Configuring a 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.
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.
To configure a PTP transparent clock:
1. Configure the clock mode:
[edit protocols ptp]
user@host# set clock-mode (boundary | ordinary)
2. Configure the transparent clock:
[edit protocols ptp]
user@host# set e2e-transparent
3. (Optional) Enable PHY Timestamping. The PHY timestamping is disabled by default.
[edit protocols ptp]
user@host# set e2e-transparent
Configuring PHY Timestamping
The PHY timestamping refers to the timestamping of the IEEE 1588 event packets at the
1-Gigabit Ethernet and 10-Gigabit Ethernet PHY. Timestamping the packet in the PHY
Copyright © 2017, Juniper Networks, Inc.270
ACX Series Universal Access Router Configuration Guide
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