IE Lab 6 conditional default route advertisement

From: Mike Flanagan (mikenoc@mindspring.com)
Date: Wed Dec 07 2005 - 14:06:33 GMT-3


  In this section for injecting a default route you only do it if
your route-map matches the networks in question. Like for instance as
long as I have a route to 192.10.1.0/24 advertise the default route.
Well what if I wanted to advertise the default route if I lost a
route in my route table ? Like for instance lets say if I lost my
connection to BB2 would I use

router ospf 1
  default-information originate always route-map CONDITION

ip prefix-list BB2 seq 5 permit 192.10.1.0/24

ip prefix-list BB3 seq 5 permit 204.12.1.0/24

route-map CONDITION deny 10
  match ip address prefix-list BB2

rute-map CONDITION deny 20
  match ip address prefix-list BB3

  I think with this I would only advertise the default route if I
lose either route in my route table is this correct ?

  Also with this solution would I only advertise the default route if
I lose both connections at the same time ?

router ospf 1
  default-information originate always route-map CONDITION

ip prefix-list BB2 seq 5 permit 192.10.1.0/24
ip prefix-list BB2 seq 5 permit 204.12.1.0/24

route-map CONDITION deny 10
  match ip address prefix-list BB2



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