passive interface lo

From: k c (jwongccie@yahoo.com.hk)
Date: Fri Oct 03 2003 - 08:36:40 GMT-3

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I have seen the command "passive interface lo0" configured in some routing protocols like rip, eigrp, ospf, isis. What does this mean? Loopback is not a physical interface, why make it passive? What is the theory behind?

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