Canoga-perkins 9175 Configuration Guide Manual do Utilizador descarregar pdf (Página 211)

CanogaOS Configuration Guide

31-5

Mapping Tables

During QoS processing, the switch represents the priority of all traffic (including non-IP

traffic) with an internal priority value:

• During classification, QoS uses configurable mapping tables to derive the internal

priority (a 6-bit value) from received CoS, EXP(3-bit), DSCP or IP precedence

(3-bit) values. These maps include the CoS-to-priority-color map,

EXP-to-priority-color map, DSCP-to-priority-color map and the IP-precedence-to-

priority-color map.

• During policing, QoS can assign another priority and color to an IP or non-IP

packet (if the packet matches the class-map). This configurable map is called the

policed-priority-color map.

• Before the traffic reaches the scheduling stage, and replace CoS or DSCP is set,

QoS uses the configurable priority-color-to-CoS or priority-color-to-DSCP map to

derive a CoS or DSCP value from the internal priority color.

31.3 Configuration Guidelines

The following provides information to consider before configuring QoS:

• QoS policing cannot be configured on Linkagg interface.

• Traffic can be only classified per ingress port.

• There can be multiple ACLs per class map. An ACL can have multiple access

control entries that match fields against the packet contents.

• Policing cannot be done at the switch virtual interface level.

31.4 Configuration

The following subsections provide examples of how to enable and configure QoS.

Commands are indicated in bold Courier type. Parameters are indicated in plain Courier

type. Additional information is indicated in Arial type.

31.4.1 Enable QoS

By default, QoS is disabled on the switch, which means that the switch offers best-effort

service to each packet regardless of the packet contents or size. All the packets map to

egress queue 0 with both tail-drop thresholds set to 100 percent of the total queue size.

When the buffer is full, packets are dropped.

To enable QoS, enter the following commands from Privileged Exec mode.

• configure terminal.

• qos enable

Note: The no qos enable command disables QoS.

The following example shows enabling QoS.

DUT# configure terminal

DUT(config)# qos enable

31.4.2 Configure egress queue

Tail Drop

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