Because IGRP doesn't understand that 0.0.0.0 0.0.0.0 is the default network, so
you have to use ip default-network to announce the default gateway. Other
protocols like RIP, OSPF, EIGRP all don't have to use ip default-newwork
command.
Jason wrote:
> thanks a lot , if that is case my another qn is why not use ip default-n/w
> it saves time having to type in so many default routes into every individual
> routers in the same AS rt?
>
> Jason
> ""Luobin Yang"" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> >
> > ip route 0.0.0.0 0.0.0.0 172.16.2.0 is used to define a default route so
> > packet can be delivered when no route is matched.
> >
> > ip default-network 172.16.2.0 is used to propogate the previous default
> > route throughout the whole IGP, so all the routers in the IGP have a
> default
> > route via 172.16.2.0
> >
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