T Commands

This chapter describes the Cisco NX-OS Routing Information Protocol (RIP) commands that begin with T.

timers basic

To adjust the Routing Information Protocol (RIP) network timers, use the timers basic command. To restore the default timers, use the no form of this command.

timers basic update invalid holddown flush

no timers basic

 
Syntax Description

update

Rate (in seconds) at which updates are sent. The range is from 5 to 4,294,967,295. The default is 30 seconds.

invalid

Interval of time (in seconds) after which a route is declared invalid; it should be at least three times the value of the update argument. A route becomes invalid when no updates refresh the route. The route then enters into a holddown state where it is marked as inaccessible and advertised as unreachable. However, the route is still used to forward packets. The range is from 1 to 4,294,967,295. The default is 180 seconds.

holddown

Interval (in seconds) during which routing information regarding better paths is suppressed; it should be at least three times the value of the update argument. A route enters into a holddown state when an update packet is received that indicates that the route is unreachable. The route is marked as inaccessible and advertised as unreachable. However, the route is still used to forward packets. When holddown expires, routes advertised by other sources are accepted and the route is no longer inaccessible. The range is from 0 to 4,294,967,295. The default is 180 seconds.

flush

Amount of time (in seconds) that must pass before the route is removed from the routing table; the interval specified should be greater than the sum of the invalid argument plus the holddown argument. If it is less than this sum, the proper holddown interval cannot elapse, which results in a new route being accepted before the holddown interval expires. The range is from 1 to 4,294,967,295. The default is 240 seconds.

 
Command Default

update : 30 seconds
invalid : 180 seconds
holddown : 180 seconds
flush : 240 seconds

 
Command Modes

Router address-family configuration mode

 
Command History

Release
Modification

6.0(2)N1(1)

This command was introduced.

 
Usage Guidelines

You can modify the basic timing parameters for RIP. These timers must be the same for all routers and servers in the network.

Note You can view the current and default timer values by using the show ip protocols command.

Examples

This example shows how to set updates to broadcast every 5 seconds. If Cisco Nexus 6000 does not hear from a router in 15 seconds (the invalid time), it declares the route as unusable. Cisco Nexus 6000 suppresses further information for an additional 15 seconds (the holddown time). At the end of the suppression period, Cisco Nexus 6000 flushes the route from the routing table.

switch(config)# router rip Enterprise
switch(config-router)# address-family ipv4 unicast
switch(config-router-af)# timers basic 5 15 15 30
switch(config-router-af)#
 

 
Related Commands

Command
Description

address-family

Enters address-family configuration mode.

copy running-config startup-config

Saves the configuration to the startup configuration file.

show ip rip

Displays a summary of RIP information for all RIP instances.