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What is loopback?
kobebrian
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kplab
A loopback interface is a logical interface with no real hardware associated with it, and it does not physically connect to a network. It is often used for testing purposes.
In addition, a loopback interface can be used as an IP interface that is always up and reachable. Because of this property, the IP address of a loopback interface is suitable to be used as the identifier of the router. For example, OSPF uses the highest IP address assigned to a loopback interface as the router's Router ID (RID).
darkuser
http://en.wikipedia.org/wiki/Loopback
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