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IBM networking is a topic vast enough to justify the writing of many, many volumes Here we have only one section in a chapter to give an overview of the most common things a network administrator will have to do when integrating IBM applications over a TCP/IP-based Cisco router network Typically, Cisco routers are implemented to reduce or totally eliminate the need for IBM front-end processors (FEPs) FEPs direct SNA traffic over a network, typically using low-speed 9600 bps lines The drive to reduce FEP utilization comes from an economic need to reduce the cost of FEP support and to provide a cost-effective WAN that can deliver client/server IP-based, as well as SNA, applications Typically Cisco routers get introduced in an IBM data center via direct channel attachment to replace a FEP and in each remote branch location connected to the data center The data center router will route IP traffic over the WAN as normal and use a technology called Data Link Switching to transport SNA or NetBIOS traffic over the same WAN At the remote branch end of the network, a small 2500-series router can be used both to connect LAN workstations to the WAN that can receive IP traffic, and to connect an IBM terminal controller that receives SNA traffic to service local IBM 3270 terminals
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Overview of IBM Technology
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Let's face it, all this TCP/IP internetworking stuff may be fun, but what really delivers the benefits of computer technology to an organization is a well-designed, reliable, and responsive application IBM technology has been the technology of choice for mission-critical applications for the past 20 years and will be with us for many more The basic reason for this is that it works With IBM's NetView management system, network managers also have an effective tool to monitor, troubleshoot, and (important for mission-critical applications), guarantee response times of applications IBM technology is hierarchical and fits well into an organization that works in a structured fashion, as everything is controlled by a central MIS department Clearly, in today's faster-moving business environment, such central control with its inherent backlogs is not the favored approach for many organizations when planning future information systems development Having said that, if an existing application is in place and serving its users well, there is little need to replace it just to make a network manager's life easier Given that IBM applications will be around for a while, it is more cost-effective to integrate them into a multiprotocol network than to provide a separate network just for that traffic Let's now look at IBM's communication technology in a little more detail IBM Networking Systems The most prevalent IBM networking system is the Systems Network Architecture (SNA) SNA is a centralized hierarchical networking model that assigns specific roles to machines within the overall network IBM mainframe operating systems (such as MVS, VM, or VSE) were designed to have access to an SNA network via VTAM, the Virtual Telecommunications Access Method, which defines which computers will connect to which applications Applications in this environment are written to interface to VTAM through Logical Unit (LU) sessions LU sessions are established, terminated, and controlled via a VTAM function called the System Services Control Point (SSCP) For IBM network staff, the terms LU and PU (Physical Unit) are frequently referenced terms Defining an LU of 2 identifies a 3270 terminal session, for example In addition, each type of terminating device (such as a printer or workstation) will have a different PU number associated with it
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IBM networkers are accustomed to having a method by which to allocate specific bandwidth resources to different types of traffic This is not available as standard within TCP/IP, which relies on vendor-specific features such as Cisco's priority or custom queuing to duplicate that functionality Being a centralized hierarchy, SNA provides good security with the RACF system, which is not matched very well by any security system currently implemented in the TCP/IP world Again, TCP/IP standards rely on vendor-specific implementations such as Cisco access lists and TACACS+ (all of these extensions will be covered in subsequent sections) A totally different IBM architecture is the Advanced Peer-to-Peer Networking scheme (APPN), which was designed for the AS/400 environment In this architecture, the Logical Unit used is LU62, which applications use via a program interface called Advanced Program-to-Program Communication (APPC) Instead of 3270 sessions, the AS/400 operating system uses 5250 sessions to communicate between the server and workstation A large part of why IBM systems lost popularity was due to these different architectures associated with different hardware platforms In many organizations, network staff had to implement multiple cabling systems and users needed multiple terminals on their desks to access different IBM systems TCP/IP Support Provided by IBM IBM mainframe and midrange computers will support TCP/IP connectivity directly via the TN3270 and TN5250 protocols These protocols allow a user workstation running only TCP/IP communications software to run 3270 and 5250 applications over a TCP/IP network Most of the functionality required by a user to run IBM applications is provided by the TN3270 and TN5250 protocols; however, some features are missing that might be important to some users In TN3270, the print job confirmation feature, important to users such as stockbrokers looking for trade confirmations, is not supported by the TCP/IP LPR/LPD printing mechanism Also, the SysReq and Attn keys used to swap between mainframe applications is not fully supported under TCP/IP In TN5250, most terminal emulation, printing, and file-sharing functions are available, but file transfer has been a problem APPN allows sophisticated querying of DB2 databases to retrieve data With TN5250, there are no APPN functions, so it is much more difficult to retrieve query output from a DB2 database IBM has resolved these problems with a technology called Multiprotocol Transport Networking (MPTN) Using this technology, an APPC application can communicate over a TCP/IP network without the need for client workstations to load multiple protocol stacks IBM achieves this by use of an application call translator that maps APPN to TCP/IP sockets function calls With an introduction to the IBM technology and an idea of some of the problems, let's look at how Cisco deals with them
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