Hi,
A loopback interface is used because it will be always up and
more over it's an logical interface. In wan connection it will be used
greatly because the interface will be always up.Please provide the
diagram or picture for second question.
-Subbi.
_
1. Using a loopback interface to define neighbours is common with IBGP but
not with eBGP . Normally the loopback interface is used to make sure the IP
address of the neighbour stays up and is independent of hardware functioning
properly. In the case of eBGP , peer routers are frequently connected
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