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Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Indicates 802.1p priority
assignments are in use for
packets with 23 or 80 as a
TCP or UDP Application
port number.
Values in these two
columns define the
QoS classifiers to
use for identifying
packets to prioritize.
Shows the 802.1p priority
assignment for packets
with the indicated QoS
classifiers.
Figure 15-3. Example of Configuring and Listing 802.1p Priority Assignments on
TCP/UDP Ports
Assigning a DSCP Policy Based on TCP or UDP Port Number
This option assigns a previously configured DSCP policy (codepoint and
802.1p priority) to outbound TCP or UDP packets having the specified port
number. That is, the switch:
1. Selects an incoming IP packet if the TCP or UDP port number it carries
matches the port number specified in the TCP or UDP classifier (as shown
in figure
15-3, above).
2. Overwrites the packet’s DSCP with the DSCP configured in the switch for
such packets.
3. Assigns the 802.1p priority configured in the switch for the new DSCP.
(Refer to “Differentiated Services Codepoint (DSCP) Mapping” on page
15-51.)
4. Forwards the packet through the appropriate outbound port queue.
For more on DSCP, refer to “Terminology” on page 15-5.
15-16