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CoS on ACX Series Universal Access Routers Features Overview

The following key CoS features are supported on ACX Series Universal Access Routers:

• Physical interface-based classifiers at the [edit class-of-service interfaces interfaces-name] hierarchy level
• Fixed classification for all ingress packets traversing a logical interface to a single forwarding class. Fixed classification is supported on all interface types.
• EXP bits located in each MPLS label and used to encode the CoS value of a packet as it traverses a label-switched path (LSP). To configure global EXP bits, include the exp statement at the [edit class-of-service system-defaults classifiers] hierarchy level.
• Rewrite rules at the physical and logical interface levels including the following: IP type-of-service (ToS), DSCP, MPLS EXP bit value, and IEEE 802.1p bit value.
• Attachment of the following rewrite rules to the physical interface at the [edit class-of-service interfaces interface-name rewrite-rules] hierarchy level: IP ToS, DSCP, and IEEE 802.1p bit value.
• Rewrite rules for MPLS EXP bits on the logical interface at the [edit class-of-service interfaces interface-name unit unit-number rewrite-rule] hierarchy level.

  Note: Fine-grained rewrite is not possible, even when you use multifield filters, because of the application-specific integrated circuit (ASIC) limitation.

Queuing and scheduling features include:

• Support for up to eight forwarding classes.
• Support for up to eight egress queues per port.
• Internal buffer of 2 MB with per-egress queue buffer management.
• Three weighted random early detection (WRED) curves for TCP and one WRED curve for non-TCP. There are two fill levels and two drop probabilities per WRED curve; the drop probability corresponding to the first fill must be zero.
• Strict-priority and weighted deficit round-robin scheduling.
• Multiple strict-priority queues per port.
• Per-queue committed information rate (CIR) and peak information rate (PIR).
• Per-physical-port shaping.

Queue statistics features include:

• Per-egress-queue enqueue statistics in packets, bytes, packets per second (pps), and bits per second (bps).
• Per-egress-queue transmit statistics in packets, bytes, pps, and bps.
• Per-egress-queue drop statistics in packets and pps.