Filter
Top Products
37-23
Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 37 Configuring Quality of Service
Configuring QoS on Supervisor Engines II-Plus, II+10GE, IV, V, V-10GE, 4924, 4948, and 4948-10GE
Enabling DBL Globally
To enable DBL globally on the switch, perform this task:
This example shows how to enable DBL globally and verify the configuration:
Switch# configure terminal
Switch(config)# qos dbl
Global DBL enabled
Switch(config)# end
Switch# show qos dbl
QOS is enabled globally
DBL is enabled globally on DSCP values:
0-63
DBL flow includes vlan
DBL flow includes layer4-ports
DBL does not use ecn to indicate congestion DBL exceed-action probability: 15% DBL max
credits: 15 DBL aggressive credit limit: 10 DBL aggressive buffer limit: 2 packets
Switch#
You can enable DBL on the egress interface direction by applying a service policy:
Switch# conf terminal
Switch(config)# policy-map dbl
Switch(config-pmap)# class class-default
Switch(config-pmap-c)# dbl
Switch(config-pmap-c)# end
Switch#
00:08:12: %SYS-5-CONFIG_I: Configured from console by console
Switch# conf terminal
Switch(config)# int gig 1/2
Switch(config-if)# service-policy output dbl
Switch(config-if)# end
Switch#
Selectively Enable DBL
Note Selective DBL is not supported on Supervisor Engine 6-E, Supervisor Engine 6L-E, Catalyst 4900M,
and Catalyst 4948E.
DSCP values enable you to selectively apply DBL for IP packets only (single or untagged). Refer to the
“Enabling DBL on Specific IP DSCP Values” section on page 37-24.
To selectively apply DBL for non-IP packets or double-tagged packets (such as Q-in-Q), you must use
CoS values. Refer to the “Enabling DBL on Specific CoS Values” section on page 37-25.
Command Purpose
Step 1
Switch(config)# qos dbl
Enables DBL on the switch.
Use the no qos dbl command to disable AQM.
Step 2
Switch(config)# end
Exits configuration mode.
Step 3
Switch# show qos dbl
Verifies the configuration.