[c-nsp] Late night BGP puzzler

Gert Doering gert at greenie.muc.de
Thu Aug 2 12:23:25 EDT 2007


Hi,

On Thu, Aug 02, 2007 at 08:38:36AM -0700, Peter Kranz wrote:
> Unfortunately, MED comes too late in the process for this example (equal as
> path length routes from 2 different AS#, one IGP and one EGP).. The only
> option is local_pref (or weight, but that could lead to trouble)
> 
> Step 5: Prefer the path with the lowest origin type.
> Note: IGP is lower than Exterior Gateway Protocol (EGP), and EGP is lower
> than INCOMPLETE.

iBGP vs. eBGP is *not* IGP vs. EGP.  Different thing.

Normally you'll only very rarely see paths with different origin settings
for the same prefix (because it usually only happens if people do weird
things to their routers).

gert

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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de


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