- Written by Yin Chen
- Posted on 5月 9, 2022
- Updated on 6月 2, 2022
- 7216 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 1月 18, 2019
- Updated on 1月 23, 2019
- 7800 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 10月 30, 2023
- Updated on 10月 31, 2023
- 4436 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 1月 3, 2023
- Updated on 2月 7, 2024
- 6753 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 10月 20, 2021
- Updated on 10月 20, 2021
- 7379 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 3月 3, 2023
- Updated on 2月 2, 2024
- 6538 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 8月 16, 2018
- Updated on 10月 1, 2018
- 7267 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 12月 7, 2020
- Updated on 12月 9, 2020
- 8096 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 3月 3, 2023
- Updated on 3月 7, 2023
- 5161 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 5月 9, 2022
- Updated on 9月 16, 2024
- 7146 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 3月 3, 2023
- Updated on 8月 30, 2023
- 5209 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 11月 6, 2023
- Updated on 11月 7, 2023
- 3895 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 11月 22, 2023
- Updated on 11月 20, 2024
- 4060 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 12月 17, 2021
- Updated on 5月 5, 2022
- 7121 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 9月 2, 2021
- Updated on 7月 19, 2023
- 9781 Views
From the Precision Time Protocol (PTP) perspective, Multi Chassis Link Aggregation (MLAG) peers are two physical
- Written by Charlotte Fedderly
- Posted on 6月 20, 2022
- Updated on 7月 19, 2024
- 6347 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 8月 30, 2019
- Updated on 9月 5, 2019
- 9408 Views
This feature makes the PTP agent aware of VLANs, running with a single Best Master Clock Algorithm (BMCA). It allows