interface loopback 1
 ip addr 10.11.12.13 255.255.255.255
key chain oer-key
 key 1
  key-string cisco
ip prefix-list oer-pref seq 10 permit 0.0.0.0/0
oer-map oer-map 10
 match ip address prefix-list oer-pref
oer border
 logging
 local loopback 1
 master 10.11.12.13 key-chain oer-key
 active-probe address source interface loopback 1
oer master
 logging
 border 10.11.12.13 key-chain oer-key
  interface fastEthernet 0/0.101 external
  interface fastEthernet 0/0.102 external
  interface fastEthernet 0/0.105 internal