey Haas <jhaas@pfrc.org<mailto:jhaas@pfrc.org>> wrote:
On Mon, Feb 18, 2019 at 08:48:08AM -0800, Greg Mirsky wrote:
> As for your question of what is the change proposed in the draft I'll point
> to section 6.6 RFC 5880 that describes the Demand mode. It states that the
> periodic transmission of control messages MUST be stopped.

Correct.

> The draft
> defines, and that is what I consider the update to section 6.6, the
> procedure by which the system in Demand mode initiates the Poll sequence to
> inform the remote BFD system of RDI.

Would you clarify where in your draft this is discussed?

> Greg

-- Jeff

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