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OSPF (Open Shortest Path First) OSPF Area Types and Accepted LSAs

OSPF Area Types In the previous articles, we have generally talked about some OSPF area types. These are backbone area and standard area. But there are some other specific areas in OSPF design. These specific area types are stub area, NSSA(Not So Stubby Area), Totally Stubby Area and Totally NSSA. Let’s check these areas one […]

OSPF LSA Types • Router LSA (Type 1) : For only internal routers in a specific area. Lists router neighbors and their costs. Can not pass throught the ABR to other areas. • Network LSA (Type 2) : Advertised only from DR and contains all the routers that is its adjacent on the segment. Can […]

OSPF (Open Shortest Path First) Packet Types

OSPF Packet Types There are five types of packets used in OSPF. These are : OSPF (Open Shortest Path First) Packet Types In OSPF header, the following packet types are mentioned with the above numbers in the message type field. OSPF Header OSPF (Open Shortest Path First) Header You can check the OSPF packets with […]

OSPF (Open Shortest Path First) Neighbourship States, OSPF Adjacency

OSPF Adjacency Routers establish OSPF adjacency to use OSPF. From the beginning of the establishment to the full adjacency, there are some states. These states are mentioned below: OSPF (Open Shortest Path First) Neighbourship States • Down • Init : Hello packet received without Router ID. • 2-Way : Bi-directional communication is established by Hellos. […]

Routing with OSPF – Part 1

Archived in the category: Cisco, OSPF, Routing
Posted by gokhankosem on 01 Jan 15 - 1 Comment
OSPF (Open Shortest Path First) Router Types, Routing with OSPF

Routing with OSPF OSPF(Open Shortest Path First) is a link-state routing protocol. Basically link-state protocols are the ptotocols,in which all the nodes construct its topology table and independently calculates the next hope. But in the other routing protocol class, in distance vektor protocols, nodes needs a neighbor to inform about this changes. OSPF uses Dijsktra […]

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