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Configuring QoS Policy Applications

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 26-51

Policy Applications

Policies are used to classify incoming flows and treat the relevant outgoing flows. There are many ways to

classify the traffic and many ways to apply QoS parameters to the traffic.

Classifying traffic may be as simple as identifying a Layer 2 or Layer 3 address of an incoming flow.

Treating the traffic might involve prioritizing the traffic or rewriting an IP address. How the traffic is

treated (the action in the policy rule) typically defines the type of policy:

This section describes how to configure basic QoS policies and 802.1p/ToS/DSCP marking and mapping

policies. Policies used for Layer 2 and Layer 3/4 filters, are commonly referred to as Access Control Lists

(ACLs). Filtering is discussed in Chapter 27, “Configuring ACLs.”

Policies may also be used for prioritizing traffic in dynamic link aggregation groups. For more informa-

tion about dynamic link aggregates, see Chapter 14, “Configuring Dynamic Link Aggregation.”

Basic QoS Policies

Traffic prioritization and bandwidth shaping may be the most common types of QoS policies. For these

policies, any condition may be created; the policy action indicates how the traffic should be prioritized or

how the bandwidth should be shaped.

Type of Policy Description Action Parameters Used

Basic QoS policies Prioritizes particular flows, and/

or shapes the bandwidth for the

flow

maximum bandwidth

priority

Redirection policies Redirects flows to a specific port

or link aggregate ID.

redirect port

redirect linkagg

ICMP policies Filters, prioritizes, and/or rate

limits ICMP traffic

disposition

priority

maximum bandwidth

802.1p, ToS, and DSCP tagging or

mapping policies

Sets or resets the egress 802.1p,

ToS, or DSCP values

802.1p

tos

dscp

map group

Policy Based Routing (PBR) Redirects routed traffic permanent ip

Access Control Lists (ACLs) Groups of policies rules used for

filtering traffic (allow/deny)

disposition

OmniSwitch

ingress flow

queues for egress traffic

policy condition

classifies the flow

policy action determines

how packets are queued

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