Cisco Systems 78-11741-02 manual Enabling Ospf, Configuring Ospf Interface Parameters, IPC-225

Configuring OSPF

Enabling OSPF

Enabling OSPF

As with other routing protocols, enabling OSPF requires that you create an OSPF routing process, specify the range of IP addresses to be associated with the routing process, and assign area IDs to be associated with that range of IP addresses. To do so, use the following commands beginning in global configuration mode:

	Command	Purpose
Step 1
	Router(config)# router ospf process-id	Enables OSPF routing, which places you in router
		configuration mode.
Step 2
	Router(config-router)# network ip-address	Defines an interface on which OSPF runs and define
	wildcard-mask area area-id	the area ID for that interface.

Configuring OSPF Interface Parameters

Our OSPF implementation allows you to alter certain interface-specific OSPF parameters, as needed. You are not required to alter any of these parameters, but some interface parameters must be consistent across all routers in an attached network. Those parameters are controlled by the ip ospf hello-interval, ip ospf dead-interval, and ip ospf authentication-keyinterface configuration commands. Therefore, be sure that if you do configure any of these parameters, the configurations for all routers on your network have compatible values.

To specify interface parameters for your network, use the following commands in interface configuration mode, as needed:

Command	Purpose
Router(config-if)# ip ospf cost cost	Explicitly specifies the cost of sending a packet on an OSPF
	interface.
Router(config-if)#ip ospf retransmit-interval	Specifies the number of seconds between link-state advertisement
seconds	(LSA) retransmissions for adjacencies belonging to an OSPF
	interface.
Router(config-if)#ip ospf transmit-delay	Sets the estimated number of seconds required to send a link-state
seconds	update packet on an OSPF interface.
Router(config-if)# ip ospf priority	Sets priority to help determine the OSPF designated router for a
number-value	network.
Router(config-if)#ip ospf hello-interval	Specifies the length of time between the hello packets that the
seconds	Cisco IOS software sends on an OSPF interface.
Router(config-if)#ip ospf dead-interval	Sets the number of seconds that a device must wait before it declares
seconds	a neighbor OSPF router down because it has not received a hello
	packet.
Router(config-if)#ip ospf authentication-key	Assigns a password to be used by neighboring OSPF routers on a
key	network segment that is using the OSPF simple password
	authentication.

Cisco IOS IP Configuration Guide

IPC-225