12/25/2023 0 Comments Loopback ipLoopback interfaces can establish a telnet session from router console port to the auxiliary port when all physical interfaces are down. They help to select, designated router and Backup Designated router when the routing protocol OSPF is configured in the network. The loopback address is used by OSPF as router ID to stabilize the process. The loopback address is used to access the router for management. We can also use the ping command to verify if a router IP stacks working properly. Loopback interfaces are automatically turned on immediately after configuring the interface on a router. Loopback interfaces will go down only when then the router is down. When the circuit is down, the loopback interfaces isolate the fault on. The Loopback interfaces play a vital role in troubleshooting. The IP address assigned and advertised over the network, the loopback interface is used to communicate with the router whose interfaces are down. We can overcome this issue by configuring a loopback interface. As the interface is down, the other routers in the network cannot communicate with this router. Physical interfaces can go down or manually disabled for maintenance. The loopback interface will not go down unless an administrator gives the command shutdown or router is manually down. The software or virtual interfaces do not have any hardware components and these interfaces are independent of the state of any physical interface.Īny information or packet sent out through loopback interface is received immediately by the same loopback interface. Unlike physical interfaces, Fast Ethernet and Gigabit Ethernet, the loopback interface is a virtual or logical interface or a software interface present in the Cisco routers.
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