Re: I-D ACTION:draft-ietf-bfd-generic-00.txt

All -

We have left the 1-hop (w/ IGP examples) and generic draft as agreed at
the last two WG meetings. There is no real benefit (as discussed) to mentioning
each and every app that could bootstrap a BFD session, we would never 
standardize the doc as new ones are creeping up every day. Since the 
base spec and 1-hop are in LC (again as agreed by the WG), I recommend
we don't reopen this can of worms.

more down below. 

On Thu, Jul 21, 2005 at 10:36:48AM +0800, Suping Zhai wrote:
> Hi Carlos,
> I am sympathy with you regarding this generic draft. 
> And more I think that it's better if all the BFD related applications including IGP, BGP, MPLS and static routes can go together into one draft.
> 
> And another note, in this draft section 2, it reads as followings,
>    The service interface with BFD is straightforward.  The application
>    supplies session parameters (neighbor address, time parameters,
>    protocol options), and BFD provides the session state, of which the
>    most interesting transitions are to and from the Up state.  The
>    application is expected to bootstrap the BFD session, as BFD has no
>    discovery mechanism.
> 
> 
> Perhaps, the session paramters of time parameters is the responsiblity of BFD session its self, not supplied by application.

I don't see how this is possible. BFD checks the forwarding plane created
by other applications. Those applications are requesting from BFD the 
fast notification of a failure. Since BFD doesn't setup the forwarding plane,
it should bootstrap itself. 

-DWard

> 
> I dont' what's opinions?
> 
> Regards,
> suping
> >Hi,
> >
> >Reading the generic document, I now have a doubt: shouldn't mentions
> >to OSPF and IS-IS in the 1-hop draft go in a separate "IGP application
> >document" or "OSPF / ISIS application document"? Most of the content
> >is not related to the 1hop functionality but rather with BFD-protocol
> >interactions, including Graceful restart.
> >
> >Or perhaps, as another example in the generic draft?
> >
> >For example, the Graceful restart mentioned in the 1hop draft, is
> >probably applicable to all protocols that have Graceful restart (as
> >BGP), not only to IGPs.
> >
> >I know it is a non negligible amount of editorial work, but will
> >probably lay out a clear structure for the BFD standards... that, with
> >the count already up to more than four drafts for BFD, may be a good
> >thing. (or not, it probably depends).
> >
> >Regards,
> >Carlos.
> >
> >2005/7/16, rtg-bfd-request@ietf.org <rtg-bfd-request@ietf.org>:
> >> Date: Fri, 15 Jul 2005 15:50:02 -0400
> >> From: Internet-Drafts@ietf.org
> >> Subject: I-D ACTION:draft-ietf-bfd-generic-00.txt
> >> To: i-d-announce@ietf.org
> >> Cc: rtg-bfd@ietf.org
> >> Message-ID: <E1DtWCA-0001vE-Uf@newodin.ietf.org>
> >> Content-Type: text/plain; charset="us-ascii"
> >> 
> >> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> >> This draft is a work item of the Bidirectional Forwarding Detection Working Group of the IETF.
> >> 
> >>         Title           : Generic Application of BFD
> >>         Author(s)       : D. Katz, D. Ward
> >>         Filename        : draft-ietf-bfd-generic-00.txt
> >>         Pages           : 7
> >>         Date            : 2005-7-15
> >> 
> >>    This document describes the generic application of the Bidirectional
> >>    Forwarding Detection (BFD) protocol in environments not specifically
> >>    documented in other specifications.  Comments on this draft should be
> >>    directed to rtg-bfd@ietf.org.
> >> 
> >> A URL for this Internet-Draft is:
> >> http://www.ietf.org/internet-drafts/draft-ietf-bfd-generic-00.txt
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