BGP Path Selection - eBGP vs iBGP

Hello Group!

I have what is probably a fairly simple question, but I am slightly confused
with my BGP Labs.

I have a simple topology.

R1 and R3 are in AS 1 and iBGP Peers

R4 and R5 are in AS 2 and iBGP Peers

R1 and R4 are eBGP Peers

R3 and R5 are eBGP Peers

I have the network 10.0.0.0/16 being advertised by R3

On R5 I recieve the NLRI with two paths. One is eBGP via R3 the other iBGP
via R4... R4 sends the iBGP prefix with a Local Preference of 100 and of
course since it's external R3 doesn't send a Local Preference attribute...
Now since the second method of best path selection is "Highest Local
Preference" why do my routers choose eBGP over iBGP?

Here is the BGP RIB.....

   Network Next Hop Metric LocPrf Weight Path
* i10.0.0.0/16 155.1.45.4 0 100 0 2 i
*> 155.1.0.3 0 2 i

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Received on Tue Feb 16 2010 - 16:27:00 ART