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Step-by-Step Router Configuration Guide

Learn how to program a router with this comprehensive guide, from setting up passwords and interfaces to configuring routing protocols. Follow the steps and ensure secure access to your network. Save time and move fast between routers!

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Step-by-Step Router Configuration Guide

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  1. Configuring Routers

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

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

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

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

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

  7. Address the Interface(S0) Lab-A(config-if)#ip address 201.100.11.1 255.255.255.0 Ip address Subnet mask S0 S0=201.100.11.1

  8. 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.

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

  10. Address the next Interface (E0) Lab-A(config-if)#interface ethernet0 (This changes to program interface e0) Lab-A(config-if)#ip address 192.5.5.1 255.255.255.0 E0=192.5.5.1 E0 S0 S0=201.100.11.1

  11. Address the next Interface (e1) Lab-A(config-if)#interface ethernet1 (This changes to program interface e1) Lab-A(config-if)#ip address 205.7.5.1 255.255.255.0 E0=192.5.5.1 E0 S1=No address E1 S0 S0=201.100.11.1 E1=205.7.5.1

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

  13. 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--

  14. interface Ethernet0 ip address 192.5.5.1 255.255.255.0 no ip directed-broadcast shutdown ! interface Ethernet1 ip address 205.7.5.1 255.255.255.0 no ip directed-broadcast shutdown --More--

  15. interface Serial0 ip address 201.100.11.1 255.255.255.0 no ip directed-broadcast no ip mroute-cache clockrate 56000 shutdown ! interface Serial1 no ip address no ip directed-broadcast shutdown

  16. Like people, routers have to talk to one another!

  17. Like people, routers have to talk to one another! Step Four Set up routing protocols

  18. Routing Protocols: RIP RIPv2 IGRP EIGRP OSPF

  19. Set up the routing protocol Lab-A(config)#router rip Lab-A(config-router)# version 2 Lab-A(config-router)#network 192.5.5.0 Lab-A(config-router)#network 207.7.5.0 Lab-A(config-router)#network 201.100.11.0 (Note prompt change)

  20. 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#

  21. Lab-A#show run (router portion of show run) ! router rip version 2 network 192.5.5.0 network 201.100.11.0 network 205.7.5.0 !

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

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

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

  25. 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

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

  27. A REAL time Saver! Lab-A(config)#ip host Lab-A 192.5.5.1 205.7.5.1 201.100.11.1 Lab-A(config)#ip host Lab-B 219.17.100.1 199.6.13.1 201.100.11.2 Lab-A(config)#ip host Lab-C 223.8.151.1 204.204.7.1 199.6.13.2 Lab-A(config)#ip host Lab-D 210.93.105.1 204.204.7.2 Lab-A(config)#ip host Lab-E 210.93.105.2 Lab-A(config)#control z

  28. Turn on the interfaces: Step Seven • 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

  29. For Lab-A router, you are through!

  30. 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 (Save)

  31. 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)

  32. 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

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

  34. You’re Through! By Jim Roe

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