ibgp/ebgp AD

Hi experts,

It is common knowledge that a routing protocol and platform *should*
prefer internal routes before external routes.
Like, OSPF prefers Intra Area Routes before Inter Area Routes, and
EIGRP prefers Internal (AD 90) before External (AD 170) routes...

So then to my question - *why* does eBGP have a lower AD then iBGP?
(20 vs 200)? As in "why did Cisco design it that way"?

I tried looking it up, but having problems finding my answer. I really
enjoy reading protocol history, and knowing why things were designed
the way they were, it helps me learn...but this one I can't find.

Thx

Atle

Blogs and organic groups at http://www.ccie.net
Received on Sun Jan 23 2011 - 20:59:28 ART