HDLC IP unnumbered with EIGRP

Hello,
I came upon a scenario that I'm not sure how to solve, hopefully someone
can help.

I have three routers connected in a triangle.
(R4)-s0/0/1------s0/0/1-(R5)-s0/0/0------R3---R4

On R4 and R5 I'm trying to setup ip unnumbered address based on a loopback.
The serial interfaces are running hdlc.
I have eigrp enabled on all interface.

Here is the problem.
R4 seems R5 as an eigrp neighbor over s0/0/1, R5 sees the same things, but
they prefer to route to each other using R3 as it has a lower metric.
I know that if I had used PPP encapsulation, then each router would
install a host route to the directly connected interface (s0/0/1), but when
using hdlc that does not happen.

D 167.1.45.5/32 [90/4857856] via 167.1.34.3, 00:12:19, Serial0/0/0
<-R4 uses R3 as the next hop
C 167.1.45.4/32 is directly connected, Loopback45

Does anyone know how to solve this?

Thank you

(by the way this is a modified version of the INE vol 2 lab 14 task 1.7)

Tom

Blogs and organic groups at http://www.ccie.net
Received on Sat Apr 07 2012 - 13:46:44 ART