Fortinet 50A user manual Invalid, Holddown, Flush

RIP settings RIP configuration

Default Metric RIP uses the default metric to advertise routes learned from other routing protocols. Set Default Metric to a positive integer lower than 16 to advertise that metric for all routes learned from other routing protocols. The default setting for the Default Metric is 2.

Input Queue Change the depth of the RIP input queue. The higher the number, the deeper the input queue. Change the input queue depth to prevent loss of information from the routing table when you have a FortiGate unit sending at high speed to a router that cannot receive at high speed. The range is 0 to 1024. The default input queue depth is 50. A queue size of 0 means there is no input queue.

Output Delay Add a delay in milliseconds between packets in a multiple-packet RIP update. Add an output delay if you are configuring RIP on a FortiGate unit that could be sending packets to a router that cannot receive the packets at the rate the FortiGate unit is sending them. Output Delay can be from 8 to 50 milliseconds. The default output delay is 0 milliseconds.

5Change the following RIP timer settings, as required.

RIP timer defaults are effective in most configurations. You should only have to change these timers to troubleshoot network routing problems. All routers and access servers in the network should have the same RIP timer settings.

Update	The time interval in seconds between RIP 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.
	During the invalid interval, after the first update is missed and before the
	invalid timer expires, the route is marked inaccessible and advertised as
	unreachable; however, the route is still used for forwarding packets. The
	invalid interval allows for the loss of one or more update packets before RIP
	considers the route unusable. If RIP receives an update for a route, before
	the invalid timer expires, it resets the invalid timer to 0. The default for Invalid
	is 180 seconds.
Holddown	The time interval in seconds during which RIP ignores routing information for
	a route. Holddown should be at least three times the value Update.
	A route enters the holddown state when RIP receives an update packet
	indicating that a route is unreachable or when the invalid timer for the route
	expires. The holddown interval allows time for bad routing information to
	clear the network during network convergence. The route is marked
	inaccessible and advertised as unreachable and is no longer used for
	forwarding packets. The default for Holddown is 180 seconds.
Flush	The time in seconds that must elapse after the last update for a route before
	RIP removes the route from the routing table. Flush should be greater than
	the value of Invalid to allow the route to go into the holddown state. The
	default for Flush is 240 seconds.

6Select Apply to save the changes.

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