conditional default advertising in BGP with multiple routes to

From: Koen Zeilstra (koen@koenzeilstra.com)
Date: Tue Oct 16 2007 - 06:13:33 ART

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Hi Group,

Please observe the following (I hope) interesting task.

Advertise a default route to a BGP neighbor conditionally. Watch two
routes in your routing table. When both routes are present the default
route should be announced to the neighbor.

I was thinking towards the following direction.

neighbor 10.0.0.1 default-originate route-map checkroutes
!
route-map checkroutes
  match ip address 10
  match ip address 20
!
access-list 10 permit 1.1.1.1
access-list 20 permit 2.2.2.2
!

However this route-map results in:

route-map checkroutes
  match ip addres 10 20
!

Which is an "OR" function afterall and not the "AND" we are looking for.

Any bright ideas on this particular assignment?

thanks in advance,

Koen

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