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 andbecome familiar with the different levels of access on the switch. You will also becomefamiliar with the commands available to you in each mode (user or privileged) and theswitch help facility, history, and editing features.

User vs. Privileged Mode

User mode is indicated with the > next to the switch name. You can look at settings butcan not make changes from user mode. In Privilege mode, indicated by the #, you can doanything. 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 allavailable commands for the switch in your current mode. You can also use the questionmark after you have started typing a command. For example if you want to use a showcommand but you do not remember which one it is, use the ? as this will output allcommands that you can use with the show command.

Configuration Mode

From privilege mode you can enter configuration mode by typing config term commandyou can exit configuration mode type type end or +z

To practically implement these command either create a simple topology on packet tracer or download this topology.

To know all available command on user exec mode type ? and press enter


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 use any one


Switch>enable

Switch#disable

Switch>exit




Switch con0 is now available




Press RETURN to get started.

Show version command will tell about the device platform and detected interface and ios name


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 address command will show all detected mac address dynamically and manually


Switch#show mac-address-table

          Mac Address Table

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




Vlan    Mac Address       Type        Ports

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




   1    0001.643a.5501    DYNAMIC     Gig1/1

Run time configuration of ram can be any time by simple show run commands


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 start command


Switch#show startup-config

Current configuration : 925 bytes

version 12.2

no service password-encryption

!

hostname Switch




[Output is omitted]

show vlan command will give the detail overview of all vlan configured on switch


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

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 1 will 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 Don’t add space between flash and vlan.dat Run this exactly shown here adding a space could erase flash entirely leaving switch blank


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

use configure terminal command 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

Set enable password to vinita and secret to nikki


Switch1(config)#enable password vinita

Switch1(config)#enable secret nikki

Set console password to vinita and enable it by login command, order of command is important set password before you enable it


Switch1(config)#line console 0

Switch1(config-line)#password vinita

Switch1(config-line)#login

Switch1(config-line)#exit

Enable 5 telnet session [ vty0 - vty4] for router and set their password to vinita


Switch1(config)#line vty 0 4

Switch1(config-line)#password vinita

Switch1(config-line)#login

Switch1(config-line)#exit

Now set switch ip address to 192.168.0.10 255.255.255.0 and default gateway to 192.168.0.5


Switch1(config)#interface vlan1

Switch1(config-if)#ip address 192.168.0.10 255.255.255.0

Switch1(config-if)#exit

Switch1(config)#ip default-gateway 192.168.0.5

Set a description finance VLAN to 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

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

Switch1(config-if)#duplex half

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

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1,

changed state to down

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state 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     Gig1/1

Switch1#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 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).
*switch#show mac-address-table*	Displays the current MAC address forwarding table .
*switch#show running-config*	Displays 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 interfaces*	Displays 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.dat*	Removes the VLAN database from flash memory.
*Delete filename [vlan.dat]?*	Press Enter
*Delete flash:vlan.dat? [confirm]*	Press Enter
*Switch#erase startup-config*	Erases the file from NVRAM.
*Switch#reload*	Restarts the switch.
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 vinita*	Sets the enable password to vinita
*Switch(config)#enable secret nikki*	Sets the encrypted secret password to nikki
*Switch(config)#line console 0*	Enters line console mode
*Switch(config-line)#login*	Enables password checking
*Switch(config-line)#password vinita*	Sets the password to vinita
*Switch(config-line)#exit*	Exits line console mode
*Switch(config-line)#line vty 0 4*	Enters line vty mode for all five virtual ports
*Switch(config-line)#login*	Enables password checking
*Switch(config-line)#password vinita*	Sets 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 192.168.0.5*	Allows IP information an exit past the local network
To Set Interface Descriptions
*Switch(config)#interface fastethernet 0/1*	Enters interface configuration mode
*Switch(config-if)#description Finance VLAN*	Adds a description of the interface
To Set Duplex Operation
*Switch(config)#interface fastethernet 0/1*	Moves to interface configuration mode
*Switch(config-if)#duplex full*	Forces full-duplexoperation
*Switch(config-if)#duplex auto*	Enables auto-duplex config
*Switch(config-if)#duplex half*	Forces half-duplex operation
To Set Operation Speed
*Switch(config)#interface 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 auto*	Enables autospeed configuration
MAC Address Table
*switch#show mac address-table*	Displays current MACaddress forwarding table
*switch#clear mac address-table*	Deletes all entries fromcurrent MAC addressforwarding table
*switch#clear mac address-table dynamic*	Deletes only dynamicentries from table

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KNOWLEDGE IS POWER

Basic Switch Configurations Command

User vs. Privileged Mode

HELP

Configuration Mode

CCNA basic switch configuration commands sheet

Video Of Day

Basic Switch Configurations Command

User vs. Privileged Mode

HELP

Configuration Mode

CCNA basic switch configuration commands sheet

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