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

[Suping Zhai <[e-mail]>]

Dear David,
Some clarification inline, please see below.
>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.

Geting together all the applications together is just a idea, perhaps it is difficult to realize:)  No problem.
>
>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. 


First, I mean that the time parameters is negotiated by the BFD session, not supplied by the applicatons.
Second, what does it mean by the last line above---"since BFD doesn't setup the forwarding plane, it should bootstrap ***itself***"???

Suping
>
>-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, [e-mail] <[e-mail]>:
>> >> Date: Fri, 15 Jul 2005 15:50:02 -0400
>> >> From: [e-mail]
>> >> Subject: I-D ACTION:draft-ietf-bfd-generic-00.txt
>> >> To: [e-mail]
>> >> Cc: [e-mail]
>> >> Message-ID: <[e-mail]>
>> >> 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 [e-mail].
>> >> 
>> >> A URL for this Internet-Draft is:
>> >> http://www.ietf.org/internet-drafts/draft-ietf-bfd-generic-00.txt
>> >> 
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