IBM BC-201 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 245

•TCP/IP Offload, page 245

•IP Host Backup, page 246

•Cisco Multipath Channel+, page 246

•TN3270 Server, page 248

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 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

The Cisco 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

 

 

 

 

 

 

 

78-11737-02

 

 

BC-245

 

 

 

 

 

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Contents BC-201 Overview of IBM NetworkingBC-202 RsrbBC-203 Configuration ConsiderationsBC-204 DLSw+DLSw Standard DLSw Version 2 StandardBC-205 Enhanced Peer-on-Demand Routing Feature DLSw+ FeaturesIP Multicast UDP UnicastBC-207 Local AcknowledgmentLLC2 Session Without Local Acknowledgment BC-208BC-209 BC-210 DLSw+ Support for Other SNA FeaturesStun and Bstun Stun NetworksBC-211 BC-212 Stun FeaturesBC-213 Stun BC-214LLC2 and Sdlc Parameters Bstun FeaturesBstun Networks BC-215BC-216 Cisco Implementation of LLC2IBM Network Media Translation Cisco Implementation of SdlcBC-217 Sdllc Media Translation Features Virtual Token Ring ConceptBC-218 Maintaining a Dynamic RIF Cache Resolving Differences in LLC2 and Sdlc Frame SizeOther Considerations BC-219BC-220 Qllc ConversionBC-221 Cisco Implementation of Qllc ConversionBC-222 Comparing Qllc Conversion to SdllcBC-223 Other Implementation ConsiderationsBC-224 RFC 1490 Routed Format for LLC2 BNNBC-225 RFC 1490 Bridged Format for LLC2 BANBC-226 Ncia ServerBC-227 Ncia Client/Server ModelAdvantages of the Client/Server Model Extended ScalabilityBC-228 BC-229 Migration SupportBC-230 Dspu and SNA Service PointBC-231 Shows a router functioning as a Dspu concentratorSNA Switching Services Benefits of SNASwBC-232 Scalable Appn Networks Reduced Configuration RequirementsIP Infrastructure Support Network Design SimplicityHPR Capable SNA Routing Services Branch ExtenderBC-234 BC-235 Enterprise Extender HPR/IPResponsive Mode Adaptive Rate-Based Flow Control Usability FeaturesDynamic CP Name Generation Support Dynamic SNA BTU SizeManagement Enhancements Interprocess Signal TracingUser-Settable Port Limits Console Message ArchivingMIB Support for Advanced Network Management Awareness LAN and IP-Focused Connection TypesToken Ring, Ethernet, and Fddi Virtual Token RingCisco Transaction Connection Virtual Data-Link ControlNative IP Data-Link Control HPR/IP BC-240 Ctrc and CicsBC-241 Ctrc and DB2Cmcc Adapter Hardware Benefits of CtrcBC-242 Channel Interface Processor Channel Port AdapterBC-243 Escon Channel Port Adapter Differences Between the CIP and CPAParallel Channel Port Adapter BC-244Common Link Access to Workstation Cmcc Adapter Features for TCP/IP EnvironmentsSupported Environments TCP/IP OffloadIP Host Backup Cisco Multipath Channel+BC-246 Cmcc Adapter Features for SNA Environments Cisco SNABC-247 Cisco Multipath Channel TN3270 ServerBC-248 SNA Functions Telnet Server FunctionsBC-249 BC-250
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