OPEN HYPER TERMINAL OR PUTTY TO TAKE THE CONSOLE OF ROUTER …………………………………….

TYPE ‘NO’ AND ‘RETURN’ TO COME ON USER MODE FROM SETUP MODE

Three Different Ways to Connect to A Cisco Router

Console port
Auxiliary port
Telnet

Console port

Usually a RJ45 connection on the back of the router
It is used to directly connect and configure the
Router no password is set on the console by default

Auxiliary port

It is usually a RJ45 connector on the back of the router.
It is used to connect and configure the router remotely via modem
It must be configured using console port before it can be used
The speed of this port can be set as high as 15200bps on some devices
No password is set by default; password is required to be set.

Telnet

It is an emulation program that emulates a dumb-terminal
Ones telnet session is established we can connect to any active interface (Ethernet or serial) on the router.
Several concurrent telnet connection to a router are allowed

Preparing the router for initial configuration

We need to obey the following guidelines before bringing up a router:

Step 1 Verify the power, cabling and console connection

Step 2 Switches on the power switch

Step 3 Observe the following boot sequence:

Step3.1 POST

Step3.2 Find & load IOS image from flash memory. Router uses it for it’s operating system

Step3.3 Look for a valid configuration called startup-configuration that is stored in NVRAM. This configuration statement give router’s specific attributes, protocol functions and interface addresses.

If there is no configuration in NVRAM, the router will automatically enter to “Setup mode”.

We can also enter in to Setup mode at any time by typing “setup” command at the privileged EXEC mode. (Router # setup)

Setup mode can be either:

Basic

Extended

Given below is the list of some global parameters that can be configured:

Set the router host name
Set various passwords:

i. Set enable secret

ii. Set enable password

iii. Set virtual terminal password

Configure initial protocols e.g. SNMP, LAT, AppleTalk, DECnet, IP, IGRP routing etc.
Configure additional protocols
Configure interface parameters

Finally router shows the new configurations and ask, whether you want to save to NVRAM.

Logging in to the Router

Two types of user interfaces are:

User mode
Privileged mode

Movement from user mode to privileged mode and vice versa is shown below:

Router> (user mode)

Router>enable

Router# (privileged mode)

Router #disable

Router>

Type logout to exit the console

Router>logout

Keyboard help in Router Command –Line Interfaces

Cisco IOS software include following command-line input help facilities:

Context Sensitive Help
Console Error Messages
Command History Buffers

Context Sensitive Help

For word help- Type-?
For command syntax help-Type___? (after space)

Console Error Messages

% Ambiguous command
% Incomplete command
% Invalid input detected at “^” marker

Command History Buffers

Set the command history buffer size
Recall commands
Disable the command history feature.

Command	Functionality
Ctrl+p or up-arrow	Last (previous) command recall
Ctrl+n or down-arrow	More recent command recall
Router>show history	Show command buffer
Router>terminal history size lines	Set command buffer size
Router>no terminal editing	Disable advanced editing
Router>terminal editing	Re-enable advanced editing
<Tab>	Entry Completion

Enhanced Editing Key Commands

Command Line Editing Key Sequence	Description
Ctrl+a	Moves the cursor to the beginning of the line
Ctrl+e	Moves the cursor to the end of the line
Ctrl+f	Moves the cursor forward one character
Ctrl+b	Moves the cursor backward one character
Esc+f	Moves the cursor forward one word
Esc+b	Moves the cursor backward one word
Ctrl+d	Deletes a single character
Ctrl+k	Deletes everything to the right of the line
Ctrl+x	Deletes everything to the left of the line
Ctrl+w	Deletes a word
Ctrl+u	Deletes a line
Ctrl+r	Refreshes the command line and everything typed up to this point
Backspace	Removes one character to the left of the cursor.
Tab	Completes a partially entered command if enough characters have been entered to make it unambiguous

Commands to get basic Router Information

Router #show version

Router #show running-config

Router #show startup-config

Router Configuration commands from CLI

LAB EXERCISE 1

Basic IOS Commands:

User Exec Mode Prompt…

Router>

How to reach Privileged EXEC Mode (Enable Mode)…

Router>enable

Router#

How to reach User EXEC Mode…

Router #disable

Router>

How to reach Global Configuration Mode…

Router #config terminal

Router (config) #

How to reach other configuration mode…

1.Line configuration mode

Router (config) #line <type of line to be configured> <line no.>

Router (config-line) #

2.Interface configuration mode

Router(config)#interface serial 0

Router(config-if) #

Return to previous mode

Type ‘exit’ at any stage

Monitoring the Router

1.Current IOS version

Router #show version

2.Contents of Flash

Router #show flash

3.Contents of RAM

Router #show buffers

Router #show stacks

4.Displaying the startup configuration

Router #show startup-config

5. Displaying the running configuration

Router #show running-config

6.Monitor interface parameters

Router>show <interface type slot no./port no.>

Setting Password:

1.Enable Password

Router(config) #enable secret <cisco>

2.Enable Secret

Router(config) #enable password <shree>

3.Auxiliary Password

Router(config) #line aux 0

Router(config-line) #login

Router(config-line) # password <shree>

5.Console Password

Router(config) #line console 0

Router(config-line) #login

Router(config-line) #password <shree>

6.Other console port Password

Router(config) #line console 0

Router(config-line) #exec-timeout 0 0

Router(config-line) #logging synchronous

7.Telnet Password

Router(config) #line vty 0 197

Router(config-line) #login

Router(config-line) #password <shree>

Router(config-line) #no login

Banner Setting

Router(config) #banner motd <delimiting character><banner string><delimiting character>

e.g.

Router(config) #banner motd #Even Impossible says I M possible.#

Hostname