nanog mailing list archives
Re: where was my white knight....
From: Leo Bicknell <bicknell () ufp org>
Date: Tue, 8 Nov 2011 13:36:01 -0800
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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Current thread:
- Re: where was my white knight...., (continued)
- Re: where was my white knight.... Leo Bicknell (Nov 08)
- Re: where was my white knight.... Randy Bush (Nov 08)
- Re: where was my white knight.... Nick Hilliard (Nov 09)
- Re: where was my white knight.... Christopher Morrow (Nov 08)
- Re: where was my white knight.... Randy Bush (Nov 08)
- Re: where was my white knight.... bmanning (Nov 08)
- Re: where was my white knight.... Matthias Waehlisch (Nov 08)
- Re: where was my white knight.... Randy Bush (Nov 08)
- Re: where was my white knight.... Owen DeLong (Nov 08)
- Message not available
- Re: where was my white knight.... Christopher Morrow (Nov 08)
- Re: where was my white knight.... Leo Bicknell (Nov 08)
- Re: where was my white knight.... Leigh Porter (Nov 08)
- Re: where was my white knight.... Dobbins, Roland (Nov 08)
- Re: where was my white knight.... Christopher Morrow (Nov 08)