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carrier-delay (tracking)
To enable Enhanced Object Tracking (EOT) to consider the carrier-delay timer when tracking the status of an interface, use the carrier-delay command in tracking configuration mode. To disable EOT from considering the carrier-delay timer when tracking the status of an interface, use the no form of this command.
Command Default
EOT does not consider the carrier-delay timer configured on an interface when tracking the status of the interface.
Usage Guidelines
If a link fails, by default there is a two-second timer that must expire before an interface and the associated routes are declared down. If a link goes down and comes back up before the carrier delay timer expires, the down state is effectively filtered, and the rest of the software on the switch is not aware that a link-down event occurred. You can configure the carrier-delay seconds command in interface configuration mode to extend the timer up to 60 seconds.
When Enhanced Object Tracking (EOT) is configured on an interface, the tracking may detect the interface is down before a configured carrier-delay timer has expired. This is because EOT looks at the interface state and does not consider the carrier-delay timer.
Examples
The following example shows how to configure the tracking module to wait for the interface carrier-delay timer to expire before notifying clients of a state change:
Router(config)# track 101 interface ethernet1/0 line-protocol Router(config-track)# carrier-delayRelated Commands
Command
Description
carrier-delay
Sets the carrier delay on an interface.
show track
Displays information about objects that are tracked by the tracking process.
track interface
Configures an interface to be tracked and to enter tracking configuration mode.
track ip route
Tracks the state of an IP route and enters tracking configuration mode.
track ip sla
Tracks the state of a Cisco IOS SLAs operation and enters tracking configuration mode.
track list
Specifies a list of objects to be tracked and the thresholds to be used for comparison.
track resolution
Specifies resolution parameters for a tracked object.
track timer
Specifies the interval that a tracking process polls a tracked object.
clear ip wccp
To remove IPv4 Web Cache Communication Protocol (WCCP) statistics (counts) maintained on the router for a particular service, use the clear ip wccp command in privileged EXEC mode.
Syntax Description
vrf vrf-name
(Optional) Specifies a virtual routing and forwarding (VRF) instance to associate with a service group.
service-number
(Optional) Number of the cache service to be removed. The number can be from 0 to 254.
web-cache
(Optional) Directs the router to remove statistics for the web cache service.
Command History
Release
Modification
11.1CA
This command was introduced for Cisco 7200 and 7500 platforms.
11.2P
Support for this command was added to a variety of Cisco platforms.
12.0(3)T
This command was expanded to be explicit about service using the web-cache keyword and the service-number argument.
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.
Cisco IOS XE Release 2.2
This command was integrated into Cisco IOS XE Release 2.2.
15.0(1)M
This command was modified. The vrf keyword and vrf-name argument were added.
12.2(33)SRE
This command was modified. The vrf keyword and vrf-name argument were added.
12.2(50)SY
This command was modified. The vrf keyword and vrf-name argument were added.
Cisco IOS XE Release 3.3SG
This command was integrated into Cisco IOS XE Release 3.3SG.
Cisco IOS XE 3.3SE
This command was implemented in Cisco IOS XE Release 3.3SE.
Usage Guidelines
Use the show ip wccp and show ip wccp detail commands to display WCCP statistics. If Cisco Cache Engines are used in your service group, the reverse proxy service is indicated by a value of 99.
Use the clear ip wccp command to clear the WCCP counters for all WCCP services in all VRFs.
default-state
To set the default state for a stub object, use the default-state command in tracking configuration mode. To reset the default state to its internal default state, use the no form of this command.
Command History
Release
Modification
12.4(2)T
This command was introduced.
12.2(31)SB3
This command was integrated into Cisco IOS Release 12.2(31)SB3.
12.2(33)SRB
This command was integrated into Cisco IOS Release 12.2(33)SRB.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
12.2(33)SXI
This command was integrated into Cisco IOS Release 12.2(33)SXI.
Cisco IOS XE 3.3SE
This command was implemented in Cisco IOS XE Release 3.3SE.
Usage Guidelines
Use the default-state command to set the default state of a stub object that has been created by the track stub command. The stub object can be tracked and manipulated by an external process, Embedded Event Manager (EEM).
EEM is a distributed, scalable, and customized approach to event detection and recovery offered directly in a Cisco IOS device. EEM offers the ability to monitor events and take informational or corrective action when the monitored events occur or when a threshold is reached. An EEM policy is an entity that defines an event and the actions to be taken when that event occurs.
delay (tracking)
To specify a period of time to delay communicating state changes of a tracked object, use the delay command in tracking configuration mode. To disable the delay period, use the no form of this command.
delay { up seconds | [ down seconds ] | up seconds | [ down seconds ] }
no delay { up seconds | [ down seconds ] | up seconds | [ down seconds ] }
Command History
Release
Modification
12.2(15)T
This command was introduced.
12.2(25)S
This command was integrated into Cisco IOS Release 12.2(25)B.
12.2(28)SB
This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA
This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH
This command was integrated into Cisco IOS Release 12.2(33)SXH.
Cisco IOS XE Release 2.1
This command was integrated into Cisco IOS XE Release 2.1.
15.3(3)M
This command was integrated into Cisco IOS Release 15.3(3)M.
Cisco IOS XE 3.3SE
This command was implemented in Cisco IOS XE Release 3.3SE.
Usage Guidelines
This command is available to all tracked objects.
If you specify, for example, delay up 10 down 30, then if the object state changes from down to up, clients tracking that object are notified after 10 seconds. If the object state changes from up to down, then clients tracking that object are notified after 30 seconds.
Examples
In the following example, the tracking process is tracking the IP-route threshold metric. The delay period to communicate the tracked object state changing to down is set to 30 seconds.
Router(config)# track 1 ip route 10.22.0.0/16 metric threshold Router(config-track)# threshold metric up 16 down 20 Router(config-track)# delay down 30