Configuring Basic Ospf Parameters; Configuring Ospf Interfaces - Cisco Catalyst 3750-E Software Configuration Manual

Configuring OSPF

Configuring Basic OSPF Parameters

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.
Beginning in privileged EXEC mode, follow these steps to enable OSPF:
Command
Step 1 configure terminal
Step 2
router ospf process-id
Step 3 nsf
Step 4 network address wildcard-mask area area-id
Step 5
end
Step 6 show ip protocols
Step 7 copy running-config startup-config
To end an OSPF routing process, use the no router ospf process-id global configuration command.
This example shows how to configure an OSPF routing process and assign it a process number of 109:
Switch(config)# router ospf 109
Switch(config-router)# network 131.108.0.0 255.255.255.0 area 24

Configuring OSPF Interfaces

You can use the ip ospf interface configuration commands to modify interface-specific OSPF
parameters. You are not required to modify any of these parameters, but some interface parameters (hello
interval, dead interval, and authentication key) must be consistent across all routers in an attached
network. If you modify these parameters, be sure all routers in the network have compatible values.
The ip ospf interface configuration commands are all optional.
Note
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
40-30
Purpose
Enter global configuration mode.
Enable OSPF routing, and enter router configuration mode. The
process ID is an internally used identification parameter that is
locally assigned and can be any positive integer. Each OSPF
routing process has a unique value.
OSPF for Routed Access supports only one OSPFv2 and
Note
one OSPFv3 instance with a maximum number of 200
dynamically learned routes.
(Optional) Enable NSF operations for OSPF.
Define an interface on which OSPF runs and the area ID for that
interface. You can use the wildcard-mask to use a single
command to define one or more multiple interfaces to be
associated with a specific OSPF area. The area ID can be a
decimal value or an IP address.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 40 Configuring IP Unicast Routing
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