Product guide

Quality of Service (QoS): Managing Bandwidth More Effectively
Using QoS Classifiers To Configure Quality of Service for Outbound Traffic
Values in these two
columns define the
QoS classifiers to
use for identifying
packets to prioritize.
Indicates 802.1p priority
Shows the 802.1p priority
assignments are in use for
assignment for packets
packets with 23 or 80 as a
with the indicated QoS
TCP or UDP Application
classifiers.
port number.
Figure 8-8. Example of Configuring and Listing 802.1p Priority Assignments on
TCP/UDP Ports
Assigning a DSCP Policy Based on TCP or UDP Port Number
Note The Series 5300xl and Series 4200vl switches do not support DSCP policies
on IPv4 packets with IP options. The 3400cl/6400cl switches do not support
TCP/UDP QoS policies on packets with IP options. For more information on
packet-type restrictions, refer to ‘‘Details of Packet Criteria and Restrictions
for QoS Support’’, on page 8-73.
This option assigns a previously configured DSCP policy (codepoint and
802.1p priority) to (IPv4) 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 8-8, above).
2. Overwrites (re-marks) the packet’s DSCP with the DSCP configured in
the switch for such packets.
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