•
The slave uses these timestamps to adjust its clock to the time of its master.
High Availability for PTP
Stateful restarts are not supported for PTP.
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
•
In a Cisco Nexus 3500 only environment, PTP clock correction is expected to be in the 1- to 2-digit
range, from 1 to 99 nanoseconds. However, in a mixed environment, PTP clock correction is expected
to be up to 3 digits, from 100 to 999 nanoseconds.
•
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-capable ports do not identify PTP packets and do not time-stamp or redirect those packets unless
you enable PTP on those ports.
•
1 packet per second (1 pps) input is not supported.
•
PTP over IPv6 is not supported.
•
Cisco Nexus 3500 Switches support a maximum of 32 PTP sessions
•
Cisco Nexus switches should be synchronized from the neighboring master using a synchronization log
interval that ranges from –3 to 1.
Default Settings for PTP
The following table lists the default settings for PTP parameters.
Cisco Nexus 3548 Switch NX-OS System Management Configuration Guide, Release 6.x
10
Configuring PTP
High Availability for PTP
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