Cisco Systems 78-11741-02 manual IPC-384, Redistribute bgp

Configuring IP Routing Protocol-Independent Features

IP Routing Protocol-Independent Configuration Examples

redistribute bgp 50000

OSPF Routing and Route Redistribution Examples

OSPF typically requires coordination among many internal routers, ABRs, and Autonomous System Boundary Routers (ASBRs). At a minimum, OSPF-based routers can be configured with all default parameter values, with no authentication, and with interfaces assigned to areas. Three types of examples follow:

•The first examples are simple configurations illustrating basic OSPF commands.

•The second example illustrates a configuration for an internal router, ABR, and ASBRs within a single, arbitrarily assigned, OSPF autonomous system.

•The third example illustrates a more complex configuration and the application of various tools available for controlling OSPF-based routing environments.

Basic OSPF Configuration Examples

The following example illustrates a simple OSPF configuration that enables OSPF routing process 9000, attaches Ethernet interface 0 to area 0.0.0.0, and redistributes RIP into OSPF and OSPF into RIP:

interface ethernet 0

ip address 172.16.1.1 255.255.255.0 ip ospf cost 1

!

interface ethernet 1

ip address 172.17.1.1 255.255.255.0

!

router ospf 9000

network 172.16.0.0 0.0.255.255 area 0.0.0.0 redistribute rip metric 1 subnets

!

router rip network 172.17.0.0 redistribute ospf 9000 default-metric 1

The following example illustrates the assignment of four area IDs to four IP address ranges. In the example, OSPF routing process 1 is initialized, and four OSPF areas are defined: 10.9.50.0, 2, 3, and 0. Areas 10.9.50.0, 2, and 3 mask specific address ranges, whereas area 0 enables OSPF for all other networks.

router ospf 1

network 172.16.20.0 0.0.0.255 area 10.9.50.0 network 172.16.0.0 0.0.255.255 area 2 network 172.17.10.0 0.0.0.255 area 3 network 0.0.0.0 255.255.255.255 area 0

!

!Ethernet interface 0 is in area 10.9.50.0: interface ethernet 0

ip address 172.16.20.5 255.255.255.0

!Ethernet interface 1 is in area 2: interface ethernet 1

ip address 172.16.1.5 255.255.255.0

!Ethernet interface 2 is in area 2: interface ethernet 2

ip address 172.17.2.5 255.255.255.0

Cisco IOS IP Configuration Guide

IPC-384