Re: where was my white knight....

[Leo Bicknell <bicknell () ufp org>]

In a message written on Tue, Nov 08, 2011 at 04:22:48PM -0500, Christopher Morrow wrote:
> I think actually it wouldn't have caused more validation requests, the
> routers have (in some form of the plan) a cache from their local
> cache, they use this for origin validation... there's not a
> requirement to refresh up the entire chain. (I think).

I kinda think everyone is wrong here, but Chris is closer to accurate.
:P

When a router goes boom, the rest of the routers recalculate around
it.  Generally speaking all of the routers will have already had a
route with the same origin, and thus have hopefully cached a lookup
of the origin.  However, that lookup might have been done
days/weeks/months ago, in a stable network.

While I'm not familar with the nitty gritty details here, caches
expire for various reasons.  The mere act of the route changing
paths, if it moved to a device with a stale cache, would trigger a
new lookup, right?

Basically I would expect any routing change to generate a set of
new lookups proportial to the cache expiration rules.

What am I missing?

-- 
       Leo Bicknell - bicknell () ufp org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/

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