Cisco IP Routing Protocols: Trouble Shooting Techniques (Charles River Media Networking/Security)

Open Shortest Path First (OSPF) ensures interoperability between routing devices manufactured by diverse vendors.

Link State Advertisement (LSA) is an OSPF packet containing source, destination, and routing information, which is advertised to all OSPF routers in a hierarchical area.

A designated router (DR) reduces the number of adjacencies formed in a broadcast network.

A backup designated router (BDR) acts as a standby for the DR on broadcast networks by collecting routing information updated from the adjacent OSPF routers and takes the role of a DR when the DR goes down.

Multi-access/broadcast networks are physical networks that support interconnection of more than two routers that can communicate directly.

A single area (SA) is a logical subdivision of the greater OSPF domain, grouping routers that run OSPF with identical topological databases.

A Totally Stubby Area (TSA) is a type of a nonstandard OSPF area that is used when few networks with limited connectivity are connected to the remaining network.

Four types of OSPF routers are Internal Router (IR), Area Border Router (ABR), Backbone Router (BR), and Autonomous System Boundary Router (ASBR).

The priority value is the primary parameter used in DR and BDR elections in an OSPF routing process.

In a loading state, the information exchange between the OSPF routers that have formed adjacency is finalized.

To prevent routing loops and sub-optimal routing in the network, configure redistribution into OSPF and between OSPF and another IGP.