Administrator Guide

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 ip-address
● Enable the interface.
INTERFACE mode
no shutdown
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.
DellEMC(conf-if)#show config
!
interface TenGigabitEthernet 1/2
no ip address
switchport
no shutdown
DellEMC(conf-if)#ip address 10.10.1.1 /24
% Error: Port is in Layer 2 mode Te 1/2.
DellEMC(conf-if)#
To determine the configuration of an interface, use the show config command in INTERFACE mode or the various show
interface commands in EXEC mode.
Configuring Layer 3 (Interface) Mode
To assign an IP address, use the following commands.
● Enable the interface.
INTERFACE mode
no shutdown
● Configure a primary IP address and mask on the interface.
INTERFACE mode
ip address ip-address mask [secondary]
The ip-address must be in dotted-decimal format (A.B.C.D) and the mask must be in slash format (/xx).
Add the keyword secondary if the IP address is the interface’s backup IP address.
You can only configure one primary IP address per interface. You can configure up to 255 secondary IP addresses on a single
interface.
To view all interfaces to see with an IP address assigned, use the show ip interfaces brief command in EXEC mode as
shown in View Basic Interface Information.
To view IP information on an interface in Layer 3 mode, use the show ip interface command in EXEC Privilege mode.
DellEMC>show ip interface vlan 58
Vlan 58 is up, line protocol is up
Internet address is 1.1.49.1/24
Broadcast address is 1.1.49.255
Address determined by config file
MTU is 1554 bytes
Inbound access list is not set
Proxy ARP is enabled
Split Horizon is enabled
376
Interfaces