OSPF routing protocol is a typical link-state (Link-state) routing protocol, generally used in the same routing domain. Here,
routing domain
refers to one
autonomous system
(Autonomous System), i.e. the AS, which refers to a set of network exchange routing information through a unified policy routing protocol or routing each other. In the AS, all OSPF
routers
maintains an identical database describing the structure of the AS, which is stored in the database information of the corresponding link state routing domain, OSPF router which is calculated by the OSPF routing table database of.
[2]
As a link state
routing protocols
, OSPF link state multicast data LSA (Link State Advertisement) transmitted to all routers in an area, which is a distance
vector routing protocol
different. Router runs a distance vector routing protocol part or all of the
routing tables
is transmitted to adjacent routers.
[2]
On the exchange of security information, OSPF provides any information exchange between routers, if necessary, can be certified or authentication (Authentication), in order to ensure the dissemination of routing information between the router only trusted. OSPF supports multiple authentication mechanisms, between the various regions and allow different authentication mechanisms. OSPF link state algorithm for use in a broadcast network (e.g., Ethernet) is optimized to take advantage of the hardware capabilities as much as possible to transmit the broadcast link-state packets. Typically link state topology algorithm in a node represents a router. If K routers are connected to the Ethernet link status at the time of the broadcast, on the K router packet will reach a square K. For this purpose, OSPF topology graph allows a node representative of a broadcast network. All router sends link-state packets on each broadcast network, link status report of the network router.