[c-nsp] Bridge devices - ARP takeover

[Graham Wooden]

Hi there,

I have a customer hanging off of my edge router  
(6509/Sup32/12.2.33SXI), doing a Point-to-Point wireless shot from the  
DC to another site.
On myside, it's a L3 VLAN doing a /30 to a smaller Cisco router on the  
other end. I am then statically routing some additional subnets to the  
far end router.

After about 30 minutes of the link being powered up, the MAC address  
of local Radio appears to take over the /30, and hence all routing  
breaks.  To fix this, seems to that if I hardcode the MAC that belongs  
to the Cisco router on the far, all seems good and traffic keeps on  
trucking. The other fix that was being done until the hardcode went  
into affect, was power cycling the local radio.

My question is this:  While the hardcoding seems to be the trick to  
solve this, is there another command, maybe on the interface to  
achieve this fix too?
I have yet to find out from the customer if there are any MAC/ARP  
settings in his radios and that could be doing take over on purpose.

I am hoping that I can curb this type of behaviour without getting him  
involved.
Thoughts to this?  Thanks,

-graham