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Distance Vector Routing Timers

Networking Topics > Routing Protocols > Distance Vector Routing Timers

Route Update Timer – This is the amount of time the router waits before sending out it’s entire routing table out every enabled interface that has RIP routing protocol running.

Route Invalid Timer – If updates for a particular route have not been received in this time, then the route becomes invalid. It will then distribute this knowledge in it’s own routing update.

Route Flush Timer – After this amount of time, without a route update, a route is removed from a routing table. The router notifies it’s peers that the route will be removed before it’s removal, hence the flush timer has to allow significant time for this communication to happen.

Routing Timer Comparison Table

Routing Protocol	Route Update Timer	Route Invalid Timer	Route Hold-down Timer	Route Flush Timer
RIP	30 sec	90 sec		240 sec
IGRP	90 sec	3 x update	3 x update + 10 sec	7 x update

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