Cisco Systems 78-11741-02 manual Changing Ospf Administrative Distance Example, IPC-252

Configuring OSPF

OSPF Configuration Examples

route-map 1 permit match tag 3

set metric 5

!

route-map 1 deny match tag 4

!

route map 1 permit match tag 5

set metric 5

In the following configuration, a RIP learned route for network 160.89.0.0 and an ISO-IGRP learned route with prefix 49.0001.0002 will be redistributed into an IS-IS Level 2 LSP with a metric of 5:

router isis

redistribute rip route-map 1 redistribute iso-igrp remote route-map 1

!

route-map 1 permit match ip address 1 match clns address 2 set metric 5

set level level-2

!

access-list 1 permit 160.89.0.0 0.0.255.255 clns filter-set 2 permit 49.0001.0002...

The following configuration example illustrates how a route map is referenced by the default-informationrouter configuration command. This type of reference is called conditional default origination. OSPF will originate the default route (network 0.0.0.0) with a type 2 metric of 5 if 140.222.0.0 is in the routing table.

Note Only routes external to the OSPF process can be used for tracking, such as non-OSPF routes or OSPF routes from a separate OSPF process.

route-map ospf-default permit match ip address 1

set metric 5

set metric-type type-2

!

access-list 1 permit 140.222.0.0 0.0.255.255

!

router ospf 109

default-information originate route-map ospf-default

Changing OSPF Administrative Distance Example

The following configuration changes the external distance to 200, making it less trustworthy. Figure 44 illustrates the example.

Cisco IOS IP Configuration Guide

IPC-252