You need to turn off the auto-summary feature of eigrp, otherwise it will
advertises out the subnets at the classful boundary by routing to a null
interface.
Why do they do that, you ask? Well, when the packets come into the router
(the one running eigrp that advertises the route), the longest-match rule
will kick in and the packets will be routed to the appropriate interface and
won't get dumped into the null interface.
Rog
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Quadri, Habeeb
> Sent: Wednesday, June 07, 2000 1:51 PM
> To: '[EMAIL PROTECTED]'
> Subject: routing via null 0 interface
>
>
> Hi all,
>
> I am tyring to understand what does it mean when a router shows "directly
> connected, via Null0" when looking for routes using sh ip route
> xxx.xxx.xxx.xxx. I have not configured any route to go to null interface &
> router interface is up, down on both sides of link. Its a serial point to
> point link running eigrp.
>
> sh ip route xxx.xxx.xxx.xxx
> Routing entry for xx.xx.xx.0/19
> Known via "eigrp xxxx", distance 5, metric 28160, type internal
> Redistributing via eigrp xxxx
> Routing Descriptor Blocks:
> * directly connected, via Null0
> Route metric is 28160, traffic share count is 1
> Total delay is 100 microseconds, minimum bandwidth is 100000 Kbit
> Reliability 255/255, minimum MTU 1500 bytes
> Loading 1/255, Hops 0
>
>
>
> I appreciate your input.
> Thanks.
>
> Habeeb
>
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