Cisco Systems 78-11741-02 Policy Routing Example, Default Passive Interface Example, IPC-393

Configuring IP Routing Protocol-Independent Features

IP Routing Protocol-Independent Configuration Examples

The passive-interfacerouter configuration command is typically used when the wildcard specification on the network router configuration command configures more interfaces than is desirable. The following configuration causes OSPF to run on all subnets of 172.18.0.0:

interface ethernet 0

ip address 172.18.1.1 255.255.255.0 interface ethernet 1

ip address 172.18.2.1 255.255.255.0 interface ethernet 2

ip address 172.18.3.1 255.255.255.0

!

router ospf 1

network 172.18.0.0 0.0.255.255 area 0

If you do not want OSPF to run on 172.18.3.0, enter the following commands:

router ospf 1

network 172.18.0.0 0.0.255.255 area 0 passive-interface ethernet 2

Default Passive Interface Example

The following example configures the network interfaces, sets all interfaces that are running OSPF as passive, and then enables serial interface 0:

interface Ethernet 0

ip address 172.19.64.38 255.255.255.0 secondary ip address 172.19.232.70 255.255.255.240

no ip directed-broadcast

!

interface Serial 0

ip address 172.24.101.14 255.255.255.252 no ip directed-broadcast

no ip mroute-cache

!

interface TokenRing0

ip address 172.20.10.4 255.255.255.0 no ip directed-broadcast

no ip mroute-cache ring-speed 16

!

router ospf 1 passive-interface default no passive-interface Serial0

network 172.16.10.0 0.0.0.255 area 0 network 172.19.232.0 0.0.0.255 area 4 network 172.24.101.0 0.0.0.255 area 4

Policy Routing Example

The following example provides two sources with equal access to two different service providers. Packets that arrive on asynchronous interface 1 from the source 10.1.1.1 are sent to the router at

172.16.6.6if the router has no explicit route for the destination of the packet. Packets that arrive from the source 172.17.2.2 are sent to the router at 192.168.7.7 if the router has no explicit route for the destination of the packet. All other packets for which the router has no explicit route to the destination are discarded.

access-list 1 permit ip 10.1.1.1 access-list 2 permit ip 172.17.2.2

!

Cisco IOS IP Configuration Guide

IPC-393