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Basic Switch configurations commands

In this article I will introduce the Cisco Internetwork Operating System (IOS) command line

interface (CLI) for the 2960 series switch. You will need to logon to a switch and become familiar

with the different levels of access on the switch. You will also become familiar with the

commands available to you in each mode (user or privileged) and the switch help facility, history,

and editing features.

User vs. Privileged ModeUser mode is indicated with the > next to the switch name. You can look at settings but can not

make changes from user mode. In Privilege mode, indicated by the #, you can do anything. To

get into privilege mode the keyword is enable.

HELP

To view all commands available from this mode type:?This will give you the list of all available

commands for the switch in your current mode. You can also use the question mark after you

have started typing a command. For example if you want to use a show command but you donot remember which one it is, use the ? as this will output all commands that you can use with

the show command.

The Best NetFlow Analyzerplixer.com/Scrutinizer

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Cisco Commands

Cisco CCNA 1

Cisco IOS

Switch Cisco Cisco Networking

Linux Commands

CCNA Networking

Virtual Router

Cisco Login
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Switch>?

Exec commands:

[1-99] Session number to resume

connect Open a terminal connection

disconnect Disconnect an existing network

connection

enable Turn on privileged commands

exit Exit from the EXEC

logout Exit from the EXEC

ping Send echo messages

[Output is omitted]

Three command can be used to logout from terminal.

Switch>enable

Switch#disable

Switch>exit

Switch con0 is now available

Press RETURN to get started.

show versionCommand will display the device platform, detected interface, ios name
http://pdfcrowd.com/http://pdfcrowd.com/redirect/?url=http%3a%2f%2fcomputernetworkingnotes.com%2fswitching-vlan-stp-vtp-dtp-ether-channels%2fbasic-switch-configurations.html&id=ma-140815074202-6948258chttp://pdfcrowd.com/customize/http://pdfcrowd.com/html-to-pdf-api/?ref=pdf


4/24


Switch>enable

Switch#show version

Cisco IOS Software, C2960 Software (C2960-LANBASE-M),

Version

12.2(25)FX, RELEASE SOFTWARE (fc1)

Copyright (c) 1986-2005 by Cisco Systems, Inc.

Compiled Wed 12-Oct-05 22:05 by pt_team

ROM: C2960 Boot Loader (C2960-HBOOT-M) Version 12.2(25r)FX,

RELEASE SOFTWARE (fc4)

System returned to ROM by power-on

Cisco WS-C2960-24TT (RC32300) processor (revision C0) with

21039K bytes of memory.

24 FastEthernet/IEEE 802.3 interface(s)

2 Gigabit Ethernet/IEEE 802.3 interface(s)

[Output is omitted]

show mac addressCommand will show all detected mac address dynamically and manually

Switch#show mac-address-table Mac Address Table

-------------------------------------------

Vlan Mac Address Type Ports

---- ----------- -------- -----


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1 0001.643a.5501 DYNAMIC Gig1/1

To view run time configuration of RAM use show running-configcommand

Switch#show running-config

Building configuration...

Current configuration : 925 bytes

version 12.2

no service password-encryption

!

hostname Switch

[Output is omitted]

To view startup configuration [ Stored in NVRAM] use show startup-configcommand

Switch#show startup-config

Current configuration : 925 bytes

version 12.2

no service password-encryption

!

hostname Switch

[Output is omitted]


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To get information about VLAN configuration use show vlancommand

Switch#show vlan

VLAN Name Status Ports

---- -------------------------------- --------- -----------------------

1 default active Fa0/1, Fa0/2,

Fa0/3, Fa0/4

Fa0/5, Fa0/6,

Fa0/7, Fa0/8

Fa0/9, Fa0/10,

Fa0/11, Fa0/12

Fa0/13, Fa0/14,

Fa0/15, Fa0/16

Fa0/17, Fa0/18,

Fa0/19, Fa0/20

Fa0/21, Fa0/22,

Fa0/23, Fa0/24

[Output is omitted]

show interface command will show all detected interface with their hardware description and

configuration

Switch#show interfaces


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FastEthernet0/1 is up, line protocol is up (connected)

Hardware is Lance, address is 0060.2f9d.9101 (bia

0060.2f9d.9101)

MTU 1500 bytes, BW 100000 Kbit, DLY 1000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

[Output is omitted]

interface vlan 1 is used to assign ip address and default gateway to switch. Show interface

vlan 1will give a over view of vlan1.

Switch#show interface vlan1

Vlan1 is administratively down, line protocol is down

Hardware is CPU Interface, address is 0060.5c23.82ae

(bia 0060.5c23.82ae)

MTU 1500 bytes, BW 100000 Kbit, DLY 1000000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

ARP type: ARPA, ARP Timeout 04:00:00

[Output is omitted]

delete command is used to delete all vlan configuration from switch Dont add space between

flash and vlan.dat Run this exactly shown here adding a space could erase flash entirely leaving

switch blank


8/24


Switch#delete flash:vlan.dat

Delete filename [vlan.dat]?

Delete flash:/vlan.dat? [confirm]

%deleting flash:/vlan.dat

Startup configuration can be removed by erase commands

Switch#erase startup-config

Erasing the nvram filesystem will remove all configuration

files!

Continue? [confirm]

[OK]

Erase of nvram: complete%SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvram

Basic Switch Configuration Step by Step

use configure terminalcommand to go in global configuration mode

Switch#configure terminal

Enter configuration commands, one per line. End with

CNTL/Z.

Now change default switch name to switch 1

Switch(config)#hostname Switch1


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Switch1(config-if)#exit

Switch1(config)#ip default-gateway 192.168.0.5

Set a description finance VLANto interface fast Ethernet 1

Switch1(config)#interface fastEthernet 0/1

Switch1(config-if)#description finance VLAN

By default switch automatically negotiate speed and duplex but you can adjust it manually

Switch1(config-if)#duplex full

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state

to down%LINEPROTO-5-UPDOWN: Line protocol on Interface

FastEthernet0/1,

changed state to downSwitch1

(config-if)#duplex auto


to up

Switch1(config-if)#duplex half


to down

%LINEPROTO-5-UPDOWN: Line protocol on Interface

FastEthernet0/1,

changed state to down


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to up

Switch1(config-if)#duplex auto

Switch1(config-if)#speed 10

Switch1(config-if)#speed 100

Switch1(config-if)#speed auto

Switch1(config-if)#exit

Switch1(config)#exit

mac address table can be wiped out by clear commands

Switch1#show

Switch1#show mac-address-table

Mac Address Table

-------------------------------------------

Vlan Mac Address Type Ports

---- ----------- -------- -----

1 0001.643a.5501 DYNAMIC Gig1/1Switch1#clear mac-address-table

Switch1#clear mac-address-table ?

dynamic dynamic entry type

Switch1#clear mac-address-table dynamic

To restart switch use reload command [ running configuration will be erased so copy it first to


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startup configuration ]

Switch1#reload

Proceed with reload? [confirm]

Switch con0 is now available

Press RETURN to get started.

CCNA basic switch configuration commands sheet

Command descriptions

switch>?The ? works here the same as in a router Used to get the

list of all available commands

switch>enable User mode, same as a router

switch# Privileged mode

switch#disable Leaves privileged mode

switch>exit Leaves user mode

switch#show version Displays information about software and hardware.

switch#show flash:Displays information about flash memory (will work only

for the 2900/2950 series).

it h# h dd


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switch#show mac-address-

table

Displays the current MAC address forwarding table

.

switch#show running-

configDisplays the current configuration in DRAM.

switch#show startup-config Displays the current configuration in NVRAM.

switch#show vlan Displays the current VLAN configuration.

switch#show interfacesDisplays the interface configuration and status of line:

up/up, up/down, admin down.

switch#show interface

vlan1

Displays setting of virtual interface VLAN 1, the default

VLAN on the switch.

To Reset Switch Configuration

Switch#delete

flash:vlan.datRemoves the VLAN database from flash memory.

Delete filename [vlan.dat]? Press Enter

Delete flash:vlan.dat?[confirm]

Press Enter

Switch#erase startup-

configErases the file from NVRAM.

Switch#reload Restarts the switch.

T S t H t N


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To Set Host Names

Switch#configure terminal Moves to global configuration mode

Switch(config)#hostname

Switch1

Creates a locally significant host name of the switch.

This is the same command as the router.

Switch1(config)#

To Set Passwords

Switch(config)#enable

password vinitaSets the enable password to vinita

Switch(config)#enable

secret nikkiSets the encrypted secret password to nikki

Switch(config)#line console

0Enters line console mode

Switch(config-line)#login Enables password checking

Switch(config-

line)#password vinitaSets the password to vinita

Switch(config-line)#exit Exits line console mode

Switch(config-line)#line vty

0 4Enters line vty mode for all five virtual ports

Switch(config-line)#login Enables password checking

-

Sets the password to vinita


15/24df di b PRO iAre you a developer? Try out the HTML to PDF API

line)#password vinitaSets the password to vinita

Switch(config-line)#exit Exits line vty mode

Switch(config)#

To Set IP Addresses and Default Gateways

Switch(config)#interface

vlan1

Enters the virtual interface for VLAN 1, the default VLAN

on the switch

Switch(config-if)#ip address

192.168.0.10 255.255.255.0

Sets the IP address and netmask to allow for remote

access to the switch

Switch(config-if)#exit

Switch(config)#ip default-

gateway 192.168.0.5Allows IP information an exit past the local network

To Set Interface Descriptions


fastethernet 0/1Enters interface configuration mode

Switch(config-

if)#description Finance

VLAN

Adds a description of the interface

To Set Duplex Operation


fastethernet 0/1Moves to interface configuration mode

-

Forces full duplex operation


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fullForces full-duplex operation

Switch(config-if)#duplex

autoEnables auto-duplex config

Switch(config-if)#duplex

halfForces half-duplex operation

To Set Operation Speed


fastethernet 0/1

Switch(config-if)#speed 10 Forces 10-Mbps operation

Switch(config-if)#speed 100 Forces 100-Mbps operation

Switch(config-if)#speed

autoEnables autospeed configuration

MAC Address Table

switch#show mac address-

tableDisplays current MAC address forwarding table

switch#clear mac address-table

Deletes all entries from current MAC address forwardingtable

switch#clear mac address-

table dynamicDeletes only dynamic entries from table

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< Prev Next >

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2960 switch overview functionality and Switch Bootup Process

Basic of switching Method of switching Functions of bridging

Basic Switch configurations commands

VLAN advantages disadvantage Membership and VTP

How to Configure VLAN, STP, DTP step by step guide

Basic functionality of STP Spanning Tree Protocol

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Written by Sanjay Kumar

Comments

#Riscks D.Kollie,JR 2014-07-24 11:13

Very much good help me a lot to do more practice

#Cidriek 2014-06-27 12:34

Thanks for the info. In fact, you did answered my questions. Thanks!

#astro 2014-06-25 06:48

It so easy to understand I LIKED it.Thanks

#chenthil 2014-06-20 18:40

good guide we can easily understand

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#maliro ivan 2014-06-18 14:59

thanks very much , it is a nice and well summarized,easily understandable and really

they have helped me alotMAY THE ALMIGHTY LORD REWARD U

#Jorsef 2014-06-06 03:35

Very helpful thanks so mcuh

#A.Rahman 2014-05-18 06:19

Cool Info keep it up. :>

#Raj 2014-05-12 10:32

How to create access list to allow SSH access for few IP address (eg 10.149.21.0/24)

#rajkumar 2014-05-12 06:57

Very good information

#krishna 2014-04-09 06:21

good add more commands

#sunil chambhore 2014-03-13 06:16

i have learning that time no chance for me very hard work to learning.thank you for meadvise.

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19/24









#Calvan 2014-02-13 06:30

no mention,use the right command and all working good

#aditya 2014-01-20 16:44

VERY GOOD METHOD AND THANKU FOR computernetworkingnotes

#Calvan 2014-02-13 06:28

No mention,As long the command is correct and jageted .Is good to have it.

#Collins285 2014-01-12 19:22

Thank you so much at least I can start somewhere with people like you around.

#Eelo 2013-12-05 18:25

Really great guide but you forgot what is probably the most important command:copy running-config startup-config

otherwise any changes you may have jsut made to your configuration will just go right outthe window other than that good job.

#Mega 2014-02-14 02:22

Um nice guide. But i wonder what is copy running-config startup-config?

#Eelo 2014-02-17 13:37

Its the command that overwrites the current startup confuguration with the current


20/24









p grunning configuration. in other words if you dont use it all the changes made toyour switch will be lost when it shuts off

#GURULINGAPPA 2013-12-05 02:33

it's useful for fresher

#putar 2013-12-04 14:44

nice guide, thank you so much

#akpro aim flix 2013-12-03 16:12

I am very glad I had with you this doc

#jasmine 2013-11-29 19:50

Thanks for your outstanding memorial encounter and I also had such an experienceRemote control system for lights and fans

#vijo 2013-11-07 09:20

iam not able to send a message from the pc0 to pc2..help plz

#Joshua Bachuba 2013-11-05 17:26

excellent guide, it is helpfully

#wadood masood 2013-10-14 05:12

wowwwwwwww grate ???????????????? nice method


21/24








g

#Ramesh 2013-10-11 14:11

thanks a lot....this information help me a lot......thank you verymuch

#come2i 2013-10-07 13:41hihow come i cannot config interface ip address on a cisco switch 2960 in packet tracerSwitch(config-if)#ip address 192.168.0.10 255.255.255.0

help the new beeeeee

#suman 2013-10-04 10:34

it is very good medium to understand ......thanku u cisco.

#bharat rathod 2013-09-24 07:34

OOOOOOOSUM every single line is very useful if anyone want to know about switchinghe or she do not need to go any where else..good guide and method....

thanx verry verry much

#Ravishankar 2013-09-24 04:14

Very good information, thanks a lot for sharing the switch details.

#vineeth 2013-09-10 10:50

great,i liked very much.



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#P.K.pandya 2013-09-08 08:36

good guide........ .. ...

#Ajaz Wani 2013-09-07 07:19

OOOOOOOSUM every single line is very useful if anyone want to know about switchinghe or she do not need to go any where else..

I am very thankfull who ever is behind this. Thanks sir thanks very much this helps me a

lot.

#krishna p acharya 2013-09-03 06:12

good guide and method....

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