1. A network management system (NMS), comprising a controller programmed to: establish between first and second customer edge (CE) routers in a full mesh packet network a first logical data tunnel conforming to an isolation protocol; establish between the first and second CE routers a second logical data tunnel conforming to the isolation protocol; direct one or more routers associated with at least one of the first and second logical data tunnels to perform synchronization between the first and second logical data tunnels; enable packet data exchanges between the first and second CE routers over the first logical data tunnel as a primary transport; direct the first and second CE routers to duplicate the packet data exchanged between them over the second logical data tunnel; and direct the first and second CE routers to synchronously switch to the second logical data tunnel as the primary transport of packet data upon detecting a fault in the first logical data tunnel.