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OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 25-1
25 Configuring QoS
The OmniSwitch software and queue management architecture provide a way to identify traffic entering
the network and manipulate flows coming through the switch. The flow manipulation (generally referred
to as
Quality of Service or QoS ) can be as simple as configuring QoS policies to allow/deny traffic or as
complicated as remapping 802.1p bits from a Layer 2 network to ToS values in a Layer 3 network.
The types of policies typically used include, but are not limited to, the following:
•
Basic QoS —includes traffic prioritization and bandwidth shaping.
•
ICMP policies —includes filtering, prioritizing, and/or rate limiting ICMP traffic for security.
•
802.1p/ToS/DSCP —includes policies for marking and mapping.
•
Policy Based Routing (PBR) —includes policies for redirecting routed traffic.
•
Policy Based Mirroring —includes mirror-to-port (MTP) policies for mirroring ingress, egress, or both
ingress and egress traffic.
•
Access Control Lists (ACLs) —ACLs are a specific type of QoS policy that is used for Layer 2 and
Layer 3/4 filtering. See “Using Access Control Lists” on page 25-63 .
This implementation of QoS integrates traffic management with QoS scheduling. Embedded profiles apply
the QoS admission control and bandwidth management configurations to traffic flows.
Data Center Bridging (DCB) protocols are also supported and implemented using embedded profiles in the
same manner that QoS profiles are applied. DCB and QoS profiles are mutually exclusive in that if the
OmniSwitch Data Center software license is installed, only DCB profiles are applied. For more informa-
tion, see
Chapter 2, “Configuring Data Center Bridging,” in the OmniSwitch AOS Release 7 Network
Configuration Guide.
In This Chapter
This chapter describes QoS in general and how policies, port-based QoS configuration, and queue
management are used on the switch. It provides information about configuring QoS through the Command
Line Interface (CLI). CLI commands are used in the configuration examples; for more details about the
syntax of commands, see the
OmniSwitch CLI Reference Guide .
The following topics and procedures are included in this chapter:
•
“QoS General Overview” on page 25-4 .
•
“Classification” on page 25-6 .
•
“Congestion Management” on page 25-10 .
•
“Congestion Avoidance” on page 25-20 .