L2 introduction to router

Router user interface • The Cisco IOS software uses a command-line interface CLI as the traditional console environment... • Each configuration mode is indicated with a distinctive prom

Introduction to Router

• Function and operation of IOS

• Establishing session and log into router

• CLI help features

Operating Cisco IOS Software

Purpose of Cisco IOS Software

• Basic routing and switching functions

• Reliable and secure access to networked

resources

• Network scalability

Router user interface

• The Cisco IOS software uses a command-line interface (CLI) as the traditional console

environment

• This environment is accessible through several

methods:

– Console

– AUX

– Telnet

Router user interface modes

• The Cisco (CLI) uses a hierarchical structure

• Each configuration mode is indicated with a distinctive prompt and allows only commands that are appropriate for that mode The IOS provides a command interpreter service known as the command executive (EXEC)

User EXEC and Privileged EXEC

• The user EXEC mode

allows only a limited

number of basic

monitoring commands

This is often referred to

as a “view only” mode

• The privileged EXEC

mode accesses all router

commands This mode

can be configured to

require a password from

the user before accessing

it

Operating Environment

• The ROM monitor performs the bootstrap process

and provides low-level functionality and

diagnostics It is used to recover from system

failures and to recover a lost password

• Boot ROM mode use a limited subset of the Cisco

IOS feature set, is used primarily to replace Cisco IOS image that is stored in flash

Check for IOS

• To see the IOS image and version that is

running, use the show version command, which also indicates other system settings

• The show flash command is used to verify that the system has sufficient memory to load a new Cisco IOS image

Command: show version

ROM: System Bootstrap, Version 11.0(10c), SOFTWARE

BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version

11.0(10c), RELEASE SOFTWARE (fc1)

LAB_A uptime is 0 minutes

System restarted by reload

System image file is " flash:c1700-ny-mz.122-13.T8.bin ", booted via flash– file he dh, c1700 seri

cisco 2500 (68030) processor (revision N) with 6144K/2048K bytes

of memory Processor board ID 09218746, with hardware revision 00000000

Bridging software.

X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

32K bytes of non-volatile configuration memory.

8192K bytes of processor board System flash (Read ONLY)

Configuration register is 0x2102 thanh gh cau hinh

Boot rom khoi dong- hd bt

Thay doi thi hoat dong thi khac

Command: show flash

System flash directory:

File Length Name/status

1 5895768 c1700-ny-mz.122-13.T8.bin [5895832 bytes used, 2492776 available, 8388608 total] 8192K bytes of processor board System flash (Read ONLY)

Starting a Router

Router Startup Sequence –ntac HD

Setup Mode

• Setup is not intended as the mode for entering

complex protocol features in the router

• Setup mode is to install a minimal configuration for a router, unable to locate a configuration

from another source.

• Setup mode is called when there is no

configuration file at startup or when user issue

setup command

Setup Mode

• At startup, if you see the question “ Would you like to enter the initial configuration dialog ?”, answer no

• Jump out of setup mode without saving by pressing Ctrl+C

Logging into the router

• A user must login to the router before any other commands are entered

User Mode

Privileged Mode

Config Mode

Interface config

Line config

Router config

Dac quyen

Keyboard help in the router CLI

• Typing a question mark ( ? ) displays a handy list

of available commands

• The " More " prompt at the bottom of the

display indicates that multiple screens are

available as output Press the Spacebar to view the next page, or Enter key to view the next line.

• The dollar sign ( $ ) indicates that the line has

been scrolled to the left

• Purpose and operation of IOS

• IOS naming convention

• CLI: use EXEC and privileged EXEC mode

• CLI help and editing command

• Show version