•
The slave uses these timestamps to adjust its clock to the time of its master.
Clock Management
By default, Cisco NX-OS uses NTP to update the system clock. However, if the clock protocol property is
configured to PTP, PTP is allowed to update the system clock.
If PTP is enabled, NTP does not update the system time.
High Availability for PTP
Stateful restarts are supported for PTP. After a reboot or a supervisor switchover, the running configuration
is applied.
Licensing Requirements for PTP
PTP requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS
licensing scheme, see the Cisco NX-OS Licensing Guide.
Guidelines and Limitations for PTP
•
PTP operates only in boundary clock mode. End-to-end transparent clock and peer-to-peer transparent
clock modes are not supported.
•
PTP supports transport over User Datagram Protocol (UDP). Transport over Ethernet is not supported.
•
PTP supports only multicast communication. Negotiated unicast communication is not supported.
•
PTP is limited to a single domain per network.
•
All management messages are forwarded on ports on which PTP is enabled. Handling management
messages is not supported.
•
PTP is only configurable on switch ports. Configuring PTP on FEX ports is not supported.
•
PTP-capable ports do not identify PTP packets and do not time-stamp or redirect those packets unless
you enable PTP on those ports.
•
PTP is only supported on physical Ethernet-based ports.
•
In VPC environments, PTP must be individually configured on each member port.
•
PTP over FabricPath is not supported.
•
In case of a nondisruptive ISSU from a release earlier than Cisco NX-OS release 7.1(1)N1(1) to the
latest release, perform reload before enabling the PTP feature.
Cisco Nexus 5600 Series NX-OS System Management Configuration Guide, Release 7.x
62 OL-31641-01
Configuring PTP
Clock Management
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