Configure Precision Time Protocol (PTP) Clocking

In a distributed network, you can configure Precision Time Protocol (PTP) timeTransmitter clocks and timeReceiver clocks to help synchronize the timing across the network. The synchronization is achieved through packets that are transmitted and received in a session between the timeTransmitter clock and the timeReceiver clock or clock client.

1. In configuration mode, go to the [edit protocols ptp] hierarchy level.
2. Specify the clock as a boundary or ordinary clock. The boundary option signifies that the clock can be both a timeTransmitter clock and a timeReceiver clock. The ordinary option signifies that the clock is a timeReceiver clock.
3. (Optional) Enable PHY Timestamping. The PHY timestamping is disabled by default.
   Note: The above command is not applicable on ACX500 and ACX2000. For these platforms, enter set e2e-transparent.
4. (Optional) Configure the PTP domain with values from 0 through 127. The default value is 0.
5. (Optional) Specify the DiffServ code point (DSCP) value (0 through 63) for all PTP IPv4 packets originated by the router. The default value is 56.
6. Specify the timeTransmitter clock parameters.

   For details about configuring the timeTransmitter clock parameters, see .

7. (Optional) Configure the priority value of the clock (0 through 255). This value is used in selecting the best timeTransmitter clock. The priority1-value is advertised in the timeTransmitter clock’s announce message to clock clients. The default value is 128.
8. (Optional) Configure the tie-breaker in selecting the best timeTransmitter clock (0 through 255). The priority2 value differentiates and prioritizes the timeTransmitter clock to avoid confusion when the priority1-value is the same for different timeTransmitter clocks in a network. The default value is 128.
9. Specify the PTP timeReceiver clock parameters.

   For information about configuring the timeReceiver clock options, see

10. (Optional) Enable unicast negotiation. Unicast negotiation is a method by which the announce, synchronization, and delay response packet rates are negotiated between the timeTransmitter clock and the clock client before a PTP session is established.
    Note:

    Unicast negotiation, when enabled, does not allow you to commit packet rate–related configurations.

    For configuration values, see PTP Timers and Log Mean Interval (LMI).