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Class of Service

  • Support for on-chip queue buffer for PFC-enabled queues (PTX10008)—The PTX10008 views and installs a priority-based flow control (PFC)-enabled queue with a buffer-size less than 450 microseconds as a PFC-enabled on-chip queue. When a queue is in PFC on-chip mode, the entire virtual output queue (VOQ) buffer is always on-chip and is not scaled based on bandwidth usage.

    [See buffer-size (Schedulers).]

  • HCoS interoperability support (PTX10008 with the Express 5-based PTX10K-LC1301-36DD line card)—By default, PTX10008 routers boot with Express 5-based PTX10K-LC1301-36DD line cards in interop mode. This mode does not support hierarchical class-of-service (HCoS) configuration on the PTX10K-LC1301-36DD line card. To enable HCoS on this line card, run the set chassis interoperability express5-enhanced command. Commit the change and reboot the router. After the reboot, the PTX10008 with the PTX10K-LC1301-36DD line card supports HCoS configuration.

    [See Hierarchical Class of Service Overview.]

  • Per-queue accounting of ECN packets (PTX10002-36QDD and PTX10008)—You can track explicit congestion notification (ECN)-marked traffic with ECN-CE packet and byte counters in queue statistics, helping you monitor congestion and validate ECN behavior. Enable support by setting class-of-service options hierarchical-scheduler-disable, and then reboot to operate in non-HCoS mode.

    [See ECN Packets per Queue and show interfaces queue.]