82 Chapter 3: Overview of QOS Support on Catalyst Platforms
QoS Support on the Catalyst 4000 CatOS Family of
Switches
Catalyst 4000 CatOS switches provide for QoS classification and congestion management
solely based on CoS values. The Catalyst 4000 IOS switches, discussed in Chapter 7,
support a wider range of QoS. For the Catalyst 4000 CatOS switches, a high- and low-
priority transmit port queue with round-robin scheduling accomplish congestion
management. The Catalyst 4000 CatOS switches do not support policing or input sched-
uling. The following sections discuss the Catalyst 4000 CatOS QoS features with detailed
overviews, configuration guidelines, and examples.
Catalyst 4000 Product Family Delineation
This section covers the Catalyst 4000 CatOS Family of switches. As discussed in the intro-
duction to this chapter, the Catalyst 4000 Cisco IOS switches, the Catalyst 4000 CatOS
switches, and the Layer 3 services module each have unique QoS feature support. The
Catalyst 4000 Cisco IOS switches and the Layer 3 services module are covered in Chapter 7.
Table 3-8 summarizes the Catalyst 4000 switches into the CatOS or IOS category. This
chapter applies to the Catalyst 4000 switches that run CatOS Software.
Table 3-8 Catalyst 4000 CatOS Versus Cisco IOS Software Platform Support
Catalyst 4000 Model Family Description Software
Catalyst 2948G Catalyst 4000 48-port 10/100BASE-TX switch ports + 2
1000BASE-X GBIC* switch ports
CatOS
Catalyst 2980G Catalyst 4000 80-port 10/100BASE-TX switch ports + 2
1000BASE-X GBIC switch ports
CatOS
Catalyst 2980G-A Catalyst 4000 80-port 10/100BASE-TX switch ports + 2
1000BASE-X GBIC switch ports
CatOS
Catalyst 2948G-L3 Catalyst G-L3 48-port 10/100BASE-TX + 2 1000BASE-X
GBIC Layer 3 switch
IOS
Catalyst 4003 + WS-X4012
Supervisor I Engine
Catalyst 4000 3-slot modular chassis + 2 1000BASE-X GBIC
ports on Layer 2 supervisor
CatOS
Catalyst 4006 + WS-X4013
Supervisor II Engine
Catalyst 4000 6-slot modular chassis + 2 1000BASE-X GBIC
ports on Layer 2 supervisor
CatOS
Catalyst 4006 + WS-X4014
Supervisor III Engine
Catalyst 4000 6-slot modular chassis + 2 1000BASE-X GBIC
ports on Layer 2/3 supervisor
IOS
Catalyst 4006 + WS-X4515
Supervisor IV Engine
Catalyst 4000 6-slot modular chassis + 2 1000BASE-X GBIC
ports on Layer 2/3 supervisor
IOS
Catalyst WS-X4232-L3
Layer 3 Services Module
Catalyst G-L3 Layer 3 router module for Catalyst 4003 and
4006 chassis with Supervisor I or II Engine
IOS