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CoS on SONET/SDH OC48/STM16 IQE PIC Overview

The SONET/SDH OC48/STM16 IQE PIC is a clear-channel PIC that is designed to provide better scaling and improved queuing, buffering, and traffic shaping along with clear-channel functionality. Class of service (CoS) on the SONET/SDH OC48/STM16 IQE PIC supports per data-link connection identifier (DLCI) queuing at egress. The SONET/SDH OC48/STM16 IQE PIC can be used in Juniper Networks M320, MX240, MX960, T640, and T1600 routers.

The SONET/SDH OC48/STM16 IQE PIC supports the following CoS features:

• Eight queues per logical interface.

  Note: Queue configuration in other modes, such as 4 queues per scheduler, is not supported on the SONET/SDH OC48/STM16 IQE PIC.

• Two shaping rates: a committed information rate (CIR) and peak information rate (PIR) per data-link connection identifier (DLCI).
• Sharing of excess bandwidth among logical interfaces.
• Five levels of priorities—three priorities for traffic below the guaranteed rate and two priorities for traffic above the guaranteed rate. By default, a strict-high queue gets the excess high priority and all other queues get the excess low priority.
• Ingress behavior aggregate (BA) classification.
• Translation table and egress rewrite.
• Egress delay buffer of 214ms.
• Forwarding class to queue remapping per DLCI.
• Weighted round-robin (WRR), weighted random early detection (WRED).
• Rate limit on all queues to limit the transmission rate.
• Per unit scheduling via DLCI at egress, where each DLCI gets a dedicated set of queues and a scheduler. When per unit scheduling is configured, the shaping can be configured at the logical and physical interface levels.

  Note: Because the SONET/SDH OC48/STM16 IQE PIC is not an oversubscribed PIC, there is no ingress queuing. Therefore, ingress scheduling or shaping is not supported in SONET/SDH OC48/STM16 IQE PIC.

• Packet or byte statistics are separately collected for ingress and egress queues. The SONET/SDH OC48/STM16 IQE PIC provides the following statistics:
  • Ingress statistics:
    • Per logical interface transmit and drop bytes/packets statistics (based on Layer 3).
    • Per physical interface traffic bytes/packets statistics (based on Layer 2).
  • Egress statistics:
    • Per queue transmit and drop bytes/packets statistics (based on Layer 2).
    • Per queue per color drop bytes/packets statistics (based on Layer 2).
    • Per logical interface transmit and drop bytes/packets statistics (based on Layer 3).
    • Per physical interface traffic bytes/packets statistics (based on Layer 2).

To configure the features mentioned above, include the corresponding class-of-service (CoS) statements at the [edit class-of-service] hierarchy level. The CoS configuration statements supported on the SONET/SDH OC48/STM16 IQE PIC are the same as the CoS configuration statements supported on the IQ2E PIC except for the following unsupported statements.

• max-queues-per-interface
• no-concatenate
• q-pic-large-buffer
• red-buffer-occupancy
• ingress-shaping-overhead
• traffic manager mode

• input-excess-bandwidth-share
• input-traffic-control-profile
• per-session-scheduler
• simple-filter