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Class of Service

  • Support for forwarding-class policy and routing information base (RIB) (PTX10008)—Starting in Junos OS Evolved Release 21.3R1, RIB APIs can perform the routing and wavelength assignment.

    A new configuration statement match-next-hop-forwarding-class is introduced at the [edit class-of-service forwarding-policy next-hop-map map-name forwarding-class class-name] hierarchy level. This statement enables applications to specify the next hop with a forwarding-class. Application specified forwarding-class must be a predefined forwarding-class or a forwarding-class that is configured using CLI.

    [See forwarding-class (Forwarding Policy), and forwarding-class-default (Forwarding Policy).]

  • Support for importing Classifier and/or Rewrite Rules (PTX10001-36MR, PTX10003, PTX10008, QFX5220)—Starting in Junos OS Evolved Release 21.3R1, you can import classifier and/or rewrite rules to form new rules in the PTX10001-36MR, PTX10003, PTX10008, and QFX5220 platforms.

    [See Understanding Applying CoS Classifiers and Rewrite Rules to Interfaces.]

  • Support for Deep Buffering (ACX5448)—Starting in Junos OS Release 21.3R1, ACX 7100 supports deep buffering of oversubscribed traffic and absorbs network bursts.
    • Packets are buffered using on-chip SRAM and external high bandwidth memory (HBM).
    • OCB size is 16MB and HMB size is 8GB.
    • The default delay buffer size per port is 100 us.
    • Bursts up to 20ms of buffer per port is absorbed.

      This feature is enabled by default.

      [See Shared and Dedicated Buffer Memory Pools on ACX Series Routers.]

  • Support for ECN and PFC (PTX10004)—Starting in Junos Release 21.3R1-EVO, support for priority-based flow control (PFC) at Layer 3 for untagged traffic and explicit congestion notification (ECN) are introduced in PTX10004.

    [See Understanding PFC Using DSCP at Layer 3 for Untagged Traffic and Understanding CoS Explicit Congestion Notification.]