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"ip classless": how does it work?

Hi, there. This is the description I found for this command at Cisco's site:

"At times the router might receive packets destined for a subnet of a network that has no network default route. To have the Cisco IOS software forward such packets to the best supernet route possible, use the ip classless global configuration command. To disable this feature, use the no form of this command."

I think I get it, but could anybody give me a practical example of it?

What would be a typical net topology for this command?

I've had some IGRP routing problems when this command was active. I just want to know if I should disable it.

Thanks.

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