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Two additional timers are also associated with RIP updates,
the timeout timer and the garbage-collection timer. When a new route
is installed in the routing table, the timeout timer is initialized
to zero and begins to count. Every time a RIP message containing the
route is received, the timeout timer is reset to zero. If a RIP
message containing the route is not received for 180 seconds, the
metric for the route is set to 16 and a garbage-collection timer for
the route is started. If 120 seconds pass without receiving the
route in a RIP message, the route is removed from the routing table.
If a message is received containing the route before the
garbage-collection timer reaches 120, the timer is cleared and the
route is installed in the routing table. |
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