
92 Chapter 3: Overview of QOS Support on Catalyst Platforms
In summary, the Catalyst 2900XL, 3500XL, and Catalyst 4000 CatOS Family of switches
only support a subset of QoS features compared to the Catalyst 2950, 3550, 4000 IOS, and
6500 Family of switches.
The available QoS features depend on the platform; they also depend on whether the
platform supports IP routing. The Catalyst 3550, Catalyst 4000 Cisco IOS Software Family,
Catalyst 5500 with RSM or RSFC, and the Catalyst 6000/6500 with MSM or MSFC I/II
support IP routing. Other platforms may support Layer 3 QoS features, such as classifi-
cation based on DSCP and marking of IP precedence; ho ...