Reference Guide

416 | Interfaces
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Configure Layer 2 (Data Link) Mode
Use the switchport command in INTERFACE mode to enable Layer 2 data transmissions through an
individual interface. The user can not configure switching or Layer 2 protocols such as spanning tree
protocol on an interface unless the interface has been set to Layer 2 mode.
The following example displays the basic configuration found in a Layer 2 interface.
FTOS(conf-if)#show config
!
interface Port-channel 1
no ip address
switchport
no shutdown
FTOS(conf-if)#
To configure an interface in Layer 2 mode, use these commands in the INTERFACE mode:
For information on enabling and configuring Spanning Tree Protocol, Refer to Spanning Tree Protocol
(STP). To view the interfaces in Layer 2 mode, use the command
show interfaces switchport in the EXEC
mode.
Configure Layer 3 (Network) Mode
When you assign an IP address to a physical interface, you place it in Layer 3 mode. Use the ip address
command and
no shutdown command in INTERFACE mode to enable Layer 3 mode on an individual
interface. 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).
The example below shows how the
show config command displays an example of a Layer 3 interface.
FTOS(conf-if)#show config
Port Channel Layer 2
Layer 3
Yes Shutdown (disabled)
VLAN Layer 2
Layer 3
Yes, except for the
default VLAN
No shutdown (active for Layer 2)
Shutdown (disabled for Layer 3)
Command Syntax Command Mode Purpose
no shutdown
INTERFACE Enable the interface.
switchport
INTERFACE Place the interface in Layer 2 (switching) mode.
Table 21-44. Interfaces Types
Type of Interface
Possible
Modes
Requires
Creation Default State