There's two other things I have heard of for loopbacks. I once talked to
someone who worked at a major carrier who always telneted into the routers
using the loopback addresses. They also used the loopback address as the
name of the router.
It makes a lot of sense in a situation where you are making changes all the
time on interfaces to be able to keep the interface that you telnet into
constant. (Of course you have to have the subnet that the loopback
interfaces participate in a routing protocol.)
Also, if you are doing any kind of SNMP management of the routers, it helps
to have the IP address constant, that way, if an interface goes down, it's
possible to reach the router if there's an alternate path.
""Atul Kumar Udupi"" <[EMAIL PROTECTED]> wrote in message
99v4ts$8fv$[EMAIL PROTECTED]">news:99v4ts$8fv$[EMAIL PROTECTED]...
> 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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