Cisco CiscoWork QoS Policy Manager 4.1.2 User Guide
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User Guide for QoS Policy Manager 3.0
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Chapter 2 Planning for Quality of Service
What Types of Quality of Service Does QPM Handle?
Managing Traffic Through Access Control
You can control traffic access by permitting or denying transport of packets into
or out of interfaces.
or out of interfaces.
You can define access control policies, which will deny or permit traffic that
matches the filter definition in the specified direction. You can also define a filter
condition to deny specific types of traffic as part of a QoS policy definition.
matches the filter definition in the specified direction. You can also define a filter
condition to deny specific types of traffic as part of a QoS policy definition.
The access control feature can be used as a security feature, and can be enabled
or disabled globally for all databases in your system. You can overwrite the global
configuration on a per-domain or per-device basis.
or disabled globally for all databases in your system. You can overwrite the global
configuration on a per-domain or per-device basis.
You cannot create Access Control policies for the Cisco 8500 family of devices
or for Catalyst switches.
or for Catalyst switches.
Signaling Techniques
To implement end-to-end quality of service, a traffic flow must contain or use
some type of signal to identify the requirements of the traffic. With QPM, you can
control these types of signaling techniques:
some type of signal to identify the requirements of the traffic. With QPM, you can
control these types of signaling techniques:
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IP Precedence and DSCP Values: Differentiated Services
The simplest form of signal is the IP precedence or DSCP setting in data packets:
the packet’s color or classification.
the packet’s color or classification.
This signal is carried with the packet, and can affect the packet’s handling at each
node in the network. Queuing techniques such as WFQ and WRED automatically
use this signal to provide differentiated services to high-priority traffic.
node in the network. Queuing techniques such as WFQ and WRED automatically
use this signal to provide differentiated services to high-priority traffic.
To use the IP precedence or DSCP setting effectively, ensure that you mark traffic
at the edges of your network so that the marking affects the packet’s handling
throughout the network. See
at the edges of your network so that the marking affects the packet’s handling
throughout the network. See
, for information on how to
change a packet’s IP precedence or DSCP setting.