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CHAPTER
63-1
User Guide for Cisco Security Manager 4.4
OL-28826-01
63
Configuring Quality of Service
This chapter contains the following topics:
• Quality of Service on Cisco IOS Routers, page 63-1
• Quality of Service Policy Page, page 63-19
Quality of Service on Cisco IOS Routers
Quality of service (QoS) refers to the ability of a network to provide priority service to selected network
traffic over various underlying technologies, including Frame Relay, ATM, Ethernet and 802.1 networks,
SONET, and IP-routed networks. QoS features enhance the predictability of network service by:
• Supporting dedicated bandwidth.
• Improving loss characteristics.
• Avoiding and managing network congestion.
• Shaping network traffic.
• Setting traffic priorities across the network.
QoS is generally used at entry points to service providers, as well as at consolidation points where
multiple lines converge. QoS is also useful where speed mismatches occur (for example, at the boundary
between a WAN and a LAN), as these places are often traffic congestion points.
QoS policies in Security Manager are based on the Cisco Systems Modular QoS CLI (MQC). MQC
standardizes the CLI and semantics for QoS features across all platforms supported by Cisco IOS
software, which provides a modular and highly extensible framework for deploying QoS. Security
Manager provides an easy-to-use interface for MQC that concentrates key QoS features inside a single
dialog box, streamlining the creation of QoS policies for selected traffic entering and leaving the router.
For a description of the procedure for defining a QoS policy in Security Manager, see Defining QoS
Policies, page 63-10.
Related Topics
• Quality of Service and CEF, page 63-2
• Understanding Marking Parameters, page 63-3
• Understanding Queuing Parameters, page 63-4
• Understanding Policing and Shaping Parameters, page 63-6