Advanced Traffic Management Guide K/KA/KB.15.15

Maximum global QoS remarking entries
The switches covered in this guide accept the maximum number of configured outbound 802.1p
priority and DSCP entries shown in the following table.
Table 21 Maximum number of QoS entries.
NotesMaximum QoS remarkingSwitch
3800 Switches
• Each IP Device (IP address) QoS
configuration uses two entries.
250
1
configured entriesSwitch 8212zl Series
5400zl
• Each TCP/UDP Port QoS configuration
uses two entries.
Series 5300yl
• All other global QoS classifier
configurations use one entry each.
1
Configuring IP Device (IP address) and TCP/UDP global QoS classifiers reduces this maximum. For more information,
see the Notes column.
If the global QoS configurations on a switch exceed the maximum number of entries shown in
Table 21 (page 246), the following error message is displayed:
Unable to add this QoS rule. Maximum number (entry-#:) already
reached.
Not supported
Use of an inbound 802.1p packet priority as a classifier for remapping a packet's outbound priority
to different 802.1p priority. For example, where inbound packets carry an 802.1p priority of 1,
QoS cannot be configured use this priority as a classifier for changing the outbound priority to 0.
Fragmented packets and TCP/UDP
QoS is not performed on fragmented packets under TCP/UDP.
Monitoring shared resources
The QoS feature shares internal switch resources with several other features. The switch provides
ample resources for all features. However, if the internal resources become fully subscribed,
additional QoS provisions cannot be configured until the necessary resources are released from
other uses. For information on determining the current resource availability and usage, see the
Management and Configuration Guide for your switch.
Global QoS classifiers
Global TCP/UDP classifier
Global QoS classifier precedence: 1
When you use TCP or UDP and a Layer 4 Application port number as a global QoS classifier,
traffic carrying the specified TCP/UDP port numbers is marked with a specified priority level,
without regard for any other QoS classifiers in the switch. You can configure up to 50 TCP/UDP
application port numbers as QoS classifiers.
NOTE: Starting in software release K.14.01, global TCP/UDP classifiers are supported on IPv4,
IPv6, or both IPv4 and IPv6 packets. In previous releases, only IPv4 packets were supported.
246 Quality of Service: Managing bandwidth effectively