IBM i Version 7.2 Networking Quality of service IBM Note Before using this information and the product it supports, read the information in “Notices” on page 67. This document may contain references to Licensed Internal Code. Licensed Internal Code is Machine Code and is licensed to you under the terms of the IBM License Agreement for Machine Code. © Copyright International Business Machines Corporation 1998, 2013. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents Quality of service...................................................................................................1 PDF file for Quality of service.......................................................................................................................1 Concepts.......................................................................................................................................................1 Differentiated service............................................................................................................................. 2 Integrated service.................................................................................................................................. 6 Inbound admission policy....................................................................................................................11 Class of service.....................................................................................................................................12 Quality of service APIs......................................................................................................................... 16 Directory server....................................................................................................................................24 Scenarios: Quality of service policies........................................................................................................27 Scenario: Limiting browser traffic........................................................................................................27 Scenario: Secure and predictable results (VPN and QoS)...................................................................31 Scenario: Limiting inbound connections..............................................................................................35 Scenario: Predictable B2B traffic.........................................................................................................37 Scenario: Dedicated delivery (IP telephony).......................................................................................41 Scenario: Monitoring current network statistics................................................................................. 44 Planning for quality of service................................................................................................................... 46 Authority requirements........................................................................................................................46 System requirements........................................................................................................................... 47 Service level agreement.......................................................................................................................47 Network hardware and software......................................................................................................... 48 Configuring quality of service.................................................................................................................... 49 Configuring QoS with wizards.............................................................................................................. 49 Configuring directory server.................................................................................................................51 Ordering QoS policies...........................................................................................................................52 Managing quality of service....................................................................................................................... 52 Accessing QoS help in System i Navigator...........................................................................................53 Backing up QoS policies.......................................................................................................................53 Copying an existing policy....................................................................................................................53 Editing QoS policies..............................................................................................................................54 Monitoring QoS..................................................................................................................................... 54 Troubleshooting quality of service............................................................................................................ 59 Journaling QoS policies........................................................................................................................60 Logging QoS server jobs....................................................................................................................... 61 Monitoring system transactions...........................................................................................................61 Trace TCP applications.........................................................................................................................62 Related information for Quality of service................................................................................................ 65 Notices................................................................................................................67 Programming interface information.......................................................................................................... 68 Trademarks................................................................................................................................................ 69 Terms and conditions.................................................................................................................................69 iii iv Quality of service The IBM® i quality of service (QoS) solution enables the policies to request network priority and bandwidth for TCP/IP applications throughout the network. All traffic in your network receives equal priority. Noncritical browser traffic is considered as important as critical business applications. If your chief executive officer (CEO) is giving a presentation using an audio/ video application, IP packet priority becomes a concern. It is critical that, during the presentation, this application receives greater performance than other applications. Packet priority is important to you if you send applications that need predictable and reliable results, such as multimedia. QoS policies can manage packet priority and can also limit data leaving your system, manage connection requests, and control system load. The QoS server must be running to activate the intrusion detection policy. PDF file for Quality of service You can view and print a PDF file of this information. To view or download the PDF version of this document, select Quality of service (about 525 KB). Saving PDF files To save a PDF on your workstation for viewing or printing: 1. Right-click the PDF link in your browser. 2. Click the option that saves the PDF locally. 3. Navigate to the directory in which you want to save the PDF. 4. Click Save. Downloading Adobe Reader You need Adobe Reader installed on your system to view or print these PDFs. You can download a free copy from the Adobe Web site (www.adobe.com/products/acrobat/readstep.html) . Related reference Related information for Quality of service Quality of service Request for Comments, IBM Redbooks publications, and other information center topic collections contain information that relates to the Quality of service topic collection. You can view or print any of the PDF files. Concepts Before using quality of service (QoS), you need to learn the basic terminology and QoS concepts. These concepts help you determine whether the service meets your needs. To carry out QoS, you configure policies using wizards in System i® Navigator. A policy is a set of rules that designate an action. The policy basically states which client, application, and schedule (that you designate) must receive a particular service. You can ultimately configure the following policy types: • Differentiated service • Integrated service • Inbound admission Differentiated service and integrated service are considered outbound bandwidth policies. Outbound policies limit data leaving your network and help control system load. The rates you set within an © Copyright IBM Corp. 1998, 2013 1 outbound policy control how and what data is or is not limited within the system. Both outbound policy types might require a service level agreement (SLA) with your Internet service provider (ISP). Inbound admission policies control the connection requests coming into your network from some outside sources. Inbound policies are not dependent on a service level from your ISP. To decide which policy you need to use, evaluate the reasons why you want to use QoS and consider the role of your system. One of the