Routers that use distance vector periodically broadcast their entire routing table to its neighbours even if the network topology has not changed. These periodic updates are sent at regular intervals (normally 30 seconds for RIP and 90 seconds for IGRP).
This is achieved by means of local timer maintained in each router in the network, when the timer expires; a routing information update is sent (Graziani & Johnson, 2009) .
This is achieved by means of local timer maintained in each router in the network, when the timer expires; a routing information update is sent
Distance Vector protocol is mathematically based on Bellman-Ford algorithm. Because of the algorithm simplicity, it has been widely implemented in wide-range network areas such as IP routing and AppleTalk. (Zinin, 2002) .
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