So the default RIP update timer is 30 seconds. Every 30 seconds the router blasts out its routing table to all of its directly connected neighbors. Then you have a holddown timer, during holddown, any routing information about a worse (or equivalent) hop count path is suppressed (held down). That is, RIP will not re-learn a route during this holddown period of 180 seconds. This allows time for "bad" routes to be removed from the routing table. In RIP, the default holddown is 3 times the update timer, or 180 seconds.
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