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Cisco 12000/10700 v3.1.1 Router Manager User Guide

OL-4455-01

Chapter 11 Layer 3 QoS

CAR and WRED Overview

Implications of Engine Type

Engine type refers to different hardware architectures. From a management perspective, the engine type

determines what functionality is available to the client. Currently, this only applies to Layer 3 QoS. The

following is a summary of how engine type affects Layer 3 QoS:

• CAR—Supported for Engine 0 and 1

• CAR—Limited support for Engine 4

• PIRC—Supported for Engine 2 (see “Per Interface Rate Control (PIRC) Support” section on

page 11-6 for further details).

• WRED—Supported for Engine 0, 2, and 4 (see “Engine Type Support for WRED” section on

page 11-22 for further details).

Cisco 12000/10720 Router Manager will detect the engine type applicable to a given module (line card)

and prevent operations that are not applicable.

Note Auto-detection is not supported for Engine type 4.

CAR and WRED in Cisco 12000/10720 Router Manager

CAR and WRED are modeled as objects in Cisco 12000/10720 Router Manager. There are two types of

CAR objects: CAR policies and access lists. There is two types of WRED objects: CoS (Class of Service)

queue groups and ToFab policies.

When you create these objects in Cisco 12000/10720 Router Manager, you can work within the Layer 3

QoS view to create, apply, delete or edit Layer 3 QoS objects. Created CAR policies are placed under

the CAR Policies container in the Layer 3 QoS view. Created access lists are placed under the Access

List container in the Layer 3 QoS view. Created CoS queue groups are placed under the WRED-MDRR

container in the Layer 3 QoS view. Created ToFab polices are placed under the WRED-MDRR container

in the Layer3QoS view.

Tip Access lists are only supported within the realm of CAR and do not function as stand-alone

objects.

It is important to note that Layer 3 QoS CAR and WRED objects (access lists, policies, CoS queue

groups, ToFab policies) are global, meaning they can be applied to any module/interface object within

Cisco 12000/10720 Router Manager. For example, the CosQ groups are applied to interfaces whereas

the ToFab policies are applied to modules (line cards).

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