Configuration Task List for Physical InterfacesBy default, all interfaces are operationally disabled and traffic does not pass through them.The following section includes information about optional configurations for physical interfaces:• Overview of Layer Modes• Configuring Layer 2 (Data Link) Mode• Configuring Layer 2 (Interface) Mode• Management Interfaces• Auto-Negotiation on Ethernet Interfaces• Adjusting the Keepalive Timer• Clearing Interface CountersOverview of Layer ModesOn all systems running Dell Networking OS, you can place physical interfaces, port channels, and VLANsin Layer 2 mode or Layer 3 mode.By default, VLANs are in Layer 2 mode.Type of Interface Possible Modes Requires Creation Default State10/100/1000 Ethernet,10 Gigabit EthernetLayer 2Layer 3No Shutdown (disabled)Management N/A No Shutdown (disabled)Loopback Layer 3 Yes No shutdown (enabled)Null interface N/A No EnabledPort Channel Layer 2Layer 3Yes Shutdown (disabled)VLAN Layer 2Layer 3Yes, except for thedefault VLAN.No shutdown (disabledfor Layer 2)Shutdown (active forLayer 3 )Configuring Layer 2 (Data Link) ModeDo not configure switching or Layer 2 protocols such as spanning tree protocol (STP) on an interfaceunless the interface has been set to Layer 2 mode.To set Layer 2 data transmissions through an individual interface, use the following command.• Enable Layer 2 data transmissions through an individual interface.INTERFACE modeswitchport320 Interfaces
