[j-nsp] MTU size of fxp0

[Randy Bush]

>> Actually this is an comparison trial between Juniper and Cisco.
>> I have modified the Cisco's managemnet port MTU from 1500 
>> to 9216, and it could be a routed port. So I also want to try it 
>> on the Juniper. If I succeed, I would have more than one routed
>> port. :)
> There is no point in trying to modify the MTU of fxp0, since it
> cannot be used for normal routing.

and note that this is considered a feature.  prevents crossover
from the real network to the management network and vice versa.

randy