Cisco Catalyst 3750-E User Manual

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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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Chapter 37 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 37-49:
• Configuring the Trust State on Ports within the QoS Domain, page 37-43
• Configuring the CoS Value for an Interface, page 37-44
• Configuring a Trusted Boundary to Ensure Port Security, page 37-45
• Enabling DSCP Transparency Mode, page 37-46
• Configuring the DSCP Trust State on a Port Bordering Another QoS Domain, page 37-47
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 37-14 shows a sample network topology.
Figure 37-14 Port Trusted States within the QoS Domain
101236
Trunk
Trusted interface
Traffic classification
performed here
Trusted boundary
IP
P1P3

Cisco Catalyst 3750-E Specifications

General

Series	Catalyst 3750-E
Switching Capacity	32 Gbps
Stacking Bandwidth	32 Gbps
StackWise Plus	Yes
Layer Support	Layer 3
MAC Address Table Size	12, 000 entries
RAM	256 MB
Flash Memory	64 MB
Memory	256 MB DRAM, 64 MB Flash
Operating Temperature	32 to 113°F (0 to 45°C)
Ports	48 10/100/1000 Ethernet ports
Form Factor	Rack-mountable
Jumbo Frame Support	Yes
Input Voltage	100 to 240 VAC
Storage Temperature	-25 to 70 °C
Relative Humidity	10 to 90% non-condensing