[c-nsp] Cisco 3550-12G VSI stops routing traffic

[Jeff Kell]

Are you using route authentication?  We had issues with SVI VRF 
interfaces with some recent specific IOS releases (worked in older 
releases).  If you are doing authentication and this might be relevant, 
let me know and I'll fish up the details.

In our case, EIGRP with route authentication simply didn't work, and 
there was a bug ID assigned.

Jeff