What topology is OSPF?

What topology is OSPF?

OSPF [1] is a link state routing protocol. With link state protocols, each router within the domain discovers and builds a complete and consistent view of the network topology as a directed graph. Each router represents a node in the graph, and each link between neighboring routers represents a unidirectional edge.

How does OSPF divide up a network?

Instead, OSPF divides networks into sub-domains called areas. An area is a logical collection of OSPF networks, routers, and links that have the same area identification. A router within an area only has to maintain a topological database for its assigned area, which reduces its database size.

What does OSPF area contain?

Explanation: An OSPF area contains one set of link-state information, although each router within the area will process that information individually to form its own SPF tree. OSPF process IDs are locally significant and are created by the administrator.

What is OSPF and BGP?

  Both OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol) are routing protocols that make routing decisions across the Internet. They represent a set of rules or algorithms that instruct network routers on how to communicate with each other, so they can redirect traffic to the best path.

Is OSPF distance vector?

OSPF is not a distance-vector protocol like RIP, but a link-state protocol with a set of metrics that can be used to reflect much more about a network than just the number of routers encountered between source and destination. In OSPF, a router attempts to route based on the “state of the links.”

What are the components of OSPF?

The following are the important components of an OSPF network:

• Areas.
• Area Border Routers.
• Backbone Areas.
• AS Boundary Routers.
• Stub Areas.
• Not-So-Stubby Areas.
• Totally Stubby Area.
• Transit Areas.

Why is OSPF divided into areas?

In OSPF, a single autonomous system (AS) can be divided into smaller groups called areas. This reduces the number of link-state advertisements (LSAs) and other OSPF overhead traffic sent on the network, and it reduces the size of the topology database that each router must maintain.