1. In a computer network having plural routers and plural logically centralized but physically distributed servers, a method of routing communications from a source network through the computer network to a destination network, in which the computer network includes (a) first edge routers (ERs) configured to interface with the source and destination networks and (b) core routers, and in which the source and destination networks include neighboring ERs configured to interface with the first ERs, the method comprising: causing the servers, distinct from the routers, to collectively centrally govern routing of the communications among the first ERs, the core routers, and the neighboring ERs, the centrally governing including both: a) causing the servers to use iBGP to govern routing through the first ERs and the core routers; and b) causing the servers to use eBGP to govern routing through the neighboring ERs; wherein the causing the servers to use both iBGP and eBGP enables the servers to have complete visibility of all routes available in the computer network.