carrier-delay
To delay the processing of hardware link down notifications, use the
carrier-delay
command in interface
configuration mode.
Note
•
The
carrier-delay
command is active only when both
up
and
down
are configured from the host.
•
If this configuration is not used, the default value is determined by the underlying driver, and may
vary depending on whether auto-negotiation is enabled. The default value is chosen to provide enough
time for the hardware link to stabilize after state change and to protect the system from excessive
link flaps.
•
If a value of 0 is set, carrier-delay is disabled in that direction.
•
The range of carrier-delay on access port of ASR 9000v is 1 to 60000 msec. If a value of 0 is set,
the default value of 100 msec is applied. A value greater than 60000 msec will be ignored and
show
interfaces
output will display the previously configured msec.
•
Both
up
and
down
must be set to the same value. If the values are different, the smaller value will
be set for both
up
and
down
configuration.
carrier-delay
{
down milliseconds
[
up milliseconds
]|
up milliseconds
[
down milliseconds
]}
Syntax Description
Length of time, in milliseconds, to delay the processing of hardware link down
notifications. Range is from 0 through 2147483648.
down milliseconds
Length of time, in milliseconds, to delay the processing of hardware link up
notifications. Range is from 0 through 2147483648.
up milliseconds
Command Default
No carrier-delay is used, and the upper layer protocols are notified as quickly as possible when a physical
link goes down.
Command Modes
Interface configuration
Command History
Modification
Release
The default value used when there is no carrier-delay configuration
changed from 0 to being defined by each driver.
Release 3.9.0
The range for both down and up was increased to 0 through 2147483648.
Release 4.2.0
This command was introduced.
Release 3.7.2
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
77
Ethernet Interface Commands on the Cisco ASR 9000 Series Router
carrier-delay