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Re: Draft agenda posted for IETF 105

"Carlos Pignataro (cpignata)" <cpignata@cisco.com> Mon, 22 July 2019 13:44 UTC

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From: "Carlos Pignataro (cpignata)" <cpignata@cisco.com>
To: Jeff Haas <jhaas@pfrc.org>
CC: "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Subject: Re: Draft agenda posted for IETF 105
Thread-Topic: Draft agenda posted for IETF 105
Thread-Index: AQHVPYN26wwRhvG50UKWzUp1yAFk/abWrDgA
Date: Mon, 22 Jul 2019 13:44:46 +0000
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References: <20190718161241.GE21401@pfrc.org>
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Jeff, Reshad,

> On Jul 18, 2019, at 12:12 PM, Jeffrey Haas <jhaas@pfrc.org> wrote:
> 
> Working Group,
> 
> Here's the draft agenda for IETF 105.
> 
> https://datatracker.ietf.org/meeting/105/materials/agenda-105-bfd
> 
> Please note we are reserving the end of the session for discussion about BFD
> v2.  We are using Greg's presentation as a seed item for that discussion.

To further seed and guide this discussion, it would be useful and productive to start with the problems intended to be solved with BFD v2.

For example, that draft used as a seed says in its Abstract:

   This document describes a mechanism to extend the capabilities of
   Bidirectional Forwarding Detection (BFD).  These extensions enable
   BFD to measure performance metrics like packet loss and packet delay.
   Also, a method to perform lightweight on-demand authentication is
   defined in this specification.


Is performance metrics like packet loss and packet delay the main goal? Or a new on-demand auth?

If the former, why not shim IOAM to BFD (and to actual data packets as well) instead of refactoring the protocol?

Further, even better, S-BFD seems much (much!) more friendly to this set of uses than BFD. Why not start with S-BFD which has implementation?

Maybe this starts the discussion early, but starting with this proposed solution confused me.

We could add TLVs. But starting with the problem statement will enable us to think holistically on universe of potential solutions.


A second topic after the Intention and Goals, would be Charter. How does design Perf Mgmt intersect with other WGs?

The BFD current charter says https://datatracker.ietf.org/wg/bfd/about/:

    Important characteristics of BFD include:

    - Simple, fixed-field encoding to facilitate implementations in 
    hardware.


Regarding: https://datatracker.ietf.org/doc/draft-mirmin-bfd-extended/

Can we please add an “Implementation Status” section as it has always guided the BFD WG?


> 
> Our request is if you are aware of individuals interested in general OAM
> techologies in other IETF contexts that you please invite them to this BFD
> session.

Apologies I will not be in Montreal but can follow offline and remote.

Thanks,

Carlos.

> 
> -- Jeff & Reshad
>

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