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Configure PTP Transparent Clock

ACX Series routers supports transparent clock functionality. A Precision Time Protocol (PTP) Transparent clock measures the residence time of PTP packets as they pass through router. This residence time is added to the Correction Field of the PTP packet.

Note:

Starting in Junos OS Release 17.1 onwards, to configure transparent clock, include the e2e-transparent CLI command at the [edit protocols ptp] hierarchy level. Prior to Junos OS Release 17.1, to configure transparent clock, include the transparent-clock CLI command at the [edit protocols ptp] hierarchy level.

In a distributed network, you can configure transparent clock for Precision Time Protocol (PTP) for synchronizing the timing across the network. Junos OS supports the e2e-transparent CLI statement at the [edit protocols ptp] hierarchy level to configure transparent clock for Precision Time Protocol (PTP).

The following points need to be considered while configuring a PTP transparent clock in ACX routers:

  • Domain numbers—Transparent clock functionality would compute the residence time for PTP packets belonging to all domains.

  • PTP-over-MPLS—Transparent clock functionality do not support PTP carried over MPLS in ACX routers.

The PTP transparent clock functionality is supported on PTP-over-IP and PTP-over-Ethernet (PTPoE).

Note:

  • ACX routers do not support PTPoE over VLANs when it works in ordinary clock or boundary clock mode.

  • When the IGMP snooping-enabled routers and switches that are configured with PTP Transparent clock fail to perform the IGMP snooping, use the static IGMP configuration to forward the PTP traffic.

To configure a PTP transparent clock:

  1. Configure the clock mode:
  2. Configure the transparent clock:
  3. (Optional) To configure the syntonized-end-to-end (E2E) transparent clock for Precision Time Protocol (PTP) use the command provided below. Please note that SyncE must be enabled before enabling syntonized transparent clock.