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New Member

benefit of loopback interface

why do we use a loopback, is it just for when we are using routing protocols, and if say a router has 2 interfaces, the loopback can be reached from both ?

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New Member

Re: benefit of loopback interface

Hello Carl,

Loopback interfaces are indeed often used with routing protocols as ospf, bgp, eigrp.

The advantage is that loopback interfaces are always up, because they are virtual. If they can be reach depends ofcourse on your routing protocol.

Ik you have for example a router with 3 physical interfaces all connected and your routing is configured correctly then the remote side can always reach your loopback till all paths (physical) are down.

But there are a lot more reasons to use loopbacks, but i think this one is the most important one.

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