Hi, 

I face this problem when reading Halabi's classic (p.377-382).  I also face such a 
problem in my supported network.

Router A and B run iBGP in AS1.  A runs eBGP with C in AS2.  B runs eBGP with D in AS3.
I want the A-C path be the primary default and the B-D path be the backup default.
(Note this is not exactly the same as Halabi's example)

In Halabi's example, he uses a default route pointing to a network (e.g. ip route 
0.0.0.0 0.0.0.0 193.78.0.0).  Then he uses route-map to set different local_preference 
based on matching the subnet ip.  The point is this subnet must be advertised inbound 
from the ISP so that we can apply inbound route-map.

 But my problem is that in reality we usually use static default route pointing to the 
ISP's router interface (e.g. ip route 0.0.0.0 0.0.0.0 193.78.1.1).  This route is 
statically entered but not learnt dynamically.  Then how can I set local_pref to this 
default route ?  How can I advertise this route message to the iBGP peer ?  I have 
thought of redistributing static route but it doesn't really make sense and seems too 
complex.

I believe you may also have experienced such a setup.  What's the more practical 
solution ?  Thank you in advance.


Cheers,
YY

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