Dell Force10 S4820T S4820T Configuration Guide - Page 446

www.dell.com | support.dell.com Loopback Interfaces A Loopback interface is a virtual interface in which the software emulates an interface. Packets routed to it are processed locally. Since this interface is not a physical interface, you can configure routing protocols on this interface to provide protocol stability. You can place Loopback interfaces in default Layer 3 mode. To configure a Loopback interface, use the following command in the CONFIGURATION mode: Command Syntax interface loopback number Command Mode Purpose CONFIGURATION Enter a number as the loopback interface. Range: 0 to 16383. To view Loopback interface configurations, use the show interface loopback number command in the EXEC mode. To delete a Loopback interface, use the no interface loopback number command syntax in the CONFIGURATION mode. Many of the same commands found in the physical interface are found in Loopback interfaces. See also Configuring ACLs to Loopback. Null Interfaces The Null interface is another virtual interface created by the E-Series software. There is only one Null interface. It is always up, but no traffic is transmitted through this interface. To enter the INTERFACE mode of the Null interface, use the following command in the CONFIGURATION mode: Command Syntax interface null 0 Command Mode CONFIGURATION Purpose Enter the INTERFACE mode of the Null interface. The only configurable command in the INTERFACE mode of the Null interface is the ip unreachable command. Port Channel Interfaces Port channel interfaces support link aggregation, as described in IEEE Standard 802.3ad. This section covers the following topics: 446 | Interfaces