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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 27 Configuring Quality of Service
Configuring Auto-QoS
Auto-QoS Configuration Example
This section describes how you could implement auto-QoS in a network, as shown in Figure 27-5.
Figure 27-5 Auto-QoS Configuration Example Network
The intelligent wiring closets in Figure 27-5 are composed of Catalyst 4500 switches. The object of this
example is to prioritize the VoIP traffic over all other traffic. To do so, enable auto-QoS on the switches
at the edge of the QoS domains in the wiring closets.
Note You should not configure any standard QoS commands before entering the auto-QoS commands. You
can fine-tune the QoS configuration, but we recommend that you do so only after the auto-QoS
configuration is completed.
Cisco router
Intelligent wiring closet
Catalyst 4500 switch
Catalyst
4500 switch
Catalyst 4500 switch
at the edge of the
QoS domain
Catalyst 4500 switch
at the edge of the
QoS domain
Catalyst
4500 switch
Gigabit
Ethernet 1/1
Gigabit
Ethernet
2/1
Gigabit
Ethernet 1/1
Intelligent wiring closet
Catalyst 4500 switch
To Internet
Catalyst 4500 switch
Gigabit Ethernet 1/1
Gigabit Ethernet 1/2
Gigabit
Ethernet
1/2
Gigabit
Ethernet
1/1
Trunk
link
Gigabit Ethernet 2/2
Trunk
link
Cisco IP phones
End stations
Fast Ethernet 2/7
Fast Ethernet 2/3
Fast Ethernet 2/7
Fast Ethernet 2/3
Fast Ethernet 2/5 Fast Ethernet 2/5
Cisco IP phones
Video server
172.20.10.16
94183
IP
IP
IP
IP
IP
IP
