QoS Support on the Catalyst 2900XL and 3500XL 75
Catalyst 2900XL Product Family Delineation
QoS support on the Catalyst 2900XL and 3500XL platforms is software and model
dependent. For the 2900XL, the original-edition models do not support QoS features,
including the uplink modules for the Catalyst 2916M. All standard- and enterprise-edition
models do support QoS features. Table 3-6 indicates which 2900XL models support QoS
features. All models of the 3500XL support QoS features. In addition, the Catalyst
3524XL-PWR-XL and the 3548XL support CoS reclassification. This QoS feature is not
available on other 3500XL platforms.
Catalyst 2900XL and 3500XL QoS Architectural Overview
The Catalyst 2900XL and 3500XL switches are limited to QoS features that suit access
layer switches. These features include classification, marking, and congestion management
via the use of output scheduling. Because of these features, the 2900XL and 3500XL fit
well into an end-to-end QoS design with core switches. Figure 3-2 shows a sample network
deploying access layer QoS features with comprehensive QoS features in the core.
Table 3-6 QoS Support by Model of 2900XL
Catalyst 2900XL/
3500XL Model Description
QoS
Support
WS-C2908-XL 8-port 10/100BASE-TX switch No
WS-C2912-XL-A/EN 12-port 10/100BASE-TX switch Yes
WS-C2912MF-XL 12-port 100BASE-FX switch Yes
WS-C2916M-XL 16-port 10/100BASE-TX switch + 2 uplink slots No
WS-C2924-XL 24-port 10/100BASE-TX switch No
WS-C2924C-XL 22-port 10/100BASE-TX + 2-port 100BASE-FX switch No
WS-C2924-XL-A/EN 24-port 10/100BASE-TX switch Yes
WS-C2924C-XL-A/EN 22-port 10/100BASE-TX switch + 2-port 100BASE-FX
switch
Yes
WS-C2924M-XL-A/EN 24-port 10/100BASE-TX switch + 2 uplink slots Yes
WS-C2924M-XL-EN-DC 24-port 10/100BASE-TX switch + 2 uplink slots (DC
power)
Yes