- Written by Yin Chen
- Posted on May 9, 2022
- Updated on June 2, 2022
- 6607 Views
Precision Time Protocol (PTP) management messages are general messages sent to PTP-enabled switches on the data plane. On Arista switches, its behavior depends on the configured PTP mode.
- Written by Jeff Chan
- Posted on January 18, 2019
- Updated on January 23, 2019
- 7213 Views
Until now, all PTP packets received on Arista switches with PTP boundary mode enabled will automatically be sent to
- Written by Yin Chen
- Posted on October 30, 2023
- Updated on October 31, 2023
- 3742 Views
This article provides a general introduction to Precision Time Protocol (PTP) supported within EOS. PTP is aimed at distributing time with sub-microsecond accuracy. PTP support is based on the IEEE-1588 specification for version 2 of the protocol.
- Written by Sourabh Bollapragada
- Posted on January 3, 2023
- Updated on February 7, 2024
- 6116 Views
PTP 1-step Boundary Clock (or 1-step BC) is similar to 2-step BC in function but doesn’t send the PTP Follow_Up message. The timestamp present in the PTP Follow_Up message’s preciseOriginTimestamp field is sent in the PTP Sync message’s originTimestamp field along with a non-zero correctionField. This allows us to support more PTP master ports because the control plane does not need to generate PTP Follow_Up messages anymore. PTP 1-step BC supports all the existing features supported by 2-step BC like G8275.1 profile, G8275.2 profile, etc unless otherwise specified in the limitations.
- Written by Ryan Lui
- Posted on October 20, 2021
- Updated on October 20, 2021
- 6747 Views
This brief TOI describes a small update made to Arista’s implementation of the Best Master Clock Algorithm (BMCA),
- Written by Kieran Weaver
- Posted on March 3, 2023
- Updated on February 2, 2024
- 5901 Views
Media Access Control Security (MACsec) is an industry-standard encryption mechanism that protects all traffic flowing on the Ethernet links. MACsec is based on IEEE 802.1X and IEEE 802.1AE standards.
- Written by Shyam Kota
- Posted on August 16, 2018
- Updated on October 1, 2018
- 6667 Views
This feature allows users to view most recent history of offset from master, mean path delay and skew values via CLI
- Written by Shifeng Jin
- Posted on December 7, 2020
- Updated on December 9, 2020
- 7507 Views
Since the introduction of PTP Monitoring feature[1], PTP is capable of recording recent metrics for offset from
- Written by Yin Chen
- Posted on March 3, 2023
- Updated on March 7, 2023
- 4604 Views
This TOI document describes the supported Precision Time Protocol (PTP) functionality on the CCS-750X platforms. Due to the nature of the hardware for these products, the supported PTP functionality and interoperation with other features may differ from other Arista products.
- Written by Simon Eteen
- Posted on May 9, 2022
- Updated on September 16, 2024
- 6468 Views
The`ptp forward-v1` command configures the switch to forward Precision Time Protocol version 1 packets as regular multicast traffic. By default, when PTP is enabled and PTPv1 packets are received on the PTP enabled interfaces, these packets are trapped by the CPU, logged and discarded. The feature is already supported on various Arista platforms, this article highlights added support on the 7280R/7280R2/7020R/7500R/7500R2 platforms in EOS 4.26.0F and on the 7280R3/7500R3/7800R3/7289 platforms in EOS 4.29.0F. It highlights some differences in support for 7280/7500/7800 R/R2 platforms versus 7280/7500/7800 R3 platforms.
- Written by Scott Bailey
- Posted on March 3, 2023
- Updated on August 30, 2023
- 4665 Views
This feature enables L3 reachability for the PTP on the switch using one or more shared “Loopback” interfaces.
- Written by Scott Bailey
- Posted on November 6, 2023
- Updated on November 7, 2023
- 3294 Views
This feature allows configuring a per-port PTP domain number, which may be different from the global PTP domain number, which will apply to PTP messages sent or received on that port. With this configuration applied, transmitted messages will contain the port-specific domain number and received messages will be accepted if they contain the port-specific or global domain number.
- Written by Jim George
- Posted on November 22, 2023
- Updated on November 22, 2023
- 3442 Views
The PTP Boundary Clock advertises time based on its local clock, which is counting from an unsynchronized initial value. Hence a free running Boundary Clock would advertise PTP downstream based on counting from an unsynchronized initial value. The GrandMaster, with access to GPS, is however Temps Atomique International (TAI) based. Hence Boundary Clock, which was originally based on unsynchronized initial value, post synchronization with the GrandMaster becomes TAI based. This causes the Boundary Clock’s time and hence PTP advertised downstream, to change drastically.
- Written by Yin Chen
- Posted on December 17, 2021
- Updated on May 5, 2022
- 6533 Views
This article describes the usage of the ptp free-running source clock command, which selects a time source used by a switch running the Precision Time Protocol (PTP) while it is in a free-running state.
- Written by Zhen Xue
- Posted on September 2, 2021
- Updated on July 19, 2023
- 9034 Views
From the Precision Time Protocol (PTP) perspective, Multi Chassis Link Aggregation (MLAG) peers are two physical
- Written by Charlotte Fedderly
- Posted on June 20, 2022
- Updated on July 19, 2024
- 5749 Views
Synchronous Ethernet (SyncE) provides support for frequency synchronization over Ethernet between devices traceable to an external frequency reference, like a primary reference clock, as specified in ITU G.8261.
- Written by Harold Fong
- Posted on August 30, 2019
- Updated on September 5, 2019
- 8785 Views
This feature makes the PTP agent aware of VLANs, running with a single Best Master Clock Algorithm (BMCA). It allows