Fortinet FortiGate 4000 - Manual (Page 168)

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Fortinet Inc.
RIP settings RIP configuration
5 Change 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.
6 Select Apply to save the changes.
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.
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.