Cisco ME 3600X, Command Reference Manual

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Cisco ME 3800X and ME 3600X Switch Command Reference
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Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
network-clock-select hold-timeout
network-clock-select hold-timeout
To configure the time after which the switch moves from the holdover state to the free-run state for
system timing, use the
network-clock-select hold-timeout command in global configuration mode. To
return to the default value, use the no form of this command.
network-clock-select hold-timeout { value | infinite }
no network-clock-select hold-timeout
Syntax Description
Defaults The default holdout time is infinite.
Command Modes Global configuration
Command History
Usage Guidelines If there is no reliable clock source available, the switch goes into holdover mode and replays the saved
clock from the last source.
You can configure a holdout time only if you enter the ql-enabled rep-segment command in global
configuration mode to configure the Resilient Ethernet Protocol (REP) workaround for resiliency and to
avoid timing loops.
When the configured holdout time expires, the switch goes into free-run state, where the timing clock is
internal to the switch.
If you do not configure the REP workaround, the holdout time in a priority-based configuration is
infinite.
Examples
This example shows how to set the switch to wait for 10,000 seconds after no reliable clock source is
available and use the saved clock information:
Switch(config)# network-clock-select hold-timeout 10000
Switch(config)# exit
value Sets the time in seconds before the switch changes to a different clock input.
The range is 0 to 86,400 seconds. This can be selected only when Resilient
Ethernet Protocol (REP) quality level is enabled.
infinite Sets the time to infinite. The switch continues to use the existing clock input
information forever. This is the default.
Release Modification
12.2(52)EY This command was introduced.