Highly scalable OSPF routing in support of full mesh optical networks

A method for enabling Open Shortest Path First (OSPF) routing in a transport network, the method comprising:

• defining a network segment template comprising:
• a node area encompassing a single network node, the node area defining OSPF routing between addresses within the network node;
• a link area encompassing a single link extending from the network node to a neighbour node in the transport network, the neighbour node being topologically adjacent to the network node in the transport network, the link area defining OSPF routing between the network node and the neighbour node;
• and
• a host Area Border Router (ABR) defining OSPF routing between the node area and the area, the host ABR being configured to generate summary Link State Advertisement (LSA) messages containing a summary of addresses in the node area, and forward the summary LSA messages through the link area to the neighbor node;
• instantiating a respective instance of the network segment template for each node+link segment of the transport network;
• and
• for each network segment template instance, instantiating a respective remote ABR defining OSPF forwarding between the link area and the respective node area of an adjacent network segment template instance, the remote ABR being configured to generate summary LSA messages containing a summary of addresses reachable in the node area of the adjacent template instance, and forward the summary LSAs through the link area of the network segment template instance.