Setting the PTP Mode

To enable PTP on switch interfaces, set the PTP mode using the ptp mode command. PTP mode options include the following:

boundary - The device acts as a boundary clock and runs and participates in the best master clock algorithm.
disabled - Disables PTP, and the device forwards all PTP packets as normal traffic.
end-to-end transparent - The device acts as an end-to-end transparent clock, synchronizing all ports to a connected master clock and updating the time interval field of forwarded PTP packets using switch residence time.
peer-to-peer transparent - The device acts as a peer-to-peer transparent clock, synchronizing all ports to a connected master clock and updating the time interval field of forwarded PTP packets using switch residence time and inbound path delays.
generalized Precision Time Protocol (gPTP) - The device runs generalized Precision Time Protocol (gPTP), participating in the best master clock algorithm but also updating the interval field of forwarded PTP packets using switch residence time and inbound path delays.

To disable PTP globally on the switch, use the no or default forms of the ptp mode command.

Example

This command configures the device as a PTP boundary clock.

switch(config)# ptp mode boundary
switch(config)#

Enabling PTP on an Interface

To enable PTP on a specific interface on the device, use the ptp enable command.

Example

This command enables PTP on interface ethernet 5.

switch(config)# interface ethernet 5
switch(config-if-Et5)#ptp enable

Setting the PTP Priority

To set the priority 1 value, use the ptp priority1 command. Lower values take precedence.

This command configures the priority 1 value of 120 to use when advertising the clock.

switch(config)# ptp priority1 120
switch(config)#

To set the priority 2 value for the clock, use the ptp priority2 command.

This command configures the priority 2 value of 128.

switch(config)# ptp priority2 128
switch(config)#

Configuring the Source IP

To set the source IP address for all PTP packets, use the ptp source command.

Example

This command configures the source IP address of 10.0.2.1 for all PTP packets.

switch(config)# ptp source ip 10.0.2.1
switch(config)#

This command configures the source IP address of 2001:db8:ac10:fe01:: for all PTP packets.

switch(config)# ptp source ip 2001:db8:ac10:fe01::
switch(config)#

Configuring PTP Monitoring

PTP Monitoring records PTP information, including the offset from the master, mean path delay, and skew values, which you view using a show command. PTP Syslog messages generate the metrics with threshold values configured on the switch when enabled. EOS enables PTP Monitoring by default.

Enabling and Disabling PTP Monitoring

Use the ptp monitor command to enable PTP monitoring on the device. The no form of the command disables PTP monitoring and clears all of the recorded PTP data.

Example

This command disables PTP monitoring and clears all recorded PTP data from the switch.

switch(config)# no ptp monitor

Configuring the Offset-from-master Threshold

The offset is the difference in nanoseconds between master and slave time. Use the ptp monitor threshold offset-from-master command to specify the offset-from-master threshold in nanoseconds. EOS generates a Syslog message if the most recently calculated time offset from the PTP master occurs outside the configured range. The maximum offset threshold is one second. The no form of the command clears the threshold value and prevents further Syslog messages from generating for this parameter.

Example

This command sets an offset-from-master threshold value of 500 nanoseconds.

switch(config)# ptp monitor threshold offset-from-master 500

Configuring the Mean-path-delay Threshold

Mean path delay is the mean time in nanoseconds PTP packets take to travel between master and slave. Use the ptp monitor threshold mean-path-delay command to specify the mean-path-delay threshold in nanoseconds. EOS generates a Syslog message if the value of the most recently calculated mean path delay becomes greater than or equal to this threshold. The maximum mean-path-delay threshold is one second. The no form of the command clears the threshold value and prevents further Syslog messages from generating for this parameter.

Note: Mean path delay is always non-negative.

Example

This command sets a mean-path-delay threshold value of 2000 nanoseconds.

switch(config)# ptp monitor threshold mean-path-delay 2000

Configuring the Skew Threshold

PTP skew is the clock frequency difference between master and slave. Use the ptp monitor threshold skew command to configure the value of the skew-threshold percentage. A Syslog message generates if the value of the most recently calculated skew does not fall within the range (1/(1+<threshold>), 1*(1+<threshold>)). Skew threshold percentage represents a double precision (16 digit) real number ranging from 0 (0%) to 10 (1000%). The no form of the command clears the threshold value and prevents further Syslog messages from generating for this parameter.

Example

This command sets a skew threshold value of 5 (500%).

switch(config)# ptp monitor threshold skew 5

Setting the PTP Announce Interval

To set the interval at which an interface sends PTP announce messages, use the ptp announce interval command. The interval is measured in log seconds. This value also affects the timeout interval.

This command configures the interval between PTP announcement messages on interface ethernet 5 to 4 seconds.

switch(config)# interface ethernet 5
switch(config-if-Et5)# ptp announce interval 2
switch(config-if-Et5)#

Setting the PTP Timeout Interval

To set the timeout multiplier for an interface, use the ptp announce timeout command. The timeout multiplier is the number of announcement intervals that the interface will wait without receiving a PTP announcement before a timeout occurs; values range from 2 to 255. The default multiplier is 3, which results in a 6-second timeout interval when the announcement interval is set to the default of 2 seconds.

This command sets timeout multiplier for the interface to 5; since the announcement interval has just been set to 2 (4 seconds), this means the interface will time out if it doesn’t receive a PTP announcement for 20 seconds.

switch(config-if-Et5)# ptp announce timeout 5
switch(config-if-Et5)#

End of Support

EOS 4.33.2F User Manual - Setting the PTP Mode

Setting the PTP Mode

EOS 4.33.2F User Manual - Enabling PTP on an Interface

Enabling PTP on an Interface

Example

EOS 4.33.2F User Manual - Configuring the PTP Domain

Configuring the PTP Domain

EOS 4.33.2F User Manual - Configuring the Offset Hold Time

Configuring the Offset Hold Time

EOS 4.33.2F User Manual - Setting the PTP Priority

Setting the PTP Priority

EOS 4.33.2F User Manual - Configuring the Source IP

Configuring the Source IP

EOS 4.33.2F User Manual - Configuring the TTL for PTP Packets

Configuring the TTL for PTP Packets

EOS 4.33.2F User Manual - Configuring PTP Monitoring

Configuring PTP Monitoring

Enabling and Disabling PTP Monitoring

Configuring the Offset-from-master Threshold

Configuring the Mean-path-delay Threshold

Configuring the Skew Threshold

EOS 4.33.2F User Manual - Setting the PTP Announce Interval

Setting the PTP Announce Interval

EOS 4.33.2F User Manual - Setting the PTP Timeout Interval

Setting the PTP Timeout Interval