interface ethernet (Layer 3)

To configure a Layer 3 Ethernet IEEE 802.3 routed interface, use the interface ethernet command.

interface ethernet [ chassis_ID /] slot / port [. subintf-port-no ]

Syntax Description

chassis_ID
(Optional) Specifies the Fabric Extender chassis ID. The chassis ID is from 100 to 199.

Note This argument is not optional when addressing the host interfaces of a Cisco Nexus 2000 Series Fabric Extender.
slot
Slot from 1 to 3. The following list defines the slots available:
  • Slot 1 includes all the fixed ports. A Fabric Extender only has one slot.
  • Slot 2 includes the ports on the upper expansion module (if populated).
  • Slot 3 includes the ports on the lower expansion module (if populated).
port
Port number within a particular slot. The port number is from 1 to 128.
.
(Optional) Specifies the subinterface separator.
subintf-port-no
(Optional) Port number for the subinterface. The range is from 1 to 48.

Command Default

None

Command Modes

Global configuration mode
Interface configuration mode

Command History

Release
Modification
5.0(3)N1(1)
This command was introduced.

Usage Guidelines

You must use the no switchport command in the interface configuration mode to configure the interface as a Layer 3 routed interface. When you configure the interface as a Layer 3 interface, all Layer 2 specific configurations on this interface are deleted.

Use the switchport command to convert a Layer 3 interface into a Layer 2 interface. When you configure the interface as a Layer 2 interface, all Layer 3 specific configurations on this interface are deleted.

Examples

This example shows how to enter configuration mode for a Layer 3 Ethernet interface 1/5:

switch(config)# interface ethernet 1/5
switch(config-if)# no switchport
switch(config-if)# ip address 10.1.1.1/24
switch(config-if)#
 

This example shows how to enter configuration mode for a host interface on a Fabric Extender:

switch(config)# interface ethernet 101/1/1
switch(config-if)# no switchport
switch(config-if)# ip address 10.1.1.1/24
switch(config-if)#
 

This example shows how to configure a Layer 3 subinterface for Ethernet interface 1/5 in the global configuration mode:

switch(config)# interface ethernet 1/5.2
switch(config-if)# no switchport
switch(config-subif)# ip address 10.1.1.1/24
switch(config-subif)#
 

This example shows how to configure a Layer 3 subinterface in interface configuration mode:

switch(config)# interface ethernet 1/5
switch(config-if)# interface ethernet 1/5.1
switch(config-if)# no switchport
switch(config-subif)# ip address 10.1.1.1/24
switch(config-subif)#
 

This example shows how to convert a Layer 3 interface to a Layer 2 interface:

switch(config)# interface ethernet 1/5
switch(config-if)# no switchport
switch(config-if)# ip address 10.1.1.1/24
switch(config-if)# switchport
switch(config-if)#
 

Related Commands

Command
Description
bandwidth
Sets the bandwidth parameters for an interface.
delay
Configures the interface throughput delay value.
encapsulation
Sets the encapsulation type for an interface.
ip address
Sets a primary or secondary IP address for an interface.
inherit
Assigns a port profile to an interface.
interface vethernet
Configures a virtual Ethernet interface.
no switchport
Configures an interface as a Layer 3 interface.
service-policy
Configures a service policy for an interface.
show fex
Displays all configured Fabric Extender chassis connected to the switch.
show interface ethernet
Displays various parameters of an Ethernet IEEE 802.3 interface.