results in higher stability of recovered clock. The PHY timestamping on ACX updates the
correction field of the packet. ACX supports PHY timestamping in ordinary clock and
boundary clock modes.
NOTE: PHY timestamping is supported only on ACX500 line of routers.
The following points need to be considered while configuring PHY timestamping in ACX
routers:
•
PHY timestamping is enabled or disabled on all the PHYs. You cannot selectively
enable or disable PHY timestamping on a particular interface.
•
When PHY timestamping is enabled, the transparent clock functionality is also enabled.
NOTE: The PHYs on ACX do not support transparent clock functionality for
PTP-over-MPLS. You should not enable transparent clock or PHY
timestamping if PTP is transported over MPLS.
In ACX2000 router, the transparent clock operation is not supported on the
10-Gigabit Ethernet port.
To enable PHY timestamping on ACX routers, configure clock-mode (ordinary clock or
boundary clock) along with the transparent-clock CLI statement at the [edit protocols
ptp] hierarchy.
[edit protocols ptp]
user@host# set clock-mode (boundary | ordinary)
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.
•
Enabling PHY Timestamping for Ordinary Clock Slave on page 271
•
Enabling PHY Timestamping for Boundary Clock on page 272
•
Enabling PHY Timestamping for Grandmaster Clock on page 272
Enabling PHY Timestamping for Ordinary Clock Slave
The following procedure enables you to configure PHY timestamping for ordinary clock
slave in ACX:
1. Configure the clock mode as ordinary.
[edit protocols ptp]
user@host# set clock-mode ordinary
271Copyright © 2017, Juniper Networks, Inc.
Chapter 9: Configuring Timing and Synchronization
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