Swati,

 I'd look at it from a different perspective.
 For consistency reasons, you have to include the metric
 in the LSA. Using a "special" metric value for loopbacks
 does not give you much, so there's no reason to specify
 something like this.

--
Alex Zinin
Thursday, November 29, 2001, 4:32:19 AM, Swati Rastogi wrote:
> Hi,
> [snip from rfc 2328 ..]
> "When the router's interface to the network is in looped back state it will
> be unavailable for regular data traffic. However, it may still be desirable
> to gain information on the quality of this interface, either through sending
> ICMP pings to the interface or through something like a bit error test.
> Hence, IP packets may still be addressed in the looped back state. To
> facitilitate this, such interfaces are advertised in router LSAs as single
> host routes, whose destination is the IP interface address."
> In LSA metric will give info about the quality of the interface and if an
> interface cannot be used for data traffic by a neighbor, what is the utility
> of sending it in LSA to neighbor. What is the utility of knowing its
> quality. Can anybody please send me some scenario where this is going to be
> useful for routing purpose.
> Regards,
> Swati
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