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Key Features in Junos OS Evolved Release 22.3

Start here to learn about the key features in Junos OS Evolved Release 22.3. For more information about a feature, click the link in the feature description.

  • Limited image version support of Junos OS Evolved (ACX7509)

    This limited image does not have data-plane encryption and is intended only for the countries of the Eurasian Customs Union (EACU). These countries have import restrictions on software containing data-plane encryption.

    [See Junos OS Evolved Installation Packages.]

  • Priority-based flow control X-ON Threshold and per-queue alpha support (QFX5220)—The priority-based flow control (PFC) X-ON threshold is the ingress port's priority group (PG) shared buffer limit. At this limit, the ingress port's peer resumes transmission of packets after a brief PAUSE because of the PFC message sent by this ingress port. You can tune globally the limit of buffers that each queue can consume from the shared pool based on the dynamic threshold setting called the alpha value. Starting with Junos OS Evolved 22.3R1 on QFX5220 devices, you can fine tune the X-ON threshold through the congestion notification profile (CNP) and fine tune the alpha value on a per-queue basis through a scheduler.

    [See xon (Input Congestion Notification) and buffer-dynamic-threshold .]

  • Synchronous Ethernet with G.8262 Standard Support (ACX7509)—Starting in Junos OS Evolved Release 22.3R1, ACX7509 routers support Synchronous Ethernet features compliant with the following International Telecommunication Union Telecommunication Standardization (ITU-T) standards to facilitate the transference of clock signals over the Ethernet physical layer.

    • Synchronous Ethernet (G.8262) – Timing and synchronization aspects in packet networks. Specifies timing characteristics of synchronous Ethernet equipment clock (EEC).

    • Synchronous Ethernet Enhanced (G.8262.1)

    [See Synchronous Ethernet.]

  • Telemetry support for CoS ingress packet drop accounting (QFX5220)—Junos OS Evolved Release 22.3R1 introduces telemetry support to account for packets that are dropped because of ingress port congestion. Counters for priority flow control (PFC), explicit congestion notification (ECN), and ingress drops are exported using the sensor /junos/system/linecard/interface/traffic. Counters for PFC, ECN, and ingress drops are also exported using OpenConfig sensor /interfaces/interface/. Priority group (PG) buffer utilization is exported using the sensor /junos/system/linecard/qmon-sw/.

    [See Guidelines for gRPC and gNMI Sensors (Junos Telemetry Interface).]