Configuring Interfaces | 117Viewing Layer 3 Interface InformationTo enable Layer 3 traffic on a particular interface, use the ip routing command in Global Config mode toenable routing for the system, then add an IP address to the selected interface using the ip addresscommand — in Interface Config mode for a port or port channel, and in Interface VLAN mode for aVLAN. For details, see Layer 3 Routing on page 247.In all interface types except VLANs, the shutdown command stops all traffic from passing through theinterface. Layer 2 VLANs can only be disabled by disabling each port in the VLAN. A Layer 3 VLAN canbe disabled by removing its IP address. Layer 2 traffic on the VLAN is unaffected by this action.Before you configure or enter a Layer 3 protocol mode (for example, OSPF), you must put at least oneinterface in Layer 3 mode, but not necessarily enabled. To inspect the system for Layer 3 interfaces, use theshow ip interface brief command, which returns the report format shown in Figure 7-83.Figure 7-83. show ip interface brief Command Example of a Layer 3 InterfaceConfiguring Physical InterfacesThe following basic configuration tasks for physical interfaces are discussed in this chapter:• Enabling an Interface on page 120 (mandatory)• Configuring Speed and Duplex Mode on page 120 (optional)• Clearing Interface Counters on page 122 (optional)• Enabling Power over Ethernet Ports (PoE) on page 123 (optional)As described in Interface Support in SFTOS on page 111, three Layer 2 port types are available in S-Seriesswitches: 10/100/1000 Ethernet, Gigabit Ethernet (1G), and 10 Gigabit Ethernet (10G). The managementEthernet interface is another S-Series interface, which is enabled on some S-Series switch types as adedicated port and on all S-Series switches as a type of configuration on the management VLAN. Thisinterface type provides IP-based management access to the S-Series.By default, all physical interfaces are disabled to traffic and set to auto-negotiate speed and duplex mode.On 10/100/1000 ports and 1G ports, you can manually set the speed and duplex mode. You cannotmanually set the speed and duplex mode of 10G ports.Note: Layer 3 interfaces can only be created with the Layer 3 Package of SFTOS. Use theshow version command to determine what package is installed. See Figure 3-8 on page 35.Force10 #show ip interface briefNetdir MultiInterface IP Address IP Mask Bcast CastFwd--------- --------------- --------------- -------- --------1/0/3 10.0.0.2 255.255.255.0 Disable Disable
