Could someone explain the importance of using loopback interfaces? I keep
reading that it is important when using routing protocols to use loopback
interfaces. A consultant that is writing documentation for me suggested I
obtain an entire class C network just for loopback addresses. Cisco says
when configuring BGP that, "We recommend you use a loopback interface to
guarantee reachability in networks with multiple paths." (from
http://www.cisco.com/warp/public/459/23.html#3).
Maybe I'm missing something totally obvious here, but exactly what benefit
do I gain from using loopback addresses? I know it is supposed to provide
reliability for routing protocols, but how?
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