Re: [Idr] draft-dickson-idr-second-best-backup-02

[Uli Bornhauser <ub at cs.uni-bonn.de>]

Hello Brian,

Brian Dickson schrieb:
> Uli Bornhauser wrote:
> > However, right after that you wrote that step c) must remove all 
> > SECOND_BEST paths. Well, from my point of view, this does not fit to 
> > what you wrote above. Can you explain me what you mean at this point?
>
> What that statement is meant for, is an explanation for *why* there is 
> the need to repeat the step if only SECOND_BESTs remain (or to 
> rephrase in the presence of N'th-bests, if no "best" paths remain).
> Which is, that there *must* be a path selected, which was a received 
> "best" path, in order to proceed to the next step, or to terminate the 
> path selection (i.e. because only one path remains, and it is a 
> received "best" path).
>
> Perhaps a better way to word it would be, "must have removed all...".
I guess it would be the best to remove this comment at this point. It 
should also be OK if the SECOND_BEST paths are removed after step d), 
e), or f).
> > I attach an extended example based on your ones where the 
> > announcement of two signaling paths does not work anymore. It would 
> > require that the first, second, and third best is announced. This 
> > example can be extended for each static number of paths which are 
> > announced by your approach. Thus, to avoid oscillation certainly, a 
> > dynamic number of paths must be announceable, for example as 
> > described in the walton-draft.
>
> Thank you, that is a very helpful example. Would it be alright if I 
> use it in the draft?
Yes indeed, the intention of the example was to clarify the problem, 
this also holds in a draft.

Another question for the case that covers n paths: Do you want to 
announce the information on each path whether it is the, best, second 
best, third best, ...?
> Thanks,
>
> Brian
Regards

Uli

--
______________________________________________________________
Uli Bornhauser                University of Bonn
                             Institute of Computer Science IV
Email: ub at cs.uni-bonn.de      Roemerstr. 164
Phone: +49 (228) 73 - 4550    D - 53117 Bonn
Fax:   +49 (228) 73 - 4571    Germany

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