![]() ![]() Hosts and other devices uninterested in the routing updates will simply drop the packets. ![]() Neighboring routers speaking the same routing protocol will hear the broadcasts and take appropriate action. ![]() The simplest is to send the updates to the broadcast address (in the case of IP, 255.255.255.255). When a router first becomes active on a network, how does it find other routers and how does it announce its own presence? Several methods are available. For this reason, distance vector routing is said to use hop-by-hop updates. A distance vector routing protocol sends its updates to neighboring routers and depends on them to pass the update information along to their neighbors. In the context of routers, neighbors always means routers sharing a common data link. At issue here is the fact that if updates are sent too frequently, congestion may occur if updates are sent too infrequently, convergence time may be unacceptably high. This period typically ranges from 10 seconds for Apple Talk’s RTMP to 90 seconds for Cisco’s IGRP. Periodic updates means that at the end of a certain time period, updates will be transmitted. The name distance vector is derived from the fact that routes are advertised as vectors of (distance, direction), where distance is defined in terms of a metric and direction is defined in terms of the next-hop router.Ĭharacteristics of Distance Vector Routing Protocols: –Ī typical distance vector routing protocol uses a routing algorithm in which routers periodically send routing updates to all neighbors by broadcasting their entire route tables. ![]()
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