Fortinet 100 user manual 123, Update, Invalid, Holddown, Flush

RIP configuration

Update	The time interval in seconds between sending routing table updates. The
	default is 30 seconds.
Invalid	The time interval in seconds after which a route is declared invalid. Invalid
	should be at least three times the value of Update. A route becomes invalid
	when there is an absence of updates that refresh the route. The route then
	enters holddown. The route is marked inaccessible and advertised as
	unreachable. However, the route is still used for forwarding packets. The
	default is 180 seconds.
Holddown	The time interval in seconds during which routing information regarding
	better paths is suppressed. Holddown should be at least three times the
	value of Update. A route enters into a holddown state when an update packet
	is received that indicates the route is unreachable. The route is marked
	inaccessible and advertised as unreachable and is no longer used for
	forwarding packets. When holddown expires, the route can be flushed from
	the routing table. The default is 180 seconds.
Flush	The amount of time in seconds that must pass before a route is removed
	from the routing table. The value for Flush should be greater than the value
	for Invalid. If the value for Flush is less than the value for Invalid, the proper
	holddown interval cannot elapse, which results in a new route being
	accepted before the holddown interval expires. The default is 240 seconds.

7Select Apply to save your changes.

Figure 1: Configuring RIP settings

FortiGate-100 Installation and Configuration Guide 123