Re: [DNA] Couple of points on draft-jinchoi-dna-soln-frame-00.txt

[Erik Nordmark <Erik.Nordmark@sun.com>]

>   2.  We assign each link a locally unique Link Identifier.  'Locally
>       unique' means, no two adjacent links have the same Link
>       Identifier.
> 
> This would have issues if the hosts ever make a long jump (skipping some
> intermediate links) for any reason.

Yes, perhaps globally unique (or probabilistically unique is better).

The length of the jump is limited by the lifetime of the information
that is retained. For prefixes RFC 2461 suggests a default lifetime of
30 days. Withing 30 days a host could presumably move to any link on
the planet.

So unless we make the link-ID advertisement in the Router Advertisements
have a small lifetime (a few seconds), then I think "adjancent links"
in this context becomes the whole internet.

Furthermore, physically close links will be operated by different entities
(e.g. the corporate WLAN, the GPRS network covering the same area,
the coffeeshop WLAN downstairs) and a host can quickly move between them.
But the different operators are not likely to coordinate their assignment
of their link IDs.
So this is another argument for needing globally (probabilistically) unique
link-IDs.

  Erik