IBM BC-203 manual HPR Capable SNA Routing Services, Branch Extender, BC-237

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Overview of IBM Networking

HPR Capable SNA Routing Services

HPR Capable SNA Routing Services

SNASw provides the following SNA routing functions:

•Routes SNA sessions between clients and target SNA data hosts.

•Supports full SNA class of service (COS) features.

•Controls SNA traffic in a multiprotocol environment in conjunction with other Cisco IOS quality of service (QOS) features.

•Supports networks with a high proportion of SNA traffic and multiple enterprise servers, especially those that continue to support the traditional SNA endstation platform and new client types.

•Supports all types of SNA application traffic including traditional 3270 and peer LU 6.2.

•Supports an OS/390 Parallel Sysplex configuration, working in conjunction with the IBM Communications Server for S/390 (formerly VTAM) and the MVS Workload Manager, to provide higher availability in the data center using the High Performance Routing (HPR) feature.

•Supports System Services Control Point (SSCP) services to downstream SNA devices using the Dependent LU Requester (DLUR) feature.

•Provides dynamic link connectivity using connection networks (CNs), which eliminates much of the configuration required in networks with numerous data hosts.

Branch Extender

The BEX function enhances scalability and reliability of SNA routing nodes by eliminating topology updates and broadcast directory storms that can cause network instability. BEX appears as an NN to downstream EN, LEN node, and PU devices, while also appearing as an EN to upstream devices. The BEX function eliminates APPN topology and APPN broadcast search flows between SNASw nodes and the SNA data hosts in the network. This feature is key to providing a reliable turn-key installation because the network administrator no longer needs to develop in-depth knowledge of the level and characteristics of broadcast directory search and topology update traffic in the network. Such knowledge and analysis was commonly required to build successful networks utilizing NN technology without BEX.

SNA Switching Services enables BE functionality by default. SNASw treats all defined links as BE “uplinks” and all dynamic links created by stations connecting into SNASw as BE “downlinks.” No specific configuration is necessary to enable BE functionality.

Figure 107 illustrates the BX functionality.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-237

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Contents BC-203 Overview of IBM NetworkingBC-204 RsrbBC-205 Configuration ConsiderationsBC-206 DLSw+BC-207 DLSw StandardDLSw Version 2 Standard UDP Unicast DLSw+ FeaturesEnhanced Peer-on-Demand Routing Feature IP MulticastBC-209 Local AcknowledgmentLLC2 Session Without Local Acknowledgment BC-210BC-211 BC-212 DLSw+ Support for Other SNA FeaturesBC-213 Stun and BstunStun Networks BC-214 Stun FeaturesBC-215 Stun BC-216BC-217 Bstun FeaturesLLC2 and Sdlc Parameters Bstun NetworksBC-218 Cisco’s Implementation of LLC2BC-219 IBM Network Media TranslationCisco’s Implementation of Sdlc BC-220 Sdllc Media Translation FeaturesVirtual Token Ring Concept BC-221 Resolving Differences in LLC2 and Sdlc Frame SizeMaintaining a Dynamic RIF Cache Other ConsiderationsBC-222 Qllc ConversionBC-223 Cisco’s Implementation of Qllc ConversionBC-224 Comparing Qllc Conversion to SdllcBC-225 Other Implementation ConsiderationsBC-226 RFC 1490 Routed Format for LLC2 BNNBC-227 RFC 1490 Bridged Format for LLC2 BANNcia BC-228BC-229 Ncia ServerNcia Client/Server Model Ncia Server Client/Server Model BC-230BC-231 Advantages of the Client/Server ModelExtended Scalability Migration SupportAlps BC-232BC-233 Dspu and SNA Service PointRouter Acting as a Dspu Concentrator BC-234BC-235 SNA Switching ServicesBenefits of SNASw Network Design Simplicity Reduced Configuration RequirementsScalable Appn Networks IP Infrastructure SupportBC-237 HPR Capable SNA Routing ServicesBranch Extender BC-238 Enterprise Extender HPR/IPDlur Connect-Out Usability FeaturesDynamic CP Name Generation Support Dynamic SNA BTU SizeManagement Enhancements Virtual Token Ring LAN and IP-Focused Connection TypesTrap MIB Support for Advanced Network Management Awareness Token Ring, Ethernet, and FddiNative IP Data-Link Control HPR/IP DLC Switching Support for Access to Sdlc and QllcCisco Transaction Connection Virtual Data-Link ControlBC-243 Ctrc and CicsBC-244 Ctrc and DB2BC-245 Cmcc Adapter HardwareBenefits of Ctrc BC-246 Channel Interface ProcessorChannel Port Adapter BC-247 Differences between the CIP and CPAEscon Channel Port Adapter Parallel Channel Port AdapterTCP/IP Offload Cmcc Adapter Features for TCP/IP EnvironmentsCommon Link Access to Workstation Supported EnvironmentsBC-249 IP Host BackupCisco Multipath Channel+ BC-250 Cmcc Adapter Features for SNA EnvironmentsCisco SNA BC-251 Cisco Multipath ChannelTN3270 Server BC-252 SNA FunctionsTelnet Server Functions BC-253 BC-254
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