Basic Switch Configuration
Nasir Majeed
Assistant Professor
PTCL Academy
Islamabad
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Switches
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Accessing The Switch
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CLI Modes
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Command History Buffer
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Auto-MDIX
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Basic Switch Configuration
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Switches are dedicated, specialized computers; with
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Central Processing Unit (CPU)
Random Access Memory (RAM)
Non-Volatile Random Access Memory (NVRAM)
Flash
Read Only Memory (ROM)
Operating System (IOS)
Step 1. Before starting the switch, verify:
◦All network cable connections are secure.
◦Your PC is connected to the console port.
◦Your terminal emulator application, such
as HyperTerminal, is running and
configured correctly.
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Step 2. Attach the power cable plug to the switch power supply socket.
◦Some Catalyst switches, including the Cisco Catalyst 2960 series, do not have
power buttons.
Step 3. Observe the boot sequence:
◦When the switch is on, the POST begins.
◦During POST, the LEDs blink while a series of tests determine that the switch is
functioning properly.
◦If the switch fails POST, the SYST LED turns amber.
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The auto-MDIX feature is enabled by default on switches running Cisco IOS Release
12.2(18)SE or later. For releases between Cisco IOS Release 12.1(14)EA1 and
12.2(18)SE, the auto-MDIX feature is disabled by default.
Table Link Conditions and Auto-MDIX Settings
Local Side Auto-MDIX
On
Remote Side AutoMDIX
On
With Correct Cabling
Link up
With Incorrect
Cabling
Link up
On
Off
Link up
Link up
Off
On
Link up
Link up
Off
Off
Link up
Link down
“correct cabling” means a cross-over cable and “incorrect cabling” means a straight-through cable
Switch# configure terminal
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# mdix auto
Switch(config-if)# end
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 Switch#show mac address-table
 The maximum size of the
MAC address table varies
with different switches.
–For example, the
Catalyst 2960 series
switch can store up to
8,192 MAC addresses.
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Switch#configure terminal
Switch(config)#hostname ALSwitch
ALSwitch(config)#exit
ALSwitch(config)#line console 0
ALSwitch(config-line)#password cisco
ALSwitch(config-line)#login
ALSwitch(config-line)#exit
ALSwitch(config)#line vty 0 15
ALSwitch(config-line)#password cisco
ALSwitch(config-line)#login
ALSwitch(config-line)#exit
ALSwitch(config)#enable secret class
ALSwitch(config)#interface VLAN 1
ALSwitch(config-if)#ip address 192.168.1.2 255.255.255.0
ALSwitch(config-if)# no shutdown
ALSwitch(config-if)#exit
ALSwitch(config)#ip default-gateway 192.168.1.1
ALSwitch(config)#exit
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ALSwitch#copy running-config startup-config
ALSwitch#show interface VLAN 1
ALSwitch#show running-config
ALSwitch#show startup-config
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