Qos Configuration For The Common Wiring Closet - Cisco WS-C3550-12G Software Configuration Manual

Chapter 20 Configuring QoS
Figure 20-10 QoS Configuration Example Network

QoS Configuration for the Common Wiring Closet

The common wiring closet in
These switches are running IOS release 12.0(5)XP or later, which supports the QoS-based IEEE 802.1P
CoS values. QoS classifies frames by assigning priority-indexed CoS values to them and gives
preference to higher-priority traffic.
Recall that on the Catalyst 3500 XL and 2900 XL switches, you can classify untagged (native) Ethernet
frames at the ingress ports by setting a default CoS priority (switchport priority default
default-priority-id interface configuration command) for each port. For ISL or IEEE 802.1Q frames with
tag information, the priority value from the header frame is used. On the Catalyst 3524-PWR XL
and 3548 XL switches, you can override this priority with the default value by using the switchport
priority default override interface configuration command. For Catalyst 3500 XL, 2950, other 2900
XL models that do not have the override feature, the Catalyst 3550-12T switch at the distribution layer
can override the 802.1P CoS value by using the mls qos cos override interface configuration command.
78-11194-03
Gigabit Ethernet 0/1
Existing wiring closet
Catalyst 2900 and 3500 XL
switches
End
stations
Figure 20-10
Cisco router
To Internet
Gigabit Ethernet 0/5
Catalyst 3550-12G switch
Gigabit Ethernet 0/2
Intelligent wiring closet
Catalyst 3550 switches
Trunk Trunk
link link
Gigabit
Ethernet
0/2
consists of existing Catalyst 3500 XL and 2900 XL switches.
Catalyst 3550 Multilayer Switch Software Configuration Guide
QoS Configuration Examples
Video server
172.20.10.16
Gigabit
Ethernet
0/1
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