Specifications

IP Switching Commands
ip cache-invalidate-delay
ISW-32
Cisco IOS IP Switching Command Reference
May 2008
ip cache-invalidate-delay
To control the invalidation rate of the IP route cache, use the ip cache-invalidate-delay command in
global configuration mode. To allow the IP route cache to be immediately invalidated, use the no form
of this command.
ip cache-invalidate-delay [minimum maximum quiet threshold]
no ip cache-invalidate-delay
Syntax Description
Defaults minimum: 2 seconds
maximum: 5 seconds, and 3 seconds with no more than zero invalidation requests
Command Modes Global configuration
Command History
Usage Guidelines After you enter the ip cache-invalidate-delay command all cache invalidation requests are honored
immediately.
Caution This command should only be used under the guidance of technical support personnel. Incorrect settings
can seriously degrade network performance. The command-line-interface (CLI) will not allow you to
enter the ip cache-invalidate-delay command until you configure the service internal command in
global configuration mode.
The IP fast-switching and autonomous-switching features maintain a cache of IP routes for rapid access.
When a packet is to be forwarded and the corresponding route is not present in the cache, the packet is
process switched and a new cache entry is built. However, when routing table changes occur (such as
when a link or an interface goes down), the route cache must be flushed so that it can be rebuilt with
up-to-date routing information.
minimum (Optional) Minimum time (in seconds) between invalidation request and
actual invalidation. The default is 2 seconds.
maximum (Optional) Maximum time (in seconds) between invalidation request and
actual invalidation. The default is 5 seconds.
quiet (Optional) Length of quiet period (in seconds) before invalidation.
threshold (Optional) Maximum number of invalidation requests considered to be quiet.
Release Modification
10.0 This command was introduced.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
in a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.