By default, when performing a look-up in the route table a router will
first try to match the major network then the subnet--if there's no
match and no default network route, the packet's dropped. Again this is
the default behavior.
With ip classless, you enable the router to forward the packet to the
route with the best match without regard to the class of the
destination.
Many examples and explanations are available on Cisco's web page and in
numerous books on IP routing. Personally I like those in Jeff Doyle's
Routing TCP/IP Vol. I
Good luck. Aloha, Frank
Cisco Kid wrote:
>
> Hi,
>
> Can someone pls. give me a simple explanation of the IP Classless command
> and why/when it is necessary.
>
> Thanks
>
> Rashid
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