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Quality of Service (QoS): Managing Bandwidth More Effectively
Preparation for Configuring QoS
2. Select the QoS option you want to use. Table 15-6 lists the traffic types
(QoS classifiers) and the QoS options you can use for prioritizing or
setting a policy on these traffic types:
Table 15-6. 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
L3
Protocol
VLAN
-ID
Source
-Port
Option 1:
Set 802.1p
Priority
Only
Prioritize traffic by sending specific
packet types (determined by QoS
classifier) to different outbound port
queues on the switch.
Rely on tagged VLANs to carry
packet priority as an 802.1p value to
downstream devices.
Yes Yes Yes
1
Yes Yes Yes Yes
Option 2:
Configure
ToS DSCP
Policy
with
802.1p
Priority
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.
(Assumes that downstream devices
can be configured to recognize the
DSCP in IP packets and implement
the service policy it indicates.)
Use tagged VLANs to carry packet
priority as an 802.1p value to
downstream devices.
Yes Yes No Yes No 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 802.1p priority settings to be included in outbound packets,
ensure that tagged VLANs are configured on the appropriate 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.
No t e If you use TopTools for Hubs & Switches to configure QoS policy in a network,
it overrides any QoS settings configured through the CLI or the web browser
interface in any individual HP switch.
15-12