Cisco 2950G 24 - Catalyst Switch Software Configuration Manual page 529

Chapter 26 Configuring QoS
Note Both the EI and SI support this feature.
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 26-3
Figure 26-3 Port Trusted States within the QoS Domain
78-14982-01
shows a sample network topology.
Trusted interface
Catalyst 2950
wiring closet
IP
Catalyst
3550-12T switch
Trunk
Classification
of traffic
performed here
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring QoS
26-11