What is a loopback interface cisco

02.07.2018 | by Meg
Learn how to configure loopback interfaces on cisco router. Loopback interfaces are logical interfaces or you can say virtual interfaces in cisco router. A loopback interface is not a physical interface like Fast Ethernet interface or Gigabit Ethernet interface.
Even if there is some physical outbound interface is down, the logical interface loopback helps maintain the neighbor ship to be up. Cisco routers can be configured with loopback interfaces, but they don't have loopback interfaces until you create one. Loopback interfaces interfaces are always up and running and always available, even if other physical interfaces in the router are down. The loopback interface needs to be created manually on the router. BGP Configuration on Cisco IOS. What is loopback interface in a Cisco Router.
The idea of a loopback interface is that it is a virtual interface which never goes down due to a physical line or network problem. A loopback interface is a logical, virtual interface in a Cisco Router. Since this loopback interface is always up, it is also used with BGP Border Gateway Protocol. A loopback interface has many uses. This lab will teach you how to configure a Loopback interface. This video will show you how to self-install your new Shaw Home Modem without waiting for an appointment.