Queue-Limit - Cisco Catalyst 3750 Metro Command Reference Manual

Hide thumbs Also See for Catalyst 3750 Metro:

Table of Contents

queue-limit

Use the queue-limit policy-map class configuration command to configure the maximum threshold for

tail drop in a hierarchical policy map attached to an enhanced-services (ES) port. Use the no form of this

command to return to the default setting.

Syntax Description

The maximum threshold is 128 packets.

Command Modes

Policy-map class configuration

Command History

Usage Guidelines

Class-based weighted fair queueing (CBWFQ) creates a queue for every class for which a class map is

defined. Packets satisfying the match criteria for a class accumulate in the queue reserved for the class

until they are sent, which occurs when the queue is serviced by the fair queue process. When the

maximum packet threshold you defined for the class is reached, any more packets destined for the class

queue are dropped according to the tail drop or Weighted Random Early Detection (WRED) mechanism.

With tail drop, packets are queued until the maximum threshold is exceeded, and then all the packets are

Use the queue-limit command only in a hierarchical policy map attached to an ES port. You can use this

command only in class-level classes.

You must configure the bandwidth or the shape policy-map class configuration command before you

configure either the queue-limit or the random-detect policy-map class configuration command in a

class policy.

You can define a class policy to use either tail drop through the queue-limit policy-map class

configuration command or to use WRED packet drop through the random-detect policy-map class

configuration command. You cannot use the queue-limit and random-detect commands in the same

class policy, but they can be used in two class policies in the same policy map.

You cannot use the bandwidth, queue-limit, random-detect, and the shape policy-map class

configuration commands with the priority policy-map class configuration command in the same class

within the same policy map. However, you can use these commands in the same policy map.

Catalyst 3750 Metro Switch Command Reference

queue-limit limit

no queue-limit

Queue maximum threshold on an ES port. The range is 1 to 32768 packets.

Modification

This command was introduced.

Hierarchical service policies can be attached to inbound traffic received on

Catalyst 3750 Metro Switch Cisco IOS Commands