HP ProCurve 5300xl Series Management Manual page 288

Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
Table 8-8. Applying QoS Options to Traffic Types Defined by QoS Classifiers
QoS Options for Prioritizing Outbound Traffic
Option 1: Prioritize traffic by sending specific
Configure packet types (determined by QoS
802.1p classifier) to different outbound port
Priority queues on the switch.
Rules Only
Rely on VLAN-tagged ports to carry
packet priority as an 802.1p value to
downstream devices.
Option 2: Prioritize traffic by sending specific
Configure packet types (determined by QoS
ToS DSCP classifier) to different outbound port
Policies queues on the switch.
with
Propagate a service policy by
802.1p
reconfiguring the DSCP in outbound
Priorities
IP packets according to packet type.
The packet is placed in an outbound
port queue according to the 802.1p
priority configured for that DSCP
policy. (The policy assumes that
downstream devices can be
configured to recognize the DSCP in
IP packets and implement the
service policy it indicates.)
Use VLAN-tagged ports to include
packet priority as an 802.1p value to
downstream devices.
1
In this mode the configuration is fixed. You cannot change the automatic priority assignment when using IP-ToS
Precedence as a QoS classifier.
2
Not available on the 3400cl/6400cl switches.
8-14
For more on how QoS operates with the preceding traffic types, see
''Precedence Criteria for QoS Classifiers'', on page 8-11.)
2. Select the QoS option you want to use. Table 8-8 lists the traffic types (QoS
classifiers) and the QoS options you can use for prioritizing or setting a
policy on these traffic types:
UDP/
TCP
Yes
Yes
3. If you want 802.1p priority settings to be included in outbound packets,
ensure that tagged VLANs are configured on the appropriate downstream
links.
4. Determine the actual QoS configuration changes you will need to make
on each QoS-capable device in your network in order to implement the
desired policy. Also, if you want downstream devices to read and use
QoS Classifiers
IP IP-ToS
Device Precedence DiffServ
1
Yes Yes
Yes No
IP- L3 VLAN
Protocol -ID
2
Yes Yes Yes
Yes No Yes
Source
-Port
Yes
Yes