Cisco CiscoWork QoS Policy Manager 4.1.2 User Guide
Chapter 2 Planning for Quality of Service
What Types of Quality of Service Does QPM Handle?
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User Guide for QoS Policy Manager 3.0
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Note
Packet marking can also be defined as part of a policing policy. In these cases,
QPM uses Committed Access Rate (CAR) or MQC policing. See
QPM uses Committed Access Rate (CAR) or MQC policing. See
for more information.
After you mark packets, you can define queuing, shaping, and policing policies
that filter by marking value to create differentiated services.
that filter by marking value to create differentiated services.
Note
Some scheduling methods automatically prioritize traffic according to packet
marking, and you do not need to deploy specific queuing policies for interfaces
using those queuing methods.
marking, and you do not need to deploy specific queuing policies for interfaces
using those queuing methods.
Related Topics
•
Traffic Policing for Limiting Bandwidth and Marking Traffic
Traffic policing allows you to control the rate of traffic sent or received on an
interface. Traffic policing is often configured on interfaces at the edge of a
network to limit traffic into or out of the network.
interface. Traffic policing is often configured on interfaces at the edge of a
network to limit traffic into or out of the network.
You can specify one of the following actions for traffic that conforms to or
exceeds the specified rate (depending on the type of policing):
exceeds the specified rate (depending on the type of policing):
•
Transmit—The packet is sent.
•
Drop—The packet is discarded.
•
Mark and transmit—The ToS bits in the packet header are rewritten. The
packet is then sent.
packet is then sent.
•
Markdown—This reduces the packets’ IP precedence or DSCP values
according to a predefined markdown mapping table.
according to a predefined markdown mapping table.
One of the main uses for policing policies is to ensure that traffic coming into your
network does not exceed agreed-upon rates. If you define a policing policy for
inbound traffic, you can throttle misbehaving traffic before it gets into your
network. Because you control the traffic’s rate at the inbound interface, the traffic
should be well-behaved while it is in your network.
network does not exceed agreed-upon rates. If you define a policing policy for
inbound traffic, you can throttle misbehaving traffic before it gets into your
network. Because you control the traffic’s rate at the inbound interface, the traffic
should be well-behaved while it is in your network.