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Quality of Service: Managing Bandwidth More Effectively
Globally-Configured QoS
Global Source-Port Classifier
Global QoS Classifier Precedence: 6
The global QoS source-port classifier allows you to use a packet’s source-port
on the switch to mark packets. When a global source-port classifier has the
highest precedence in the switch for traffic entering through a port, traffic
received on the port is marked with the configured priority level. Different
source-port classifiers can have different priority levels.
Options for Assigning Priority on the Switch. The global QoS packet-
marking options for matching packets from a specified source-port include:
■ 802.1p priority
■ DSCP policy: Assigning a new DSCP and an associated 802.1p priority
For information on QoS operation when other global QoS classifiers match
the same traffic, see to “Globally-Configured Packet Classification” on page
5-9.
Options for Assigning Priority From a RADIUS Server. You can use a
RADIUS server to assign a QoS source-port priority during an 802.1X port-
access authentication session. Refer to the RADIUS chapter in the Access
Security Guide for your switch.
Assigning a Priority for a Global Source-Port Classifier
This global QoS packet-marking option assigns a priority to all outbound
packets having the specified source-port. You can configure this option by
either specifying the source-port ahead of the qos command or moving to the
port context for the port you want to configure for priority. (If you are
configuring multiple source-ports with the same priority, you may find it easier
to use the interface < port-list > command to go to the port context instead of
individually configuring the priority for each port.)
Syntax: interface < port-list > qos priority < 0 - 7 >
Configures an 802.1p priority for packets entering the
switch through the specified (source) ports. This priority
determines the packet queue in the outbound port(s) to which
traffic is sent. If a packet leaves the switch on a tagged port,
it carries the 802.1p priority with it to the next downstream
device. You can configure one QoS classifier for each source-
port or group of source-ports. (Default: No-override)
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