• Author : Jeff Chan


Forwarding Unicast PTP Packets in Boundary Mode

Description Until now, all PTP packets received on Arista switches with PTP boundary mode enabled will automatically be sent to the control plane to be processed. This is irrespective of whether the PTP packet is multicast or unicast. All PTP packets which have either the destination UDP port 319 or 320, or use the PTP ethertype will automatically be sent to the control plane. This release introduces a new feature which can be enabled by configuring “ptp forward unicast” globally on the switch while “ptp mode boundary” is configured. With this feature enabled, multicast PTP packets will continue to be...
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IEEE1588 (PTP) One-Step End-To-End Transparent Clock – New PTP Mode Support

Previously, EOS only supported the two-step variation of the transparent clock as described in the IEEE 1588 Specification. In this release, we now support one-step end-to-end transparent clock on certain platforms. The main advantage of one-step end-to-end transparent clock is all PTP packets are now completely handled in the forwarding plane, where as in the two-step variation, PTP messages needed to be handled in the control plane. This removes scaling limitations such as packet drops due to high packet intervals and reduces CPU utilization. Following the IEEE 1588 Specification, EOS’s implementation of one-step transparent clock now updates the correctionField of...
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SMPTE and AES PTP Profile Support

The SMPTE ST 2059-2:2015 and AES67-2013 standards define PTP profiles specifically developed for synchronization of audio and video streams being transported over an IP network. Each of these PTP profiles leverage the existing IEEE-1588 standards and vendor implementations while defining message rates and management messages unique to the requirements of rapid synchronization of end points for media streams. In this release, we have added support for both PTP profiles on all Arista platforms currently supporting PTP. The following additions were made. Expanded Maximum PTP Message Rates Both SMPTE ST 2059-2:2015 and AES67-2013 define faster message rates than what was previously...
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