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Cisco AVVID Network Infrastructure Enterprise Quality of Service Design
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Chapter 3 QoS in an AVVID-Enabled Campus Network
Selecting an Access-Layer Switch
Step 3
Configure CoS trust.
4006-SUPIII-Access(config-if)#int g 3/2
4006-SUPIII-Access(config-if)#qos trust cos
Step 4
Enable the priority queue on this interface.
4006-SUPI(config-if-tx-queue)#tx-queue 3
4006-SUPI(config-if-tx-queue)#priority high
Verifying the Configuration
On the Catalyst 4000 access-layer switch, you can verify the configuration and performance during
periods of high congestion by examining the output of the following commands:
Example 3-8
Displaying QoS CoS Mapping Information
4006-SUPIII-Access#show qos map cos
CoS-DSCP Mapping Table
CoS: 0 1 2 3 4 5 6 7
--------------------------------
DSCP: 0 8 16
26 34 46 48 56
Example 3-9
Displaying QoS DSCP Mapping Information
4006-SUPIII-Access#show qos map dscp tx-queue
DSCP-TxQueue Mapping Table (dscp = d1d2)
d1 : d2 0 1 2 3 4 5 6 7 8 9
-------------------------------------
0 : 01 01 01 01 01 01 01 01 01 01
1 : 01 01 01 01 01 01 02 02 02 02
2 : 02 02 02 02 02 02 02 02 02 02
3 : 02 02 03 03 03 03 03 03 03 03
4 : 03 03 03 03 03 03 03 03 04 04
5 : 04 04 04 04 04 04 04 04 04 04
6 : 04 04 04 04
Command
Description
See
show qos map cos
Displays the QoS CoS mapping information.
show qos map dscp
Displays the QoS DSCP mapping information.
show qos interface interface
Displays QoS queuing information.
show policy-map interface
Displays statistics and configurations of input
and output policies attached to an interface.
show interface counters
Displays statistics regarding traffic seen on the
physical interface.