IBM BC-203 Cmcc Adapter Features for TCP/IP Environments, Supported Environments, TCP/IP Offload

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Overview of IBM Networking

CMCC Adapter Features for TCP/IP Environments

Supported Environments

The Cisco IOS software supports the following environments and features on the CMCC adapters:

•TCP/IP Environments—CLAW, TCP/IP offload, IP host backup, CMPC+, and TN3270 server features

•SNA and APPN Environments—CSNA, CMPC, and TN3270 server features

CMCC Adapter Features for TCP/IP Environments

The Cisco IOS software supports the following features for CMCC adapters in TCP/IP environments:

•Common Link Access to Workstation, page 248

•TCP/IP Offload, page 248

•IP Host Backup, page 249

•Cisco Multipath Channel+, page 249

•TN3270 Server, page 251

Common Link Access to Workstation

To transport data between the mainframe and a CMCC adapter in TCP/IP environments, Cisco IOS software implements the CLAW channel protocol. Each CLAW connection requires two devices out of a maximum of 256. Although this allows for a maximum of 128 CLAW connections per interface, a maximum of 32 CLAW connections per interface is recommended.

The CLAW packing feature enables the transport of multiple IP packets in a single channel operation and significantly increases throughput performance between a mainframe and a CMCC adapter. Currently, IBM’s TCP/IP stack does not support the CLAW packing feature.

The CLAW packing feature requires changes to the mainframe CLAW driver support. In partnership with Cisco, Interlink Computer Science (now Sterling Software) has made the corresponding CLAW driver change to Cisco IOS for S/390 Release 2 and Interlink TCPaccess 5.2. Customers must make the necessary changes to their host configurations in order to enable the CLAW packing feature.

For details about configuring a CMCC adapter for CLAW, see the “Configuring CLAW and TCP/IP Offload Support” chapter in this publication.

TCP/IP Offload

Cisco’s TCP/IP offload feature supports IBM’s MVS, VM, and Transaction Processing Facility (TPF) operating systems. The TCP/IP offload feature for CMCC adapters delivers the same function as the TCP/IP offload function on the 3172 Interconnect Controller (Model 3), but with increased performance.

For details about configuring a CMCC adapter for TCP/IP offload, see the “Configuring CLAW and TCP/IP Offload Support” chapter in this publication.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-248

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Contents Overview of IBM Networking BC-203Rsrb BC-204Configuration Considerations BC-205DLSw+ BC-206DLSw Version 2 Standard DLSw StandardBC-207 IP Multicast DLSw+ FeaturesEnhanced Peer-on-Demand Routing Feature UDP UnicastLocal Acknowledgment BC-209BC-210 LLC2 Session Without Local AcknowledgmentBC-211 DLSw+ Support for Other SNA Features BC-212Stun Networks Stun and BstunBC-213 Stun Features BC-214BC-215 BC-216 StunBstun Networks Bstun FeaturesLLC2 and Sdlc Parameters BC-217Cisco’s Implementation of LLC2 BC-218Cisco’s Implementation of Sdlc IBM Network Media TranslationBC-219 Virtual Token Ring Concept Sdllc Media Translation FeaturesBC-220 Other Considerations Resolving Differences in LLC2 and Sdlc Frame SizeMaintaining a Dynamic RIF Cache BC-221Qllc Conversion BC-222Cisco’s Implementation of Qllc Conversion BC-223Comparing Qllc Conversion to Sdllc BC-224Other Implementation Considerations BC-225RFC 1490 Routed Format for LLC2 BNN BC-226RFC 1490 Bridged Format for LLC2 BAN BC-227BC-228 NciaNcia Client/Server Model Ncia ServerBC-229 BC-230 Ncia Server Client/Server ModelMigration Support Advantages of the Client/Server ModelExtended Scalability BC-231BC-232 AlpsDspu and SNA Service Point BC-233BC-234 Router Acting as a Dspu ConcentratorBenefits of SNASw SNA Switching ServicesBC-235 IP Infrastructure Support Reduced Configuration RequirementsScalable Appn Networks Network Design SimplicityBranch Extender HPR Capable SNA Routing ServicesBC-237 Enterprise Extender HPR/IP BC-238Dynamic SNA BTU Size Usability FeaturesDynamic CP Name Generation Support Dlur Connect-OutManagement Enhancements Token Ring, Ethernet, and Fddi LAN and IP-Focused Connection TypesTrap MIB Support for Advanced Network Management Awareness Virtual Token RingVirtual Data-Link Control DLC Switching Support for Access to Sdlc and QllcCisco Transaction Connection Native IP Data-Link Control HPR/IPCtrc and Cics BC-243Ctrc and DB2 BC-244Benefits of Ctrc Cmcc Adapter HardwareBC-245 Channel Port Adapter Channel Interface ProcessorBC-246 Parallel Channel Port Adapter Differences between the CIP and CPAEscon Channel Port Adapter BC-247Supported Environments Cmcc Adapter Features for TCP/IP EnvironmentsCommon Link Access to Workstation TCP/IP OffloadCisco Multipath Channel+ IP Host BackupBC-249 Cisco SNA Cmcc Adapter Features for SNA EnvironmentsBC-250 TN3270 Server Cisco Multipath ChannelBC-251 Telnet Server Functions SNA FunctionsBC-252 BC-253 BC-254
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