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OSPF Multiarea Protocol


Open Shortest Path First (OSPF) Basics

Open Shortest Path First (OSPF) It is an open standard routing protocol that’s been implemented by a wide variety of network vendors. By using the Dijkstra algorithm. A shortest path tree is constructed, and then the routing table is populated with the resulting best paths.

OSPF provides the following features:

  • Consists of areas and autonomous systems
  • Minimizes routing update traffic
  • Allows scalability
  • Supports VLSM/CIDR
  • Has unlimited hop count
  • Allows multi-vendor deployment (open standard)
OSPF areas

An OSPF area is a grouping of contiguous networks and routers. All routers in the same area share a common Area ID. Because a router can be a member of more than one area at a time, the Area ID is associated with specific interfaces on the router. This would allow some interfaces to belong to area 1 while the remaining interfaces can belong to area 0. All of the routers within the same area have the same topology table.



R1#show run | sec router ospf

routerospf 1
network 1.1.1.1 0.0.0.0 area 0
network 10.1.12.0 0.0.0.255 area 0


R2#show run | sec router ospf

routerospf 1
network 2.2.2.2 0.0.0.0 area 0
network 10.1.12.0 0.0.0.255 area 0
network 10.1.23.0 0.0.0.255 area 1


R3#show run | sec router ospf

routerospf 1
network 3.3.3.3 0.0.0.0 area 0
network 10.1.23.0 0.0.0.255 area 1








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