[...]
Colocated BGP4 "proxies" (I'm still not sure what to call these,
anyone?)
[...]
How about RCP (routing control processor)? And you could call the
forwarding box a PSP (packet switching processor).
Unless of course IBM has trademarked these or something.
--John
P.S.: For nostalgia's sake the RCP and PSP could talk over a 4 Mbit token-ring.