Re: [Idr] Progressing draft-bhatia-bgp-multiple-next-hops-01.txt

[Enke Chen <enkechen at cisco.com>]

John G. Scudder wrote:

> [snip]
>
> > How does B announce these routes forward to D?
> >
> > It has to generate and manage unique path IDs which now, are neither 
> > based
> > on router IDs nor derived from AS numbers, etc. Something that the draft
> > conveniently prefers to skim over.
>
>
> Actually, something that the draft deliberately chooses to remain 
> silent on because we didn't care to over-specify.


Exactly, as it is trivial and implementation specific.

> I'm dumbfounded that so many people seem to believe that associating a 
> unique identifier with a datum is a hard problem. I guess if we 
> resurrect add-path, we could add an appendix with a sample algorithm, 
> or we can just provide a reference to a standard algorithms textbook.


Let us give a trivial algorithm:

For a prefix, allocate the path identifiers for paths sequentially 
starting from 0, do not reuse until it wraps (that will take many many 
years).

-- Enke


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