From: Curtis Lindsay (clindsay_98@xxxxxxxxx)
Date: Fri Apr 27 2001 - 16:49:26 GMT-3
The ip classless command is not to tell a protocol
ospf, BGP, EIGRP to function in classless mode. It is
for default routing only. If ip classless is not
turned on and you put a default static on the router
it will not show up in the routing table. The router
will run CIDR blocks without ip classless on.
Test it in the lab.
Thanks
Curtis
--- daneyon hansen <daneyonhansen@hotmail.com> wrote:
> I believe your understanding of ip classless is a
> little off. By
> default, a router will make IP forwarding decisions
> based on the first
> few high ordered bits of the first octect in the
> destination address
> within the IP header. ie...01 class A, 10 class B
> and 110 class C. By
> turning on IP classless, your telling the router not
> to make forwarding
> decisions based on the first few bits of the
> destination address. Your
> telling the router to make the longest match when
> compaing the
> destination address of the IP packet to the routing
> table. So it really
> has nothing to do with default routing, IP classless
> or no IP classless
> the router will still route to it's default.
>
>
>
> Daneyon
>
> >From: "radha rani" >Reply-To: "radha rani" >To:
> ccielab@groupstudy.com
> >Subject: ip classless >Date: Fri, 27 Apr 2001
> 10:00:06 -0400 > >I have a
> question re: ip classless. My understanding is that
> if >there is no
> >specific route for a subnet in the routing table,
> this command >allows
> the >router to forward packets to unknown
> destinations using the default
> >route. >This being the case when the destination is
> a subnet of a
> network >which is >known to the router. > >My
> question is : since OSPF is
> a classless protocol, why do I need >this >command
> to have the router
> forward packets using the default route. >I see
> >this all the time where
> the router will not utilize the default >route until
> >this command is
> added. > >I can unserstand needing it with IGRP/RIP
> but why with OSPF? >
> >Can someone expalin. Thanks so much.
>
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