How to Configure Interfaces for the 3560 Switch?

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Interface configuration is one of the most important configurations of the switch. Without interfaces, the switch is useless. Interface configurations must be exact to be able to communicate with other devices. Interface configuration will be presented for three different devices (in labs 4.10 – 4.12) so that you can see differences among the interfaces:

Cisco 2621 Router

Cisco 2811 Router

Catalyst 3560 Switch

Network Layout: Load the network layout you have been working with for labs in section 4.

Configure Interfaces for the 3560 Switch

Interfaces correspond to the physical ports available on a device. In this instance the Cisco 3560 switch has eight fast ethernet ports. As you read through the following steps you will notice a correspondence between interface and port names. This means you have to use the same names or shortcut commands as the names of the ports.

How to Configure Interfaces for the 3560 Switch

Lab Steps

1. On the Network Visualizer screen, double-click on 3560 Switch A. This will bring up a console screen.

2. Press enter and the Switch> prompt will appear. You are now in the user mode.

3.  Change to the privileged mode.



4. Change to the global configuration mode.


Configuring from terminal, memory, or network [terminal]?enter

Enter configuration commands, one per line.  End with CTRL/Z.


5. Type interface ? to see all the interfaces available on the router.

Switch(config)#interface ?

Async              Async interface
 BVI                Bridge-Group Virtual Interface
 CTunnel            CTunnel interface
 Dialer             Dialer interface
 FastEthernet       FastEthernet IEEE 802.3
 Filter             Filter interface
 Filtergroup        Filter Group interface
 GigabitEthernet    GigabitEthernet IEEE 802.3z
 Group-Async        Async Group interface
 Lex                Lex interface
 Loopback           Loopback interface
 Null               Null interface
 Port-channel       Ethernet Channel of interfaces
 Portgroup          Portgroup interface
 Pos-channel        POS Channel of interfaces
 Tunnel             Tunnel interface
 Vif                PGM Multicast Host interface
 Virtual-Template   Virtual Template interface
 Virtual-TokenRing  Virtual TokenRing
 Vlan               Catalyst Vlans
 fcpa               Fiber Channel
 range              interface range command

The output will vary depending on the type of router device you are connected to.

6. The 3560 switch has eight Fast Ethernet 10/100BaseT ports. For example, the Fast Ethernet interface configuration is shown below:

Switchconfig)#interface fastethernet ?

<0-0>  FastEthernet interface number

Switch(config)#int fastethernet 0

% Incomplete command.

Switch(config)#int fastethernet 0?


Switch(config)#int fastethernet 0/?

<1-8>  FastEthernet interface number

Notice that you cannot type int Fast Ethernet 0/. You must type the full command, which is type slot/port, or int fastethernet 0/0. You can type the shortcut int fa 0/0 as well.

7. At this point you must choose the interface you want to configure. Once you do that, you will be in interface configuration for that interface. The command to choose Fast Ethernet port 1, for example, would be:

Switch(config)#int fasthernet 0/1



—Original tutorial appeared at

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