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When ospf adjacency is formed a router goes through several state changes before it becomes fully adjacent with its neighbor.
Read ospf and is is from link state. The required reading from ciscos website included mapping out many other types of lsas which are not directly relevant to the construction of the ospf graph within an area. All of this information is stored in the link state database lsdb. Link state advertisement lsa is a data packet which contains link state and routing information. Ospf is designed for scalability so some lsas are not flooded out on all interfaces but only on those that belong to the appropriate area.
Ospf being a link state protocol allows for every router in the network to know of every link and ospf speaker in the entire network. Ospf uses it share and learn network information. Only lsa 1 and lsa 2 are used to actually build the graph since the ospf area is the definition of the ospf link state domain. Every ospf router maintains a link state database lsdb.
This summarization is not on by default. The link state id of the type 2 lsa is the ip interface address of the dr. The states are down attempt init 2 way exstart exchange loading and full. It is defined as ospf version 2 in rfc 2328 1998 for ipv4.
Open shortest path first ospf is a link state routing protocol that is used to find the best path between the source and the destination router using its own shortest path first. Type 3 summary lsa. Ospf stores lsa in ladb with this sequence. Open shortest path first ospf is a routing protocol for internet protocol ip networks.
Those states are defined in the ospf rfc 2328 section 101. It uses a link state routing lsr algorithm and falls into the group of interior gateway protocols igps operating within a single autonomous system as. Ospf link state database external the following table is identical to the ospf lsdb table in format but contains only external link state advertisements. From this picture each router independently runs the shortest path first spf algorithm to determine the best path through the network.
Ospf is developed by internet engineering task force ietf as one of the interior gateway protocol igp ie the protocol which aims at moving the packet within. Next we cover ospf link state packet types used to exchange data between ospf routers. Every lsa has a sequence number. It communicates the routers local routing topology to all other local routers in the same ospf area.
This article covers basic ospf concepts and operationwe explain how ospf works how ospf tables are built on an ospf enabled router and their purpose neighbour table topology table routing table ospf areas and their importance. The link state advertisement lsa is a basic communication means of the ospf routing protocol for the internet protocol ip. Lsdb is collection of all lsas received by a router. Link state advertisement lsa link state database lsdb link state.
The purpose is to allow external lsas to be displayed once for the router rather than once in. The link state id of the type 3 lsa is the destination network number.
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