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In this section, you will learn how to
configure OSPF on routers within a single area.
To configure OSPF, you must enable OSPF
on the router and configure the router's network addresses and area
information , according to the following steps:
- Enable OSPF on the router using the
following command:
router(config)#
router ospf
process-id
The process ID is a process number on the local router. The
process ID is used to identify multiple OSPF processes on the same
router. The number can be any value between 1 and 65,535. You
do not have to start numbering OSPF processes at 1. Most network
administrators keep the same process ID throughout the entire AS.
It is possible to run multiple OSPF processes on the same router,
but is not recommended because it creates multiple database
instances that add extra overhead to the router.
- Identify IP networks on the router,
using the following command:
router(config-router)#
network
address wildcard-mask area area-id
For each network, you must identify the area to which the network
belongs. The network value can be the network address, subnet, or
the address of the interface. The router knows how to interpret
the address by comparing the address to the wildcard mask. A
wildcard mask is necessary because OSPF supports CIDR and VLSM,
unlike RIPv1 and IGRP. The area argument is needed even when
configuring OSPF in a single area. Again note that more than one
IP network can belong to the same area.
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Interactive
Lab Activity
(Flash,
371 kB) |
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In this lab exercise, you will configure the SanJose1 router for OSPF
in a single area. The Westasman router is already configured for
OSPF.
You will first specify the OSPF process ID and then enter router
configuration mode.
In router configuration mode, you will configure OSPF for specific
networks in area 0.
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