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Learning by Doing: CISCO Certified Network ... - SCN Research

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Open Shortest Path First (OSPF)<br />

Objective:<br />

To learn how to configure a very basic OSPF network with two routers and to learn about<br />

wildcard masks.<br />

Tools and Materials:<br />

(2) PC/workstations<br />

(2) Routers<br />

(2) Switches<br />

(4) Straight-through cables<br />

(1) DCE/DTE serial cable<br />

(2) rollover cables<br />

Lab Diagram:<br />

e0<br />

st<br />

con<br />

s0<br />

s1<br />

con<br />

st<br />

e0<br />

NIC<br />

st ro ro st<br />

COM1<br />

COM1<br />

NIC<br />

Workstation “A”<br />

Workstation “B”<br />

Addressing:<br />

Routers<br />

Hostnames wash leung<br />

E0 172.16.1.1/24 172.16.3.1/24<br />

S0 172.16.2.1/24 (DCE) n/a<br />

S1 n/a 172.16.2.2/24 (DTE)<br />

Workstations A B<br />

IP 172.16.1.2 172.16.3.2/24<br />

SM 255.255.255.0 255.255.255.0<br />

GW 172.16.1.1 172.16.3.1<br />

Background:<br />

OSPF was developed in the late 1980’s as an alternative to the distance vector routing<br />

protocols (RIP, IGRP, etc). OSPF is link-state protocol that uses the Dijstra’s algorithm<br />

(Shortest Path First-SPF). OSPF does what it sounds like: it calculates the shortest route<br />

to a destination, but not necessarily the quickest one. Unlike IGRP and EIGRP the OSPF<br />

protocol is not proprietary to <strong>CISCO</strong> equipment. Unlike IGRP and RIP (version 1) OSPF<br />

can accommodate passing various lengths of subnets with data information<br />

312

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