Qos Configuration For The Existing Wiring Closet - Cisco Catalyst 2950 Software Configuration Manual

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Standard QoS Configuration Examples

QoS Configuration for the Existing Wiring Closet

These switches are running Cisco 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 2900 and 3500 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 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 2950 and Catalyst 2900 XL switches

and other 3500 XL models that do not have the override feature, the Catalyst 3550-12T switch at the

distribution layer can override the IEEE 802.1p CoS value by using the mls qos cos override interface

configuration command.

Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide

QoS Configuration Example Network

Existing wiring closet

shows an existing wiring closet with Catalyst 2900 XL and 3500 XL switches, for example.

Cisco router

Intelligent wiring closet

Configuring QoS

Video server

172.20.10.16

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