Instance-specific Configuration Options

Enhanced PTP User Guide (UG1602)

Document ID: UG1602
Release Date: 2023-04-07
Revision: 1.1 English

The following table shows the instance-specific configuration options for the crny sync module. These must be in a section labeled with the instance name.

Table 1. Instance-specific Configuration Options for the crny Sync Module
Option	Parameters	Description
priority	<number>	Relative priority of sync module instance.¹ Smaller values have higher priority. Default: 128.
sync_threshold	<number>	Threshold in nanoseconds of the offset from the clock source over a 60s period to be considered in sync (converged). Default: 10000000 ns. See also the `local_sync_threshold` option in Table 1.
ntp_poll_interval	<number>	Specifies how often the NTP daemon will be polled, in seconds. Default: 1.
control_script	<filename>	Specifies the path to a script which can be used to enable or disable `chronyd` clock control.
If the priority is specified in a generic section, outside of a specific (named) sync instance, the priority will apply to all sync modules of the same type. For example: `sync_module crny namedcrny1 namedcrny2 [crny] // this applies to all crny type sync module instances priority 128 [namedcrny1] // this applies only to this instance - and takes priority over any generic value priority 127 [namedcrny2] // this applies only to this instance - and takes priority over any generic value priority 126`