Cisco Systems S/390 TCP Mindev and RTO Defaults Changed, Append Keyword for Lupool Statement

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Documentation

TCP MINDEV and RTO Defaults Changed

Two of the defaults in the TCPCFG00 file have changed.

For the TCP statement, the MINDEV parameter defaults to 40 (0.10 second).

Also on the TCP statement, the RTO parameter defaults to 0; range 0 - 6000.

APPEND Keyword for LUPOOL Statement

In configuration member APPLUP00, a new keyword, APPEND has been added to the LUPOOL statement.

LUPOOL NAME(pool_name)

APPEND(lu_name,...,lu_name)

Syntax Description

APPEND

Specifies additional LU names for an LUPOOL. When APPEND is specified with

 

a previously defined NAME, the LU names specified are appended to that

 

previously defined for LUPOOL. There is no limit to the number of LUPOOL

 

statements that can be specified with the APPEND keyword. Duplicate LU name

 

checking is done for the complete list of LU names (original and appended).

Example:

 

LUPOOL

NAME(VLTPOOL0)

LU(T20000,T20001,T20002,T20003,T20004,T20005,T20006,T20007,T20008)

LUPOOL NAME(VLTPOOL0) APPEND

LU(T20010,>T20011,T20012,T20013,T20014,T20015,T20016,T20017,T20018)

CDLC Considerations

The 3746-900 unit is configured with a network MTU size, but will override it with the lowest MTU size it encounters. That MTU size will be applied to whatever mainframe software will be running next. Therefore, if a small MTU size is used, that will become the restriction for subsequent IP packet sizes and may cause problems if fragmentation is not allowed. The CDLC MTU size should correspond to its network configuration parameter.

Recommendations on Setting TOS

The following recommendations for setting TOS (type of service) have been added to the Cisco IOS for S/390 Customization Guide.

When setting TOS, precedence bits should be set to zero.Of the next 4 bits, only one is to be set on in any one packet: 16 = mindelay, 8 = max thruput, 4 = reliability, 2 = min cost. These should be set as follows:

Telnet = 16

FTP Control = 16, Data = 8,

SMTP Commands = 16, Data = 8

DNS query = 16, zone transfer = 8

SNMP = 4

NNTP = 2

16Cisco IOS for S/390 Release 2.0 Release Notes

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Contents Cisco IOS for S/390 Release 2.0 Release Notes Enhanced Features Enhanced FeaturesImproved Performance and Efficiency Improved ManagementProduct Changes Enhanced APIsOther Enhancements Enhanced APIsProduct Changes Parameter Aliases APPCFG00 DNRCFG00 IJTCFG00 SNMCFG00 TCPCFG00Acpcfg Member Changes Arcb Cbuf Epcb SRE Tpcb Tsqb Tucb Product ChangesProduct Changes New Features New FeaturesDocumentation Cisco Connection OnlineCisco Connection Online Product Documentation Library Product Documentation LibraryService Startup Statement Changes to the Documentation SetCisco IOS for S/390 Users Guide Cisco IOS for S/390 Planning GuideExit Work Area Exit Recovery Routine Recovery ExitRecovery Exit Register Contents Register Contents on EntryCisco IOS for S/390 System Management Guide Customizing CA-ACF2 Version 6 or LaterRefreshing Usstab Syntax DescriptionParameters for the Svcdump Command Protocol Layer Events Subtypes 110 123 DescriptionsMU1IUCV Usermod Correction Subtype DescriptionNetstat RTM Command Cisco IOS for S/390 Customization GuideCapture of User Data in a TLI Trace Tcpeep Netif OptionTCP Mindev and RTO Defaults Changed Recommendations on Setting TOSAppend Keyword for Lupool Statement AppendLogging Keywords Logically Grouped Class Dest Form WriterLines Minutes Sync Logging ExamplesCisco IOS for S/390 Prefixed Messages T01CF080RT01CF081W T01CF082WCisco IOS for S/390 Unprefixed Messages and Codes Documentation ’C245’ Instance Codes Byte code Description C24Cxxxx 0Exx T012TOPT’C24C’ Instance Codes C25Bxxxx 1Dxx T012TERR ’C25B’ Instance CodesC25Fxxxx 21xx T01PSTUB C262xxxx 6Fxx T012TPLKDocumentation Byte code Description XC25F Instance CodesInstalling Cisco IOS for S/390 Release Installation RequirementsCallable System Services Library TSO/EACF/2 SAS/C Release LevelCommon Inet Sockets in OpenEdition RS6000Vtam Release MVS/ESA Release 5.1 ConsiderationsControl File JCL Installation ProcessHardware/Software/Microcode Compatibility Installation Process Allocate the Data Set Names for Cisco IOS for S/390 releaseTcpnames JobcardALLOCT00 InstsmpeHolddata SmpecumtGuest bin Cd /pub/ptf520 CustomizationParm Customization Modify Trace on SIZE256Usermod Customization Invoking Cisco IOS for S/390 ReleaseDiagnosis and Problem Reporting Diagnosis and Problem ReportingObtaining GTF Output Obtaining a Snap DumpSAS/C Usage Notes Obtaining a TcpeepObtaining an SVC Dump Obtaining JCL OutputACPCFG00 Host Statement Logstamp Loopbuf MVS Sysdump LoopmtuHost SSN Global API Security Security CLASS, PROFILE, APPLNAME, Xsec LoggingGreetingyesnoappl Logstamp NologstampLUPARMACPLUP00 LUPARMAPPLUP00Service Telnet Appl Termprof FTP GAT Smtp LPR Vtam Service Telnet ApplApplication Statement Mappings TCP Protocol ParametersKEEPALIVETIMERnum TIB ProtocoltcpTADDRUSEranges KeepalivegarbagenogarbageUDP Protocol Parameters RAW Protocol ParametersTIB Protocoludp UDPNetwork Parameters TIB ProtocolrawArptable Lnid Loop Network Medianame Network MetricRoute Parameters Mssoptneversubnet NetalwaysChecksumhostyes OffloadnoDriver Configuration LocalArptable ARP FlagsgnacrcsrcErrorabend Optionsasyncsync Dsmesm Getmainpcore Loopnoloop DocpeocpTracenotrace LniclawLniclaw DEVADDRccuu DEVADDRccuuSinglenoopdoublenoop BUFSIZE1024204330724096Driver Configuration LnihyprTrace Name Lnihypr HyprBcasttrunc Errorabend ArptableserverLnilcs and Lnilink Medianame Autostart PfilterIJTCFG00 Changes Ifsparm Promptnoprompt Logging StatementAuth Logging Statement Cisco IOS for S/390 Release 2.0 Release Notes

S/390 specifications

Cisco Systems S/390, also known as IBM's S/390 architecture, is a revolutionary mainframe computing solution that has significantly impacted enterprise computing since its introduction. Though primarily associated with IBM, its integration with Cisco Systems technologies has fostered enhanced networking capabilities, creating a robust platform for organizations to leverage.

One of the most notable features of the S/390 architecture is its scalability. The system is designed to manage workloads efficiently, enabling organizations to scale their operations seamlessly as their requirements grow. This architecture supports an extensive range of applications, from transaction processing to complex data analysis, making it suitable for diverse industries.

The S/390 systems are known for their reliability and resilience. With advanced error detection and correction mechanisms, the architecture minimizes downtime, ensuring that mission-critical applications remain operational. The mainframe's design accommodates redundancy and fault tolerance, reinforcing its reputation as a dependable computing solution.

Moreover, security is a core characteristic of the S/390 infrastructure. It incorporates various security features, such as encryption and robust access control mechanisms, to safeguard sensitive data against unauthorized access and cyber threats. This level of security is particularly critical for industries such as finance, healthcare, and government, where data protection is paramount.

The integration of Cisco networking technologies with the S/390 architecture brings enhanced connectivity and streamlined communication capabilities. Cisco’s advanced routing, switching, and security solutions bolster the mainframe's communication prowess, enabling organizations to create seamless, high-performance networks. This ensures that data flows efficiently between the mainframe and other networked devices.

Additionally, S/390 supports an array of middleware solutions, facilitating better interoperability with modern applications and cloud services. Organizations can take advantage of this flexibility to leverage existing investments in technology while embracing innovative solutions.

In summary, Cisco Systems S/390 embodies a potent combination of scalability, reliability, security, and advanced networking features. Its architecture serves as a cornerstone for enterprise computing, allowing organizations to meet their evolving business needs while maintaining high-performance standards. As businesses increasingly rely on data-driven decision-making, S/390 remains a critical asset for organizations striving for efficiency and innovation in their operations.