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Overview of Layer Modes
On all systems running FTOS, you can place physical interfaces, port channels, and VLANs in Layer 2
mode or Layer 3 mode.
By default, VLANs are in Layer 2 mode.
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.
Figure 20-4 displays the basic configuration found in a Layer 2 interface.
Figure 20-4. show config Command Example of a Layer 2 Interface
To configure an interface in Layer 2 mode, use these commands in the INTERFACE mode:
Table 20-1. Interfaces Types
Type of Interface
Possible
Modes
Requires
Creation Default State
10/100/1000 Ethernet, Gigabit
Ethernet, 10 Gigabit Ethernet
Layer 2
Layer 3
No Shutdown (disabled)
SONET (PPP encapsulation) Layer 3 No Shutdown (disabled)
Management n/a No Shutdown (disabled)
Loopback Layer 3 Yes No shutdown (enabled)
Null interface n/a No Enabled
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.
FTOS(conf-if)#show config
!
interface Port-channel 1
no ip address
switchport
no shutdown
FTOS(conf-if)#