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Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 26 Configuring QoS
Configuring Standard QoS
To return to the default DSCP output queue threshold map or the default CoS output queue threshold
map, use the no mls qos srr-queue output dscp-map or the no mls qos srr-queue output cos-map
global configuration command.
This example shows how to map DSCP values 10 and 11 to egress queue 1 and to threshold 2:
Switch(config)# mls qos srr-queue output dscp-map queue 1 threshold 2 10 11
Configuring SRR Shaped Weights on an Egress Queue-Set
You can specify how much of the available bandwidth is allocated to each queue in the queue-set. The
ratio of the weights is the ratio of frequency in which the SRR scheduler sends packets from a standard
port.
Note SRR shaping is not supported on the ES ports; however, you can configure average-rate shaping. For
more information, see the “Configuring Shaping” section on page 26-99.
You can configure the egress queues for shaped weights, shared weights, or both. Use shaping to smooth
bursty traffic or to provide a smoother output over time. For conceptual information, see the “SRR
Shaping and Sharing” section on page 26-14. For configuration information, see the “Configuring SRR
Shared Weights on an Egress Queue-Set” section on page 26-73.
Note The egress queue-set default settings are suitable for most situations. You should change them only when
you have a thorough understanding of the queues and only if these settings do not meet your QoS
solution.
Beginning in privileged EXEC mode, follow these steps to assign the shaped weights and to enable
bandwidth shaping on a standard port mapped to the four egress queues. This procedure is optional.
Step 4
show mls qos maps Verify your entries.
The DSCP output queue threshold map appears as a matrix. The d1
column specifies the most-significant digit of the DSCP number; the d2
row specifies the least-significant digit in the DSCP number. The
intersection of the d1 and the d2 values provides the queue ID and
threshold ID; for example, queue 2 and threshold 1 (02-01).
The CoS output queue threshold map shows the CoS value in the top row
and the corresponding queue ID and threshold ID in the second row; for
example, queue 2 and threshold 2 (2-2).
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify a standard port, and enter interface configuration mode.
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