Auxiliary BGP box
No changes required to router hardware or software except for re-configuration to work with this box
Provides CPU, memory, and disk needed to handle BGP routing and security countermeasures
Collocated with each BGP border router
- auxiliary boxes peer with each other (with boxes in same AS and boxes collocated with neighbor routers) and the border router
- border router peers only with auxiliary box and (optionally) internal BGP routers (same AS)