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New Member

loopback interface

can anyone tell me what is the use of a loopback interface ? thanks.

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Cisco Employee

Re: loopback interface

New Member

Re: loopback interface

Loopback interfaces are used to provide an interface that never goes down. Routing protocols can use loopback interfaces as support interfaces to set a router ID (in OSPF), or to advertise an IP network (in routing protocols, listing a network in the 'network w.x.y.z' statement won't advertise the network if it doesn't exist on the router. assigning the network to a loopback interface allows the IP network to exist on the router).

There are other uses too, but these are some major reasons to see them in a configuration.

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