OSPF
Open Shortest Path First (OSPF) is an interior gateway
protocol (IGP) that is most often used to dynamically manage network
routes in large enterprise networks. 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.
The Palo Alto Networks implementation of OSPF fully supports
the following RFCs:
The following topics provide more information about the OSPF
and procedures for configuring OSPF on the firewall: