Dynamic acquisition of network topology

The network topology abstraction daemon (ntad) provides the functionality to dynamically acquire the network topology. The NorthStar Controller runs Junos OS in a virtual machine (VM) that uses BGP-LS (the preferred protocol) or OSPF/IS-IS to learn the network topology. In Junos OS, BGP-LS or IGP publishes the acquired topology it learns into the traffic engineering database, which provides an in-memory representation of the network topology. The network topology abstraction daemon produces a copy of the traffic engineering database that the topology server uses.