I got this off teh Q&A forum, and thought the group would enjoy reading
it...
Question: What is the function of command ip classless in such a network
OSPF is used as the routing protocol. Would it be possible to explain it by
giving an example?
Answer:
The ip classless command makes the router consider IP classless, so that it
will not consider IP addresses to be of class A, B, and so on. So, it
enables IP addresses like 198.108.10.1 255.255.0.0. Also, when using
classful protocols like IGRP or RIP, it makes a routing decision based on
its classless nature.
It is used only if you have the gateway of last resort set and it determines
whether or not you forward traffic to the component of the major net that is
not in your forwarding table.
For example, your major network is 10.0.0.0 and subnetted with a prefix of
24 bit. Let's say that you have packets going to 10.10.10.0 and that entry
is not
in your forwarding table.
If you have no ip classless the packet is dropped whether or not you have a
gateway of last resort. If you have classless on, the default route is used.
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