[c-nsp] Strange RIP behaviour

[Michael Costello]

On 17/06/05, Marco Matarazzo <marmata at libero.it> wrote:
> Hi all,
> 
> today I had a problem I cannot explain.
> I'm using Cisco 3550-48-SMI with IOS  12.1(22)EA1 as access switches for our
> customers. Each customer has a routed port on the 3550. The 3550 announces
> the connected and static routes via RIP to a couple of 7206 (my borders).
> The 7206 announce via RIP the default to the 3550. Everything works fine,
> but today all of sudden, a static route was marked as "possibly down", and
> my borders began to throw all traffic destined to that subnet to Null0 (as
> designed).
> 
> This is the relevant sanitized config:
> 
> interface FastEthernet0/35
>  ip address 1.2.3.4 255.255.255.252
> 
> ip route 1.6.7.8 255.255.255.240 1.2.3.4

How close is this santized configuration to reality?  You have a
network address configured on the FastEthernet interface and a static
route pointed at it, as opposed to the customer's side.