carrier-delay

To set the carrier delay on a serial interface, use the carrier-delay command. To return to the default carrier delay value, use the no form of this command.

carrier-delay { delay-seconds | msec milliseconds }

no carrier-delay

Syntax Description

delay-seconds
Time, in seconds, to wait for the system to change states. Enter an integer in the range 0 to 60.
msec
Specifies the delay time in milliseconds.
milliseconds
Time, in milliseconds, to wait for the system to change states. Enter an integer in the range 0 to 1000.

Command Default

None

Command Modes

Interface configuration mode

Command History

Release
Modification
5.1(3)N1(1)
This command was introduced.

Usage Guidelines

You can use this command on a VLAN interface.

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. Therefore, a large carrier delay timer results in fewer link-up/link-down events being detected. Setting the carrier delay time to 0 means that every link-up/link-down event is detected.

This command does not require a license.

Examples

This example shows how to change the carrier delay to 10 seconds:

switch# configure terminal
switch(config)# interface vlan 5
switch(config-if)# carrier-delay 10
switch(config-if)#
 

This example shows how to revert to the default carrier delay value:

switch# configure terminal
switch(config)# interface vlan 5
switch(config-if)# no carrier-delay
switch(config-if)#
 

Related Commands

Command
Description
show running-config interface
Displays the running configuration information for an interface.