Open Shortes Path First ( OSPF )

The Open Shortest Path First (OSPF) protocol is the first link-state routing protocol covered in this book. OSPF is a nonproprietary Interior Gateway Protocol (IGP) that overcomes the deficiencies of other distance vector routing protocols. It distributes routing information within a single OSPF routing domain. OSPF introduced the concept of variable-length subnet masking (VLSM), which supports classless routing, summarization, authentication, and external route tagging.

Overview

In this blog, we walk through the creation of a multi-area OSPF lab using Cisco devices, simulating an enterprise-grade environment. This setup is ideal for understanding OSPF design best practices, route summarization, and how loopbacks play a role in OSPF routing tables.

Lab Objectives

1. Use the IP addressing scheme depicted in FIG X.
2. Set telnet access for the router to use the local login permissions of username swsa and
   the password cisco.
3. Configure the enable password to be cisco.
4. Configure IP addressing on all three routers.
5. Configure OSPF areas 0, 1, and 2.
6. Finally, test that the link is up and working by sending a ping across the link.

Lab Walk-Through

R3 – initial configuration

Router#config t
Router(config)#hostname R3
R3(config)#
R3(config)#interface g 0/0
R3(config-if)#ip address 192.168.1.1 255.255.255.252
R3(config-if)#no shutdown
R3(config-if)#interface loopback 0
R3(config-if)#ip address 172.16.1.1 255.255.0.0

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