IBM AS/400 manual Networking concepts, Advanced Peer-to-Peer Networking

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Chapter 9. Networking concepts

If you would like more information on networking topics, review the following:

vAdvanced Peer-to-Peer Networking support

vAdvanced Program-to-Program Communications

vDependent LU Requester Support (DLUR)

vHigh-performance routing (HPR)

vInternet packet exchange support

vSystems Network Architecture

vTCP/IP

Advanced Peer-to-Peer Networking

Advanced Peer-to-Peer Networking (APPN) is one type of data communications support that is provided by the AS/400 system. This support routes data in a network between two or more advanced program-to-program systems. The systems do not need to be directly connected in the same network or adjacent networks.

The APPC/APPN support handles all of the SNA protocol requirements when your system is communicating with a remote system that uses the LU session type 6.2 and node type 2.1 architectures. The remote system can be any of the following systems:

vAS/400 system

vSystem/36

vSystem/38

vIBM personal computer

vDisplaywriter

vSeries/1

v5520 Administrative System

vRISC System/600 (Reduced Instruction Set Computer)

vDPPX/370 (Distribute Processing Programming Executive

vOne of the following host systems:

System/370

System/390

30XX processor

43XX processor

9370 system

Another system that supports the appropriate level of architecture

The AS/400 APPN support is an enhancement to the SNA Node Type 2.1 architecture that supplies networking functions. These enhancements are easy-to-use, are dynamic; and give control of the network to the peer systems that make up the network. APPN provides you with the following advanced functions:

vDistributed directory services

vDynamic route selection that is based on user-specified values

vIntermediate session routing

vRouting of data by using transmission priorities.

With the exception of intermediate session routing, HPR builds on and uses these APPN functions. For more information on HPR, see high-performance routing.

© Copyright IBM Corp. 1998, 2001

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Contents ERserver Page ERserver Page Contents Troubleshooting communications problems Part 1. Getting started with AS/400 communications Version Print this topic Version Creating a network interface description Configuring AS/400 for communicationsCreating a network server description Creating a line descriptionVersion Adjusting the WAN line speed for optimum AS/400 performance Adjusting WAN protocols for optimum AS/400 performanceOptimizing communications performance Improving wide area network performanceWAN line speed considerations for IOPs Adjusting LANs for optimum communications performance Adjusting LAN lines for optimum communications performanceImproving local area network performance Improving data path performance LAN line speed considerations for IOPsAddcmne SBSDlibname/sbsname DEVdevname* MODEmodename Set up the communication entries Example Communications subsystem configurationExample Interactive subsystem configuration Communications performance considerations for batch jobsMixing interactive and batch jobs on a WAN line Setting up the AnyNet environment Performance considerations for AnyNet communicationsAnyNet communications for the AS/400 system Qusrwrk SubsystemsVersion Communications applications User written Appc applicationsDistributed data management DDM Version Communications applications Version Matching AS/400 parameters for a host system Communicating with host systemsSSAP/DSAP/remote-adapter-address Name Rmtcpname Vtamlst Sscpname Maxframe Group MaxdataRmtnetid Vtamlst Netid Ssap SapaddrLcllocname Dfhtct Netname Mode Modeent LogmodeLocadr Locaddr Locpwd Dfhtct BindpwdAS/400 Host Definition AS/400 Prompt Examples Connecting AS/400 to a host systemModd Modeent Logmode Cosd Modeent COSCommunicating with host systems Version Communicating with host systems Version Configuring dependent LU requester Dlur Configuring the host controller descriptionConfiguring the device descriptions Version AS/400 Remote AS/400 AS/400 Prompt Communicating with a remote AS/400 systemAdptadr AdrinsertAS/400 Remote AS/400 AS/400 Prompt Parameter Cnnnbr Netadr X25DCECnnpwd Dsap SsapLinkpcl InlcnnRmtcpname Lclcpname Rmtnetid LclnetidConnecting one AS/400 to another AS/400 system Version Communicating with a remote AS/400 system Version Matching AS/400 parameters for 5494 controllers Communicating with remote workstation controllersLAN AS/400 5494 Prompt AS/400 Parameter Field Subfield ValueRmtcpname RmtnetidLinktype LAN AS/400 5494 Prompt AS/400 Parameter Field SubfieldMatching AS/400 parameters for a 5494 connected by Ethernet AS/400 5494 Prompt Parameter Field Subfield Value Version LAN Adptadr Matching AS/400 parameters for a 5494 connected by Sdlc Prompt Parameter Field Subfield AS/400 Value AS/400Field Subfield AS/400 Value Communicating with remote workstation controllers Matching AS/400 parameters for a 5494 connected by Linktype Example Connecting AS/400 to a 5494 controller connected byIBM 5494 Remote Control Unit Planning Guide, GA27-3936 Linkpcl Qllc DftpktsizeEllc NetlvlField Subfield Value AS/400 5494 PromptCommunicating with remote workstation controllers Matching AS/400 parameters for 3x74 controller 3174 AS/400 Configuration PromptMatching AS/400 parameters for a 3174 controller Questions3174 AS/400 Configuration Prompt Parameter Questions Matching AS/400 parameters for a 3274 controller Switched Short-Hold ModeNRZ or Nrzi Encoding Control Unit AddressExample Connecting an AS/400 to a 3174 control unit 3274 AS/400Prompt Parameter Number Matching AS/400 parameters for 470x finance controllers Matching AS/400 parameters for finance controllersAS/400 AS/400 Prompt Parameter Macro Matching AS/400 parameters for Fbss finance controllers AS/400 AS/400 PromptMacro Parameter Service access point for PC Switched lineLine mode PC addressIdentification block and Identification number Service access point for Host/37xx/4700Matches the Fbss Identification number Data Link ControlMatching AS/400 parameters for retail controllers Example Connecting AS/400 to a finance networkAS/400 Definition AS/400 Prompt Parameter Statement Matching AS/400 parameters for 3651 retail controllersAS/400 Parameter Sdlclin Bit Bit Value AS/400 Definition AS/400 Prompt3684 AS/400 Definition Prompt Matching AS/400 parameters for 3684 retail controllers3684 AS/400 Definition Prompt Parameter AS/400 Parameter Linecon Bit Bit Value Matching AS/400 parameters for 4680/4690 Line parameterCNN*MP SNBU*NO SNBU*YES MODEMRATE*FULLMatching AS/400 parameters for 4680/4690 Link parameter Exchid parameter specified on the AS/400 Crtctlrtl commandAS/400 Prompt AS/400 Parameter Line Parameter CNNMatching AS/400 parameters for 4684 retail controllers Wire constant RTS?Local node Hex Remote node HexExamples Connecting AS/400 to a 4690 retail controller Version Communicating with remote workstation controllers Version Displaying message queues to solve communication problems Troubleshooting communications problemsQsysarb Job logs and communication problemsQpasvrp Solving communication problems using communications traceTrace option setting System service tools and communication problemsTrace full Solving communication problems using the system problem logConsiderations for system tuning during error recovery Solving communication problems using status informationUsing error messages to aid in error recovery Solving communication problems using reason codesReason Code Reason Description Reason Codes for Rejected Program Start RequestsReason Code Reason Description Advanced Peer-to-Peer Networking Networking conceptsDependent LU requester support Advanced program-to-program communicationsHigh-performance routing HPR architecture option setsInternetwork packet exchange support What is TCP/IP What is Systems Network ArchitectureLocal area network standards Common networking standardsATM on AS/400 Distributed data interface networkToken-ring networks Wireless networkAsynchronous communications Wide area network standardsBinary synchronous communications Frame relay networksIntegrated services digital network Synchronous data link control networkIsdn data link control network Network Version
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AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.