Ieee 1588 Precision Time Protocol (Ptp); Enabling/Disabling Ptp Time Stamping - Alcatel-Lucent OmniSwitch 9900 Series Network Configuration Manual

Configuring Ethernet Ports

IEEE 1588 Precision Time Protocol (PTP)

The Precision Time Protocol (PTP) is a protocol used to synchronize clocks throughout a computer
network. On a local area network, it achieves clock accuracy in the sub-microsecond range, making it
suitable for measurement and control systems.
The PTP function requires a time source device and a time receiver device to provide the time
synchronization between the devices. The time source is called master and time receiver is known as
slave. Apart from this master and slave clock devices, there are intermediate switches in the network
through which the packets would be transmitted. On transmitting through these devices, a transmission
delay would be introduced on each of the switches placed between the master and the slave. To maintain
the accuracy of time synchronization between the master and the slave, it is important to take into
consideration these transmit times taken by the PTP frames when passing along the intermediary nodes.
The intermediate switches must have the ability to support PTP and thereby update the link and/or
residency time of frames in these switches - a concept knows as transparent clocking. There are two types
of transparent clocks, end-2-end transparent clock and peer-2-peer transparent clock.
OmniSwitch supports one step End-2-End transparent clock as defined in IEEE 1588 v2 Precision Time
Protocol standard (supports both 1588v1/v2 transparent clock).

Enabling/Disabling PTP Time Stamping

The interfaces ptp admin-state
on the switch, and set the internal priority for the incoming PTP packet.
-> interfaces ptp admin-state enable
-> interfaces ptp admin-state disable
The below command sets the internal priority for the incoming PTP packet as 4.
-> interfaces ptp admin-state enable priority 4
To set the internal priority to the default value 7, use the default keyword.
-> interfaces ptp admin-state enable priority default
Use show interfaces ptp config
OmniSwitch AOS Release 8 Network Configuration Guide
command can be used to enable or disable IEEE 1588 PTP time stamping
command to view the current PTP status on the switch.
December 2017
IEEE 1588 Precision Time Protocol (PTP)
page 1-27