Users Guide

● Priority1—Has the highest preference in the list of attributes used for master clock device selection.
● Priority2—Has the fifth preference in the list of attributes 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
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 44. 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.
The following table describes the system clock behavior depending on whether you choose PTP or NTP as the system time
source:
Table 45. System clock behavior
System time settings/time source System clock behavior
When PTP is the system time source:
○ You cannot configure the system as an NTP client.
○ If you configure the PTP clock and it is phase locked,
PTP sets the time.
○ If you do not configure the PTP clock and it is not phase
locked, the free-running system clock sets the time.
When NTP is the system time source: NTP client sets the system time. Even if the PTP clock runs
on the system, PTP does not set the system time.
When you configure NTP as a server: NTP provides the system clock. PTP or NTP can set the
system clock.
System management 201