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Dell EMC Configuration Guide for the S3100 Series 9.14.2.4

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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

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.
DellEMC(conf-if)#show config
!
interface GigabitEthernet 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 Gi 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.

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