Open Shortest Path First (OSPF) is an interior gateway
protocol (IGP) that is most often used to dynamically manage network
routes in large enterprise network. It determines routes dynamically
by obtaining information from other routers and advertising routes
to other routers by way of Link State Advertisements (LSAs). The information
gathered from the LSAs is used to construct a topology map of the network.
This topology map is shared across routers in the network and used
to populate the IP routing table with available routes.
Changes in the network topology are detected dynamically and
used to generate a new topology map within seconds. A shortest path
tree is computed of each route. Metrics associated with each routing
interface are used to calculate the best route. These can include
distance, network throughput, link availability etc. Additionally, these
metrics can be configured statically to direct the outcome of the
OSPF topology map.
Palo Alto networks implementation of OSPF fully supports the