RE: draft-ietf-bfd-large-packets-02

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Tue, 05 November 2019 05:55 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Jeffrey Haas <jhaas@pfrc.org>, "rtg-bfd@ietf.org" <rtg-bfd@ietf.org>
Subject: RE: draft-ietf-bfd-large-packets-02
Thread-Topic: draft-ietf-bfd-large-packets-02
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Date: Tue, 5 Nov 2019 05:55:04 +0000
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References: <20191101155244.GA30539@pfrc.org>
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Jeff/Albert -

Thanx for the updated version. This addresses my concerns.

A couple of modest comments.

1)Section 3.4

s/that balacing/that balancing


2)Regarding S-BFD (Section 3.5)

It would seem difficult to support (for a given discriminator) some sessions using large packets and some not. I  can think of a few options:

a)Passive end uses large packets only if the Active end does. This assumes MTU is the same in both directions.
b)A separate discriminator is used for large packet sessions
c)Use of large packets is always on (or always off) on the passive side

Probably there are other choices.

What did you have in mind? I think adding some guidance in that regard might be useful.

   Les


> -----Original Message-----
> From: Rtg-bfd <rtg-bfd-bounces@ietf.org>; On Behalf Of Jeffrey Haas
> Sent: Friday, November 01, 2019 8:53 AM
> To: rtg-bfd@ietf.org
> Subject: draft-ietf-bfd-large-packets-02
> 
> Working Group,
> 
> This version attempts to roll up all discussion points to date.  Your
> further review is appreciated.
> 
> -- Jeff and Albert
> 
> ----- Forwarded message from internet-drafts@ietf.org -----
> 
> Date: Fri, 01 Nov 2019 08:46:00 -0700
> From: internet-drafts@ietf.org
> To: i-d-announce@ietf.org
> Cc: rtg-bfd@ietf.org
> Subject: I-D Action: draft-ietf-bfd-large-packets-02.txt
> 
> 
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Bidirectional Forwarding Detection WG of the
> IETF.
> 
>         Title           : BFD Encapsulated in Large Packets
>         Authors         : Jeffrey Haas
>                           Albert Fu
> 	Filename        : draft-ietf-bfd-large-packets-02.txt
> 	Pages           : 7
> 	Date            : 2019-11-01
> 
> Abstract:
>    The Bidirectional Forwarding Detection (BFD) protocol is commonly
>    used to verify connectivity between two systems.  BFD packets are
>    typically very small.  It is desirable in some circumstances to know
>    that not only is the path between two systems reachable, but also
>    that it is capable of carrying a payload of a particular size.  This
>    document discusses thoughts on how to implement such a mechanism
>    using BFD in Asynchronous mode.
> 
> 
> 
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-bfd-large-packets/
> 
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-bfd-large-packets-02
> https://datatracker.ietf.org/doc/html/draft-ietf-bfd-large-packets-02
> 
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-bfd-large-packets-02
> 
> 
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
> 
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
> 
> ----- End forwarded message -----