Name: Cisco 4500M
Brand: Cisco
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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW

78-16201-01

Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches

qos dbl

To enable Dynamic Buffer Limiting (DBL) globally on the switch, use the qos dbl command. To disable

DBL, use the no form of this command.

qos dbl [buffers {aggressive-flow buffers} | credits {aggressive-flow credits |

maximum max} | exceed-action {ecn | probability percent } |

flow {include [layer4-ports] [vlan]}]

no qos dbl [buffers {aggressive-flow buffers} | credits {aggressive-flow credits |

maximum max} | exceed-action {ecn | probability percent } |

flow {include [layer4-ports] [vlan]}]

Syntax Description

Defaults The default settings are as follows:

• QoS DBL is disabled.

• Aggressive-flow buffers is set to 2.

• Aggressive-flow credits is set to 2.

• Layer 4 ports are included.

• VLANs are included.

• 15 maximum credits are allowed.

• 15% drop probability is set.

Command Modes Global configuration

QoS policy-map class configuration

buffers (Optional) Specifies buffer limit for aggressive flows.

aggressive-flow (Optional) Specifies aggressive flow.

buffers (Optional) Number of buffers for aggressive flows; valid values are from 0 to 255.

credits (Optional) Specifies credit limit for aggressive flows and all flows.

credits (Optional) Number of credits for aggressive flows; valid values are from 0 to 15.

maximum (Optional) Specifies maximum credit for all flows.

max (Optional) Number of credits for all flows; valid values are from 0 to 15.

exceed-action (Optional) Specifies packet marking when limits are exceeded.

ecn (Optional) Specifies explicit congestion notification.

probability (Optional) Specifies probability of packet marking.

percent (Optional) Probability number; valid values are from 0 to 100.

flow (Optional) Specifies flows for limiting.

include (Optional) Allows Layer 4 ports and VLANs to be included in flows.

layer4-ports (Optional) Includes Layer 4 ports in flows.

vlan (Optional) Includes VLANs in flows.

Cisco 4500M Command Reference

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