Examining the Register Configuration

Examining the Register Configuration
The configuration register is a 16-bit register. The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field.

You can change the default configuration register setting with the enabled config-mode config-register command.

Examining the IOS Copy Command
Router#show flash

System flash directory:

File Length Name/status

1 10084696 c2500-js-l_120-3.bin

[10084760 bytes used, 6692456 available, 16777216 total]

16384K bytes of processor board System flash (Read ONLY)

Router#copy tftp flash

Address or name of remote host? 10.1.1.1

Source filename? c2500-js-l_120-3.bin

Accessing tftp://10.1.1.1/c2500-js-l_120-3.bin...

Erase flash befor copying? [Enter]

Erasing the flash filesystem will remove all files! Continue? [Enter]

Erasing device... eeeee(output omitted) ...erased

Erase of flash: complete

Loading c2500-js-l_120-3.bin from 10.1.1.1 (via Ethernet0): !!!!!!!!!!!!!!!!!!!!

(output omitted)

[OK - 10084696/20168704 bytes]

Verifying checksum... OK (0x9AA0)

10084696 bytes copied in 309.108 secs (32636 bytes/sec)

Router#

The following example demonstrates the sequence of commands you would enter to configure various passwords on a router with the following characteristics:

Console password is cisco

Telnet password is cisco

Privileged Mode password is cisco

Secret password is cisco

Router(config)#line console 0

Router(config-line)#login

Router(config-line)#password cisco

Router(config-line)#exit

Router(config)#line vty 0 4

Router(config-line)#login

Router(config-line)#password cisco

Router(config-line)#exit

Router(config)#enable password ccna

Router(config)#enable secret cisco

Router(config)#service password-encryption

interface Command Syntax

router(config)#interface ethernet 1

router(config-if)#ip address 10.1.1.1 255.0.0.0

router(config-if)#no shut

The following example demonstrates the sequence of commands you would enter to configure a serial line on a router with the following characteristics:

•Router interface is serial 0
•Clock Rate is 64000
•Bandwidth is 64 kbits
•Router#configure terminal
•Router(config)# interface serial 0
•Router(config-if)#clock rate 64000
•Router(config-if)#bandwidth 64
•Router(config-if)# exit
•Router(config)# exit
•Router# show interface serial 0
•Serial 0 is up, line protocol is up

•Hardware is HD64570... MTU 1500 bytes, BW 64000 Kbit,...