Users Guide

● Priority1—Has the highest preference in the list of attributes that are used for master clock device selection.
● Priority2—Has the fifth preference in the list of attributes that are used for master clock device selection.
● LocalPriority—(Applicable only for the G.8275.1 profile) Determines the master clock device when two clocks are similar to
each other.
Supported platforms
OS10 supports PTP only on the following platforms:
● S4100-ON series: S4148F-ON, S4148T-ON, S4148FE-ON, S4148U-ON
● S5200-ON series: S5232F-ON, S5248F-ON, S5296F-ON, S5224F–ON
● Z9264F-ON
Standards compliance
OS10 complies with the following standards:
Table 33. Supported standards
Supported standards Description
G. 8273.2 Timing characteristics of telecom boundary clocks.
G. 8275.1 PTP telecom profile for phase and time synchronization with full timing support from the
network.
IEEE 1588-2008 IEEE standard for a precision clock synchronization protocol.
PTP installation scale and limits
The following table lists the verified scalability limits for PTP nodes with message rate (sync and delay request) of 16 pps.
Table 34. PTP scale and limits
Platform PTP peer slave sessions PTP peer master sessions Total number of sessions
S4100-ON series 36 4 40
● S5200F-ON series
● Z9264F-ON
120 8 128
Configuration notes
● The maximum number of supported PTP ports is 40.
● Maximum number of supported PTP unicast masters is eight.
● In a topology where a PTP device is connected to VLT primary and secondary nodes, configure PTP as an independent
boundary clock on both the VLT nodes.
NOTE:
○ Dell Technologies recommends enabling PTP on the VLT port-channel member interfaces and not on the VLT
port-channel interface.
○ Tagged PTP messages using the ptp vlan command are not supported on VLT port-channel member interfaces.
○ The unicast transport method is not supported on the VLT port-channel member interfaces.
● System time settings:
When you enable PTP as the system time source, PTP sets the system time. When you enable PTP on a system, the system
cannot act as an NTP client, but can act as an NTP server.
System management
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