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LoopBack Interface command on routers???

ewieczorek
Beginner
Beginner

Hello everyone! I have a WAN that comprises of 32 sites throughout the state of Nebraska. Each site has a 3725 series router.

I was at a conference and someone asked me if I made use of the loopback interface on my routers. I told him I didn't know much about this command on the router. I was then told that I should consider using the LoopBack Interface command on my routers. This person didn't really go into much detail for me after that.

Could someone provide me with some general information about this? Why would one use it? What's the benefit? Any general thoughts....

Thank you!

Eric

5 Replies 5

bratager
Beginner
Beginner

Basically, the loopback interface is a virtual interface that you configure on the router. Being a virtual interface, it never goes down unlike physical interfaces so as long as you have one physical interface reachable on your router, you should be able to reach the loopback. This makes the loopback ideal for things such as network management traffic and DLSW. Also, routing protocols such as OSPF and EIGRP use the loopback address for the router ID so using a loopback interface gives you better control of the router ID and allows for easier administration.