Command
Timers
Use
Changes the RIP timers associated with RIP on the router.
Syntax
Router(config-router)#timers basic <update interval> <invalid> <holddown> <flush> <sleep time>
Options
| <update interval> | Time between route updates |
| <invalid> | Time interval that determines that a route is down |
| <holddown> | Route is no longer used but is still held in routing table |
| <flush> | How long until route is removed from routing table |
| <sleep time> | The time between rip packets |
Example
For this example, rip timers are set on R1, R2, and R3 using the below commands.
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#router rip R1(config-router)#timers basic 15 45 60 85
R2#conf t Enter configuration commands, one per line. End with CNTL/Z. R2(config)#router rip R2(config-router)#timers basic 15 45 60 85
R3#conf t Enter configuration commands, one per line. End with CNTL/Z. R3(config)#router rip R3(config-router)#timers basic 15 45 60 85
To simulate what happens when a rip route is lost, int fa0/0 on R1 is shut down.
R1(config-router)#int fa0/0 R1(config-if)#shut
Now, after 41 seconds of R1 being down, the rip route is still active on R2.
R2(config-if)#do show ip route rip 1.0.0.0/32 is subnetted, 3 subnets R 1.1.1.1 [120/1] via 10.1.1.1, 00:00:41, FastEthernet0/0 R 1.3.3.3 [120/1] via 10.1.1.1, 00:00:41, FastEthernet0/0 R 1.2.2.2 [120/1] via 10.1.1.1, 00:00:41, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets R 3.3.3.3 [120/1] via 10.2.2.3, 00:00:02, FastEthernet1/0
45 seconds after shutting down R1’s int fa0/0, the status of the routes is set to “possibly down”.
R2(config)#do show ip route rip 1.0.0.0/32 is subnetted, 3 subnets R 1.1.1.1/32 is possibly down, routing via 10.1.1.1, FastEthernet0/0 R 1.3.3.3/32 is possibly down, routing via 10.1.1.1, FastEthernet0/0 R 1.2.2.2/32 is possibly down, routing via 10.1.1.1, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets R 3.3.3.3 [120/1] via 10.2.2.3, 00:00:06, FastEthernet1/0
90 seconds after, the route is lost.
R2(config)#do show ip route rip 3.0.0.0/32 is subnetted, 1 subnets R 3.3.3.3 [120/1] via 10.2.2.3, 00:00:05, FastEthernet1/0