OSPF Working

The OSPF Hierarchy (#) OSPF is a hierarchical system that separates an Autonomous System into individual areas. OSPF traffic can either be intra-area (within one area), inter-area (between separate areas), or external (from another AS). OSPF routers build a Topology Database of all links within their area, and all routers within an area will have...

OSPF Network Types

(#) OSPF’s functionality is different across several different network topology types. OSPF’s interaction with Frame Relay will be explained in another section Broadcast Multi-Access It indicates a topology where broadcast occurs. Examples include Ethernet, Token Ring, and ATM. • OSPF will elect DRs and BDRs. • Traffic to DRs and BDRs is multicast to 224.0.0.6. Traffic...

OSPF LSA Types

Summary The word LSA stands for Link state Advertisement, which holds Topology information LSA are held in LSDB i.e. Link State DataBase, LSA are identified by OSPF Router ID of Advertising Router. LSDB  OSPF Speaking routers shares LSA information with neighboring routers, once LSA's are shared, they get every link information in that particular AS...

OSPF AREAS

Summary An OSPF network is divided into areas that are logical groupings of hosts and networks. An area includes its connecting router having interfaces connected to the network. Each area maintains a separate link state database whose information may be summarized towards the rest of the network by the connecting router. Thus, the topology of an area...