HP ProCurve Series 2810 Management And Configuration Manual page 162

Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
QoS Options for Prioritizing Outbound Traffic
Option 1: Prioritize traffic by sending specific packet types
Configure (determined by QoS type) to different outbound
802.1p port queues on the switch.
Priority
Rely on VLAN-tagged ports to carry packet
Rules Only
priority as an 802.1p value to downstream
devices.
Option 2: Prioritize traffic by sending specific packet types
Configure (determined by QoS type) to different outbound
ToS DSCP port queues on the switch.
Policies
Propagate a service policy by reconfiguring the
with
DSCP in outbound IP packets according to
802.1p
packet type. The packet is placed in an outbound
Priorities
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 type.
6-14
2. Select the QoS option you want to use. Table 6-7 lists the traffic types (QoS
types) 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 Types
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.
QoS Types
UDP/ IP IP-ToS
TCP Device Precedence
1
Yes Yes Yes
Yes Yes No
VLAN Source
-ID -Port
Yes Yes
Yes Yes