Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
dbl
dbl
To enable active queue management on a transmit queue used by a class of traffic, use the dbl command.
Use the no form of this command to return to the default setting.
dbl
no dbl
Syntax Description This command has no keywords or arguments.
Defaults Active queue management is disabled.
Command Modes Policy-map class configuration
Command History
Usage Guidelines The semantics of the DBL configuration is similar to the WRED algorithm. The dbl command can
operate alone on class-default; otherwise, it requires you to configure the bandwidth or shape
commands on the class.
Examples This example shows how to enable dbl action in a class:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# dbl
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet 1/1
Switch(config-if)# service-policy output policy1
Switch(config-if)# end
Related Commands
Release Modification
12.1(8a)EW This command was introduced on the Catalyst 4500 series switch.
12.2(40)SG Support added on Supervisor Engine 6E.
Command Description
bandwidth Creates a signaling class structure that can be referred to by its
name.
class Creates a class map to be used for matching packets to the class
whose name you specify and to enter class-map configuration
mode.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E