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Routing table updates occur periodically
or
when the topology in a distance vector protocol network changes. It is
important that a routing protocol be efficient in updating the routing
tables. As with the network discovery process, topology change updates
proceed systematically from router to router.
 Distance
vector algorithms call for each router to send its entire routing
table to each of its adjacent neighbors. The routing tables include
information about the total path cost as defined by the metrics and
the logical address of the first router on the path to each network
contained in the table.
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