HP 2610-PWR - Manual (Page 204)

Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
For more on how QoS operates with the preceding traffic types, see
‘‘Precedence Criteria for QoS Classifiers’’, on page 6-11.)
2. Select the QoS option you want to use. Table 6-7 lists the traffic types (QoS
classifiers) and the QoS options you can use for prioritizing or setting a
policy on these traffic types:
Table 6-7. Applying QoS Options to Traffic Types Defined by QoS Classifiers
QoS Options for Prioritizing Outbound Traffic QoS Classifiers
UDP/
TCP
IP
Device
IP-ToS
Precedence
IP-
DiffServ
VLAN
-ID
Source
-Port
Option 1:
Configure
802.1p
Priority
Rules Only Prioritize traffic by sending specific packet types
(determined by QoS classifier) to different
outbound port queues on the switch.
Rely on VLAN-tagged ports to carry packet
priority as an 802.1p value to downstream
devices. Yes Yes Yes
1
Yes Yes Yes
Option 2:
Configure
ToS DSCP
Policies
with
802.1p
Priorities Prioritize traffic by sending specific packet types
(determined by QoS classifier) to different
outbound port queues on the switch.
Propagate a service policy by reconfiguring the
DSCP in outbound 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. Yes Yes No Yes Yes Yes
1
In this mode the configuration is fixed. You cannot change the automatic priority assignment when using IP-ToS
Precedence as a QoS classifier.
3. If you want to include 802.1p priority settings 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
DSCPs in IP packets from the switch, configure them to do so by enabling
ToS Differentiated Service mode and making sure the same DSCP policies
are configured.
5. Before configuring QoS on a switch, refer to the next section, “Planning
a QoS Configuration” for information on per-port QoS resource use.
6-14