Chapter 4 Internetworking Operating System )IOS) and Security Device Manager (SDM)

Cisco Router Physical Components ROM nvRAM RAM Flash POST, BootP, Mini IOS Startup-Config File Running-Config File Complete IOS

Boot Sequence 1) POST: Power On Self Test 2) Boot Program (BootP) is loaded: a) IOS is loaded - Flash - TFTP - Mini IOS b) Configuration is loaded - nvRAM - TFTP - Setup Mode Dialog

Switching between User and Privileged Modes Router>enable Router# Router#disable Router> Exiting configuration Router>logout OR Router>exit OR Router#exit

Basic Commands Router(config)#hostname CISCO CISCO(config)# Router(config)#banner motd # This is Secure Router! # Router(config)# Global Configuration Mode GCM Router#config t Enter configuration commands, one per line. End with CNTL/Z. Router(config)#

Show Commands Router>show version (Version, no. of interfaces, IOS image name, size of RAM, NVRAM & FLASH) Router>sh flash (IOS no. & name, available & usable size of FLASH) Router#sh run (Configuration in RAM) Router#sh startup (Configuration in NVRAM, size of configuration in NVRAM) Router(config)#do show run

Using Pipes ( | ) Router#show run | ? appendAppend redirected output to URL (URLs supporting append operation only) beginBegin with the line that matches excludeExlude lines that match includeInclude lines that match redirectRedirect output to URL sectionFilter a section of output teeCopy output to URL

Cisco Router Passwords 1- Enable Secret 2- Enable Password 3- Console Password 4- AUX Password 5- Telnet (VTY) Password 1- Enable Secret Router#config t Router(config)#enable secret cisco 2- Enable Password Router(config)#enable password cisco1

3- Console Password Router(config)#line console 0 Router(config-line)#password cisco Router(config-line)#login Router(config-line)#logging synchronous Router(config-line)#exec-timeout 0 0 Router(config-line)#exit 4- Auxiliary Password Router(config)#line aux 0 Router(config-line)#password cisco Router(config-line)#login 5- VTY Password Router(config-line)#line vty 0 4 Router(config-line)#password telnet Router(config-line)#login

Cisco Router Interfaces Fixed InterfacesModular Interfaces f0f1f0/0f0/1f0/0/0 e0e1e0/0 s0s1s0/0s0/1s0/0/0 PortSlot/PortSlot/SubSlot/Port Router(config)#interface interface name Router(config)#interface f0 Router(config-if)#ip address Router(config-if)#no shut Router(config-if)#description Connection to Sales network Router(config)#interface s0 Router(config-if)#clock rate {no. of bps} Router(config-if)#bandwidth {no. of Kb}

Sub Interfaces Router(config)#int f0 Router(config-if)#no ip address Router(config-if)#no shut Router(config-if)#int f0.1 Router(config-subif)#ip add Router(config-subif)#int f0.2 Router(config-subif)#ip add Secondary IP Router(config-if)#ip address secondary

Saving/Deleting Configuration Router#copy run start Router#copy start run Router#erase startup Router#reload

Viewing Additional Information Router#sh history Router#sh terminal Router#terminal history size {1-255} Router#sh controllers interface name Router#sh controllers s0/0/1 Router#sh interface interface name Router#sh interface f1 Router#sh ip interface interface name Router#sh ip interface s0/0 Router#clear counters interface name Router#sh ip interface brief Interface Status Physical LayerD.L Layer (Line Protocol)up administratively downdowndown updown

Securing Passwords Router(config)#service password-encryption ex: Router#config t Router(config)#service password-encryption Router(config)#exit Router#sh run Router#sh startup Router#copy run start Router#config t Router(config)#no service password-encryption Router(config)#exit Router#copy run start Router#sh run

Setting Time and Date Router#clock set 00:00:00 19 feb 2008 Configuring Cisco Router through Internet Explorer Router(config)#ip http server