Possibly more key: "In the Rogers network, one IP routing manufacturer uses a design that limits the number of routes that are presented by the Distribution Ro

Possibly more key: "In the Rogers network, one IP routing manufacturer uses a design that limits the number of routes that are presented by the Distribution Routers to the core routers. The other IP routing vendor relies on controls at its core routers. The impact of these differences in equipment design and protocols are at the heart of the outage that Rogers experienced." I read this as: we were halfway through a big project to replace 6509s with new Juniper switches but that takes a few years, so in the meantime we sometimes make configuration changes to each router that have different behaviors.