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Example of a Basic Layer 2 Interface Configuration
Dell(conf-if)#show config
!
interface Port-channel 1
no ip address
switchport
no shutdown
Dell(conf-if)#
Configuring Layer 2 (Interface) Mode
To configure an interface in Layer 2 mode, use the following commands.
• Enable the interface.
INTERFACE mode
no shutdown
• Place the interface in Layer 2 (switching) mode.
INTERFACE mode
switchport
For information about enabling and configuring the Spanning Tree Protocol, refer to Spanning Tree
Protocol (STP).
To view the interfaces in Layer 2 mode, use the show interfaces switchport command in EXEC
mode.
Configuring Layer 3 (Network) Mode
When you assign an IP address to a physical interface, you place it in Layer 3 mode.
To enable Layer 3 mode on an individual interface, use the following commands. In all interface types
except VLANs, the shutdown command prevents all traffic from passing through the interface. In VLANs,
the shutdown command prevents Layer 3 traffic from passing through the interface. Layer 2 traffic is
unaffected by the
shutdown command. One of the interfaces in the system must be in Layer 3 mode
before you configure or enter a Layer 3 protocol mode (for example, OSPF).
• Enable Layer 3 on an individual interface
INTERFACE mode
ip address
• Enable the interface.
INTERFACE mode
no shutdown
Example of Error Due to Issuing a Layer 3 Command on a Layer 2 Interface
If an interface is in the incorrect layer mode for a given command, an error message is displayed (shown
in bold). In the following example, the ip address command triggered an error message because the
interface is in Layer 2 mode and the ip address command is a Layer 3 command only.
Dell(conf-if)#show config
!
interface TengigabitEthernet 1/2
Interfaces
403