Developing Link State Packets
When Information needed for exchange is collected, a router then builds a packet containing all the data. The packet starts with the identity of the sender, followed by a sequence number and age, and a list of neighbors. For each neighbor, the delay to that neighbor is given. Building a link state packet is usually easy, the complex part is determining when to build them. One way to reduce this problem is to build them periodically, that is, at regular intervals, or when some significant event occurs, such as a line or neighbor going down or coming back up again, or changing its properties appreciatively.
A major procedure called flooding which is used for distributing link state algorithms throughout the routing domain can be implemented with link state packets. However, ordinary flooding may result in problems, because it generates exponential behavior. Smart flooding, on the other hand, recognizes link state packets appropriately.
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