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3.5: Implementing QoS with Cisco AutoQoS

© 2006 Cisco Systems, Inc. All rights reserved.

Objectives Describe LAN and WAN features of Cisco AutoQoS.

Identify the guidelines when using Cisco AutoQoS to implement QoS policies.

Describe the features of the Cisco Security Device Manager (SDM).

Explain how SDM can be used to implement QoS on Cisco devices.

Compare and contrast four methods for configuring QoS on a network.

© 2006 Cisco Systems, Inc. All rights reserved.

Cisco AutoQoS

© 2006 Cisco Systems, Inc. All rights reserved.

Cisco AutoQoS Features in a WAN

Feature Benefit

Autodetermination of WAN Settings

Eliminates the need to know QoS theory and design in common deployment scenarios

Autoclassification of VoIP Settings

Automatically classifies RTP payload and VoIP control packets (H.323, H.225 unicast, Skinny, SIP), and MGCP

Initial Policy Generation

Reduces the time needed to establish an initial, feasible QoS policy solution

VoIP LLQ Provisioning

Provisions LLQ for the VoIP bearer and bandwidth guarantees for control traffic

WAN Traffic Shaping

Enables WAN traffic shaping (FRTS, CIR and burst)

Link Efficiency Enables link efficiency mechanisms (LFI and cRTP) as appropriate

Management Provides SNMP and syslog alerts for VoIP packet drops

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Cisco AutoQoS Features in a LAN

Feature Benefit

Simplified Configuration

One-command voice configuration does not affect other network traffic. Can be fine tuned.

Queue Configuration

Configures queue admission criteria, Cisco Catalyst strict-priority queuing with WRR scheduling, modifies queue sizes and weights.

Automated & Secure

Detects Cisco IP Phones and enables AutoQoS settings. Protects against malicious activity during Cisco IP phone relocations and moves.

Optimal VoIP Performance

Leverages decades of networking experience and uses all advanced QoS capabilities of the Cisco Catalyst switches.

End-to-End Interoperability

Works with AutoQoS settings on all other Cisco switches and routers.

Trust Boundary Enforcement

Enforces the trust boundary on Cisco Catalyst switch access ports, uplinks, and downlinks

NBAR Support Enables NBAR for different traffic types

© 2006 Cisco Systems, Inc. All rights reserved.

Cisco AutoQoS Use Guidelines Make sure that:

Any QoS configurations on the WAN interface are removed.

CEF is enabled.

NBAR is enabled.

Correct bandwidth statement is configured on the interface.

Cisco AutoQoS is enabled on the interface.

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Cisco AutoQoS Example

Enable Cisco AutoQoS on relevant devices (such as LAN switches and WAN routers) that need to perform QoS.

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Cisco AutoQoS Example (Cont.)

interface Serial1/3 ip cef bandwidth 1540 ip address 10.10.100.1 255.255.255.0 auto qos voip

IP CEF and Bandwidth

AutoQoS for VoIP Traffic Recognized by NBAR

© 2006 Cisco Systems, Inc. All rights reserved.

Cisco Security Device Manager (SDM)

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Steps 1 to 4: Creating a QoS Policy

1.

2.

3.

4.

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Step 5: Launching the QoS Wizard

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Step 6: Selecting the Interface

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Step 7: Generating a QoS Policy

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Reviewing the QoS Configuration

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Completing the Configuration: Command Delivery Status

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Monitoring QoS Status

1.

2.

A

B

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Comparing QoS Implementation Methods

Legacy CLI MQCCisco

AutoQoSCisco SDM QoS Wizard

Ease of use PoorModerately

easySimple Simple

Ability to fine-tune

Acceptable Very good Limited Limited

Time to implement

Longest Average Shortest Short

Modularity Poor Excellent Excellent Very good

© 2006 Cisco Systems, Inc. All rights reserved.

Network-Based Application Recognition(NBAR)

•NBAR is a new classification engine in Cisco IOS® Software that can recognize a wide variety of applications

•Including Web-based applications and client/server applications that dynamically assign TCP or User Datagram Protocol (UDP) port numbers

•After the application is recognized, the network can invoke specific services for that particular application.

•NBAR currently works with quality-of-service (QoS) features to help ensure that the network bandwidth is best used to fulfil your business objectives.

© 2006 Cisco Systems, Inc. All rights reserved.

Why NBAR is used

•Today's applications require high performance to help ensure competitiveness in an increasingly fast-paced business environment.

•The network can provide a variety of services to help ensure that your mission-critical applications receive the bandwidth they need to provide this performance.

•The difficulty is that today's Internet-based and client-server applications make it difficult for the network to identify and provide the proper level of control you need.

•NBAR solves this problem by adding intelligent network classification to your infrastructure.

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NBAR fits into the Content Networking framework

•NBAR provides intelligent network classification that can be used to determine which services the network should provide.

•NBAR currently works with QoS features so that one can provide differentiated classes of service (CoSs) to different applications.

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Advantages of NBAR

•Help Ensure Performance for Mission-Critical Applications

•Reduce WAN Expenses

•Manage Web Response

•Improve VPN Performance

•Improve Multiservice Performance

© 2006 Cisco Systems, Inc. All rights reserved.

Summary Cisco AutoQoS simplifies and shortens the QoS deployment cycle.

Cisco AutoQoS helps in all of the five major aspects of successful QoS deployments.

Cisco AutoQoS simplifies deployment and speeds provisioning of Quality of Service technology over a Cisco network infrastructure. It reduces human error and lowers training costs.

Cisco Security Device Manager (SDM) is an intuitive, web-based device management tool that was created for easy and reliable deployment and management of Cisco IOS routers.

NBAR is Software that can recognize a wide variety of applications, including Web-based applications and client/server applications that dynamically assign TCP or User Datagram Protocol (UDP) port numbers.

After the application is recognized, the network can invoke specific services for that particular application.