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  • I understand what it's used for, but I don't get how it works. Router(config)#interface loopback 1 Router(config-if)#ip address 192.168.0.1 255.255.255.0 when you give those instruction, does the router do what a switch would do when you create a SVI ? Commented Jul 24, 2017 at 11:29
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    The loopback interface provides a stable address for protocols (eg BGP, Telnet) to use so that they can avoid any impact if a physical interface goes down. The loopback interface is not associated with any particular vlan, it's local to the device itself as an "internal" interface that needs to be routed to (within the device), to reach it. Commented Jul 24, 2017 at 12:05