36-37
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 36 Configuring QoS
Configuring Standard QoS
Configuring Classification Using Port Trust States
These sections describe how to classify incoming traffic by using port trust states. Depending on your
network configuration, you must perform one or more of these tasks or one or more of the tasks in the
“Configuring a QoS Policy” section on page 36-43:
• Configuring the Trust State on Ports within the QoS Domain, page 36-37
• Configuring the CoS Value for an Interface, page 36-38
• Configuring a Trusted Boundary to Ensure Port Security, page 36-39
• Enabling DSCP Transparency Mode, page 36-40
• Configuring the DSCP Trust State on a Port Bordering Another QoS Domain, page 36-41
Configuring the Trust State on Ports within the QoS Domain
Packets entering a QoS domain are classified at the edge of the QoS domain. When the packets are
classified at the edge, the switch port within the QoS domain can be configured to one of the trusted
states because there is no need to classify the packets at every switch within the QoS domain.
Figure 36-12 shows a sample network topology.
Figure 36-12 Port Trusted States within the QoS Domain
201781
Tr un k
Trusted interface
Traffic classification
performed here
Trusted boundary
P1P3
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