Dell S4048-ON, Configuration Manual

Page: 371 / 1039

Configuring Layer 2 (Data Link) Mode
Do not configure switching or Layer 2 protocols such as spanning tree protocol (STP) on an interface unless the interface has been
set to Layer 2 mode.
To set Layer 2 data transmissions through an individual interface, use the following command.
• Enable Layer 2 data transmissions through an individual interface.
INTERFACE mode
switchport
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
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
!
Interfaces
371