OSPF (Open Shortest Path First)
Introduction: What Is OSPF?
OSPF stands for Open Shortest Path First, an open standard link-state routing
protocol. This
routing protocol was built by a committee,which is why it is an open standard. The word open
means that anyone can read the rules or standard and write an application. The routing protocol
as such belongs to no one,
but to everyone . . . .
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Key Attributes of OSPF.
OSPF is designed to offer the greatest flexibility for every situation. As an open standard, it is
required to offer interoperability in conjunction with this flexibility, while allowing the network
to grow. These requirements make OSPF a highly complex routing protocol.
To understand . . . .
Download ISO 9000 Standards from ANSI
Path Selection Between Routing Protocols
Clearly there are many IP routing protocols from which to choose. It is better if a single routing
protocol can be chosen because this gives a consistency that relates directly to the strength of
the network. It complicates the network to have more than a single routing protocol attempting . . . .
Convergence
Convergence occurs when all the routers in the routing domain agree on the routes that are
available. Convergence time is the time that it takes for every router’s routing table to
synchronize after there has been a change in the network topology.
It is important to ensure that the time taken is as short as possible because while the routers
disagree on the available networks, they cannot route data correctly or efficiently.
Each routing protocol has chosen a different method of updating the routing table. This affects
convergence time. Some new concepts are introduced in the following comparison in protocol
convergence methods. This is simply to show the relative merits of each approach . . . .