1. Basically loopback address is used to test whether tcpip protocol stack
is installed properly and working fine on a machine. Assume that just now
you have added tcpip to your machine and there is no ip address assigned at
that time one can use looopback ip address to verify the tcpip installation
by pining to the loopback interface.
2. And as u said some dynamic routing protocols use loopback as a
ROUTER-ID. This is because loopback address is logical and available most of
the time to the peer. You can use ip address of any hardware interface of a
router, but problem is incase the interface goes bad. To avoid that its
better to use loopback ip address as a router id.
Hope this helps.
Atul kumar
"Asad Hasan" <[EMAIL PROTECTED]> wrote in message
98o5a6$vn1$[EMAIL PROTECTED]">news:98o5a6$vn1$[EMAIL PROTECTED]...
> What is the primary purpose of using the Loopback interface and can you
> telnet into a router using a IP assigned to the Loopback interface. I know
> the Loopback interfaces are used in OSPF and in BGP. But is there any
other
> purpose for them.
>
> Regards
> Asad
>
>
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