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Understanding IEEE 1588 Precision Timing Protocol (PTP) over IRB for Broadcast profiles

The IEEE 1588 PTP boundary clock (BC) applications for broadcast media often requires many PTP streams to use a common local IP address. These packets are forwarded through L2 switching. In these use cases, there are no physical interface IFLs created for each PTP physical interface, as would be usually expected for PTP configurations on physical interfaces. Configuration over integrated routing and bridging (IRB) interfaces allows you to meet this requirement. Currently, there is an existing feature that supports multicast-mode with physical interfaces. PTP over IRB for broadcast profiles will extend this support for physical interfaces on IRB interfaces. PTP BC over IRB for broadcast profiles will support SMPTE/AES67/AES67-SMPTE profiles (multicast PTP over IP). This new interface type is added to the multicast profiles. The PTP multicast-mode supports IRB interfaces using the IPv4 transport type that is used with physical interfaces.


PTP BC features developed for QFX5110 and QFX5200 are still available. Support is extended to IRB interfaces for PTP BC over multicast for broadcast profiles.

CLI Configuration

A new CLI configuration is added to this feature for multicast mode to identify the L2 interface that needs to be transported. This new interface type is supported in the example configuration statements below.

IPv4 Configuration Example

Multiple IRB IPv4 Configuration Example

CLI Commands

There are no new operational commands being added. Areas in the display output that show an interface name will show the appropriate name for the IRB interface and will be expanded to include the L2 IFL name for IRB interfaces.


Available vty commands that are used to help diagnose the operation of the clksyncd and PTP protocol stack will not change, but will support the new interface types and information.

show ptp lock-status detail

show ptp primary detail

show ptp slave detail

show ptp statistics

show ptp statistics detail