OmniSwitch os6900, Network Configuration Manual, Page: 631 / 942

Configuring QoS Traffic Policing and Shaping
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 25-23
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QoS bandwidth policy actions . Maximum bandwidth and depth policy actions are used in QoS policy
rules to specify a maximum ingress bandwidth rate and bucket size. See “Configuring Policy Band-
width Policing” on page 25-26 for more information.
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E-Services bandwidth parameters . The VLAN Stacking Service Access Point (SAP) profile defines
an ingress and egress bandwidth rate limiting configuration for an Ethernet Service. See Chapter 33,
“Configuring VLAN Stacking,” for more information.
Shaping
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Port-based QoS bandwidth shaping . The QoS CLI provides two commands for setting the maxi-
mum ingress and egress bandwidth for a specific port. These QoS port parameters define the rate at
which traffic is received and sent on the specified port. See
“Configuring Policy Bandwidth Policing”
on page 25-26 .
•
Queue bandwidth shaping . This type of shaping is implemented through the virtual output queue
architecture of the switch. A set of VOQs for each port (QSet) is associated with a profile that defines
and applies the shaping and scheduling configuration for each VOQ in the QSet. See
“Congestion
Management” on page 25-10 for more information.
Tri-Color Marking
This implementation of a Tri-Color Marking (TCM) provides a mechanism for policing network traffic by
limiting the rate at which traffic is sent or received on a switch interface. The TCM policier meters traffic
based on user-configured packet rates and burst sizes and then marks the metered packets as green,
yellow, or red based on the metering results.
The following diagram illustrates the basic operation of TCM:
The TCM policier meters each packet and passes the metering result along with the packet to the Marker.
Depending upon the result sent by the Meter, the packet is then marked with either the green, yellow, or
red color. The marked packet stream is then transmitted on the egress based on the color-coded priority
assigned.
The TCM Meter operates in Color-Blind mode (the Color-Aware mode is not supported). In the Color-
Blind mode, the Meter assumes that the incoming packet stream is uncolored.
There are two types of TCM marking supported:
•
Single-Rate TCM (srTCM)—Packets are marked based on a Committed Information Rate (CIR) value
and two associated burst size values: Committed Burst Size (CBS) and Peak Burst Size (PBS).