Enterprise QoS Solution Reference Network Design Guide

Catalyst 3550—QoS Considerations and Design
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Enterprise QoS Solution Reference Network Design Guide
Chapter 2 Campus QoS Design
Note Enabling QoS in the Catalyst 3550 may (depending on the software version) require the disabling of
IEEE 802.3X flow control on all interfaces (if enabled). Flowcontrol can be disabled on an interface by
using the interface commands: flowcontrol receive off and flowcontrol send off.
Catalyst 3550—Trusted Endpoint Model
Configuration
This section includes the following topics:
Configuration
Catalyst MLS QoS Verification Commands
Configuring a Catalyst 3550 switchport to trust an endpoint is identical to the configuration required on
a Catalyst 2950, provided that QoS has been globally enabled on the Catalyst 3550. Configuration is
shown below.
Example 2-15 Catalyst 3550—Trusted Endpoint
CAT3550(config)#interface FastEthernet0/1
CAT3550(config-if)#mls qos trust dscp
Catalyst MLS QoS Verification Commands
Catalyst MLS QoS verification commands for the trusted endpoint model include the following:
show mls qos
show mls qos interface
Catalyst 3550—AutoQoS VoIP Model
The Catalyst 3550 supports AutoQoS VoIP with the following keyword options:
auto qos voip cisco-phone
auto qos voip cisco-softphone
auto qos voip trust
When you enable AutoQoS VoIP on the Catalyst 3550 by using the auto qos voip cisco-phone, the auto
qos voip cisco-softphone, or the auto qos voip trust interface configuration command, the switch
automatically generates a QoS configuration based on the traffic type and ingress packet label and
applies the commands listed in Table 2-2 to the interface.
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