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 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 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
8-70.
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.
8-26
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