Configuring Routers

Oh No! I’ve got to program a router! What do I have to do

Router> Router>enable Router# Router#config t Config t is the place to be! Log on to the router

Name the router! Router(config)#hostname Lab-A Step One Lab-A

Password protect the Privilege Mode Step Two Lab-A(config)#enable secret class enable secret 5 $1$emBK$WxqLahy7YOAf0nifub.hU Results in: PasswordCommands

Configure the Interfaces Step Three Lab-A(config)#interface serial0 Lab-A(config-if)# (Note prompt change)

Address the Interface(S0) Lab-A(config-if)#ip address Ip addressSubnet mask S0= S0

Clock ticks MUST be set between routers on the interface with the serial cable DCE end. Serial0 is where the DCE connects in our lab.

We use Serial0 Lab-A(config-if)#clock rate 56000

Address the next Interface (E0) Lab-A(config-if)#ip address Lab-A(config-if)#interface ethernet0 (This changes to program interface e0) S0= E0= E0 S0

Address the next Interface (e1) Lab-A(config-if)#ip address Lab-A(config-if)#interface ethernet1 (This changes to program interface e1) S0= E0= E1= S1=No address E1 S0 E0

Control z Lab-A# Lab-A#show running-config

Results: version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname Lab-A ! enable secret 5 $1$emBK$WxqLahy7YOAf0nifub.hU. ! ip subnet-zero --More--

interface Ethernet0 ip address no ip directed-broadcast shutdown ! interface Ethernet1 ip address no ip directed-broadcast shutdown --More--

interface Serial0 ip address no ip directed-broadcast no ip mroute-cache clockrate shutdown ! interface Serial1 no ip address no ip directed-broadcast shutdown

Like people, routers have to talk to one another!

Step Four Set up routing protocols

Routing Protocols: RIPRIPv2 IGRPEIGRP OSPF

Set up the routing protocol Lab-A(config)#router rip Lab-A(config-router)# version 2 Lab-A(config-router)#network Lab-A(config-router)#network Lab-A(config-router)#network (Note prompt change)

Note! You have to configure for EACH network (remember network # is the “wire” #) Each network is on a separate line Hit Control z to activate and return to: Lab-A#

Lab-A#show run ! router rip version 2 network network network ! (router portion of show run)

Control Access Control and secure access from: CONSOLE VTY (telnet) AUX (modem)

Control Access Step Five Lab-A(config)#line console 0 Lab-A(config-line)#password cisco (Note prompt change) Lab-A(config-line)#login

Continue Lab-A(config)#line vty 0 4 Lab-A(config-line)#password cisco Lab-A(config-line)#login

Control Z (typing the word “exit” at the prompt takes you up one level) Lab-A#show run will give the following results: line con 0 password cisco login transport input none line aux 0 line vty 0 4 password cisco login

Want to save time and move fast between routers? Step Six

A REAL time Saver! Lab-A(config)#ip host Lab-A Lab-A(config)#ip host Lab-B Lab-A(config)#ip host Lab-C Lab-A(config)#ip host Lab-D Lab-A(config)#ip host Lab-E Lab-A(config)#control z

Turn on the interfaces: Lab-A(config)#interface s0 Lab-A(config-if)#no shutdown Lab-A(config-if)#interface e0 Lab-A(config-if)#no shutdown Lab-A(config-if)#interface e1 Lab-A(config-if)#no shutdown Step Seven

For Lab-A router, you are through!

Program the other routers the same way, BUT: Use the interfaces in use on each particular router Use the correct ip address/network address for each port on that router Check and save your configuration! Router#show run (Check) Router#copy run start (S ave)

Let’s Review: Step 1 – name router Hostname xxxxx Step 2 – set “privilege” password and encode it Enable secret xxxxx Step 3 – configure interfaces Interface sX (or eX)

Step 4 – Set the routing protocols Router rip Step 5 – Set who and where access comes from Line console (vty) Step 6 – Save Time Ip host xxx.xxx.xxx yyy.yyy.yyy Step 7 – Turn on interfaces Router(config-if)#no shutdown

Check and Save your work! Check your config Router#show run Save your configuration from RAM to NVRAM Router#copy run start

You’re Through! By Jim Roe