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.]

• 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.]

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