Chapter 19
| Unicast Routing
Configuring the Routing Information Protocol
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Basic Timer Settings
Note:
The timers must be set to the same values for all routers in the network.
◆ Update – Sets the rate at which updates are sent. This is the fundamental timer
used to control all basic RIP processes. (Range: 5-2147483647 seconds;
Default: 30 seconds)
Setting the update timer to a short interval can cause the router to spend an
excessive amount of time processing updates. On the other hand, setting it to
an excessively long time will make the routing protocol less sensitive to
changes in the network configuration.
◆ Timeout – Sets the time after which there have been no update messages that
a route is declared dead. The route is marked inaccessible (i.e., the metric set to
infinite) and advertised as unreachable. However, packets are still forwarded on
this route. (Range: 90-360 seconds; Default: 180 seconds)
◆ Garbage Collection – After the timeout interval expires, the router waits for an
interval specified by the garbage-collection timer before removing this entry
from the routing table. This timer allows neighbors to become aware of an
invalid route prior to purging. (Range: 60-240 seconds; Default: 120 seconds)
Web Interface
To configure general settings for RIP:
1. Click Routing Protocol, RIP, General.
2. Select Configure Global from the Action list.
3. Enable RIP, set the RIP version used on unset interfaces to RIPv1 or RIPv2, set the
default metric assigned to external routes, set the maximum number of routes
allowed by the system, and set the basic timers.
4. Click Apply.
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