The package, drcl.inet.protocol.OSPF, implements the link-state routing
protocol, OSPF v2, Open Shortest Path First routing protocol and follow
the RFC2328.
OSPF() -
Constructor for class drcl.inet.protocol.ospf.OSPF
The information exchanged with other adjacent nodes is described by a OSPF_Neighbor
data structure, which is bounded to a specific OSPF router interface.
Constructor: Create new ospf6 interface structure
In our implementation, this function is called when OSPF receives
NEIGHBOR_UP event so that the state of interface is UP