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Hierarchy Level


Configure timestamping of the IEEE 1588 event packets at the physical layer. Timestamping the packet at the physical layer, also known as PHY timestamping, eliminates the noise or the packet delay variation (PDV) that is introduced by the Packet Forwarding Engine.

By default PHY timestamping is disabled.

On Junos EVO platforms, PHY timestamping is enabled by default and the phy-timestamping configuration option is unavailable.


MX104 routers and the MPC5E and MPC6E line cards do not support PHY timestamping in WAN PHY mode. If the interface framing is changed from LAN PHY mode to WAN PHY mode or WAN PHY mode to LAN PHY mode on MX104, MPC5E, or MPC6E, you must reboot the MX104 router or the MPC5E and MPC6E line cards. For PHY timestamping to work for MX104 routers and the MPC5E and MPC6E line cards, the packet forwarding engine must come up in LAN PHY mode after a reboot.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 17.1R1.