Overview Loopback Interface
Loopback interface, also called local loopback interface, is one logical virtual interface realized by software. The interface is not affected by the physical status. As long as not disabling manually, its status is always enabled. In the dynamical routing protocol, such as OSPF, you can select the IP address of Loopback interface as Router ID. For the packets sent to the Loopback interface, the device regards that the packets are sent to itself, so it does not forward the packets.
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