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Cisco7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter42 Con figuring PFC QoS
Common QoS Scenarios
This example shows how to set the transmit-queue size ratio for Gigabit Ethernet port 1/2:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# interface gigabitethernet 1/2
Router(config-if)# wrr-queue queue-limit 75 15
Router(config-if)# end
Router#
This example shows how to verify the configuration:
Router# show queueing interface gigabitethernet 1/2 | include queue-limit
queue-limit ratios: 75[queue 1] 25[queue 2]
Router#
Common QoS Scenarios
This section provides sample configurations for some common QoS scenarios. If you already know how
to configure PFC QoS for your network or if you need specific configuration information, see the other
sections of this chapter.
The scenarios in this section are based on a sample network that is described in the “Sample Network
Design Overview” section on page42-112. This s ection uses this sample network to describe some
regularly used QoS configurations.
These sections describe some common QoS scenarios:
Sample Network Design Overview, page 42-112
Classifying Traffic from PCs and IP Phones in the Access Layer, page 42-113
Accepting the Traffic Priority Value on Interswitch Links, page 42-116
Prioritizing Traffic on Interswitch Links, page 42-117
Using Policers to Limit the Amount of Traffic from a PC, page 42-120

Sample Network Design Overview

This sample network is based on a traditional campus network architecture that uses Catalyst 6500 series
switches in the access, distribution, and core layers. The access layer provides 10/100 Ethernet service
to desktop users. The network has Gigabit Ethernet links from the access layer to the distribution layer
and Gigabit or 10 Gigabit Ethernet links from the distribution layer to the core layer.
This is the basic port configuration:
Access Layer
switchport mode access
switchport access vlan 10
switchport voice vlan 110
Distribution and Core Interswitch Links
switchport mode trunk