ProCurve 2610-PWR Technical Information download pdf (Page 205)

Quality of Service (QoS): Managing Bandwidth More Effectively

Preparation for Configuring QoS

Planning a QoS Configuration

QoS uses resources in a way that requires attention to rule usage when

planning a QoS configuration. Otherwise, there is an increased possibility of

oversubscribing resources, which means that at some point the switch would

not support further QoS configuration.

Prioritizing and Monitoring QoS Configuration Options

Plan and implement your QoS configuration in descending order of feature

importance. This helps to ensure that the most important features are

configured first. Also, if insufficient rule resources become a problem, this

approach can help you recognize how to distribute the desired feature

implementations across multiple switches to achieve your objectives. For

example, a given type of traffic may be of higher importance than other traffic

types you want to expedite by using QoS. In this case you should plan and

configure your QoS resource usage first for the most important traffic type

before configuring QoS resource usage for other traffic types. If insufficient

resources remain for all of the QoS implementation you want, try spreading

this implementation across multiple switches.

Policy Enforcement Engine

The Policy Enforcement engine is the hardware element in the switch that

manages quality-of-service and ACL policies, as well as other software fea-

tures, using the rules that you configure. Resource usage in the Policy Enforce-

ment engine is based on how these features are configured on the switch. For

the switches covered in this guide, the term “resources” refers to the Policy

Enforcement Engine resources available to that feature.

QoS Resource Usage and Monitoring

QoS configurations on the switches covered in this guide use rule resources

as shown in Table 6-8. (How many resources are actually available depends

on ACL usage as well.)

Table 6-8. QoS Rule Resource Usage

QoS Classifier Rules Used

TCP and UDP Qos 2 per TCP or UDP Application

Device Priority QoS 2 per IP Address

ToS IP-Precedence 8 rules total per switch if this feature is enabled

QoS

6-15

1 2 ... 200 201 202 203 204 205 206 207 208 209 210 ... 363 364

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ProCurve 2610-PWR Technical Information Page 205