Configuring Layer 3 Queue Limit And Drop Policies; Controlling Packet Dropping By Setting The Size Of A Class Queue - Cisco 10000 Series Configuration Manual

Quality of service configuration guide

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Configuring Layer 3 Queue Limit and Drop Policies

Configuring Layer 3 Queue Limit and Drop Policies

To configure the queue limit of a class queue and a drop policy, perform any of the following

configuration tasks:

To control when the router drops packets (for example, using tail drop), configure the maximum number

of packets a class queue can hold by entering the following commands beginning in global configuration

Router(config)# policy-map policy-map-name

Router(config-pmap)# class class-map-name

Router(config-pmap-c)# bandwidth

{bandwidth-kbps | percent percent}

Cisco 10000 Series Router Quality of Service Configuration Guide

For PRE1, you cannot use DSCP-based and IP precedence-based WRED together in the same policy

On a PRE2, the CoS-based WRED feature is not supported.

Controlling Packet Dropping by Setting the Size of a Class Queue, page 11-24

Dropping Packets Based on a Differentiated Services Code Point, page 11-26

Dropping Packets Based on IP Precedence, page 11-28

Dropping Packets Based on the Discard Class, page 11-29

Dropping Packets Based on the ATM Cell Loss Priority, page 11-31

Specifies the name of the policy map and enters policy-map

configuration mode.

policy-map-name is the name of the policy map.

Assigns the traffic class you specify to the policy map. Enters

policy-map class configuration mode.

class-map-name is the name of a previously configured class

map and is the traffic class for which you want to define QoS

Specifies the amount of bandwidth (in kbps or as a percentage

of available bandwidth) to be assigned to the class. The

amount of bandwidth configured should be large enough to

also accommodate Layer 2 overhead.

Managing Packet Queue Congestion

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