Change Ctl Desc (APPC) (CHGCTLAPPC)

The Change Controller Description (APPC) (CHGCTLAPPC) command changes a controller description for an advanced program-to-program communications (APPC) controller.

If the controller was created with LINKTYPE(*LOCAL), the following restrictions apply:

• No communications line can be specified.
• MAXFRAME, RMTNETID, RMTCPNAME, SSCPID, CPSSN, NODETYPE, and TMSGRPNBR must not be specified.
• Parameters relating to SDLC, X.21 short-hold mode, X.25, or LAN configuration must not be specified.

More information is in the Communications Configuration book, SC41-5401 book.

Restriction: You must have input/output system configuration (*IOSYSCFG) special authority to use this command.

Parameters

Controller description (CTLD)

This is a required parameter.

Specifies the name of the controller description.

Online at IPL (ONLINE)

Specifies whether this object is automatically varied on at initial program load (IPL).

*SAME

This value does not change.

*YES

The controller is automatically varied on at IPL.

*NO

The controller is not automatically varied on at IPL.

Activate swt network backup (ACTSNBU)

Specifies, for modems that support the switched network backup (SNBU) feature and that are not IBM 386x, 586x, or 786x models, whether the SNBU feature is activated or deactivated. The local modem and remote modem must both support the SNBU to activate it. IBM 386x, 586x, and 786x models are activated with a hardware switch only. This feature lets you bypass a broken nonswitched connection (nonswitched line) by establishing a switched connection.

*SAME

This value does not change.

*NO

The SNBU feature is not used.

*YES

The SNBU feature is activated. You must also specify a value of *YES for the Activate swt network backup (ACTSNBU) parameter for the line.

APPN-capable (APPN)

Specifies whether the local system uses advanced peer-to-peer networking (APPN) functions when communicating with this controller. *YES must be specified for APPC controllers attached to a TDLC line.

*SAME

This value does not change.

*YES

This controller is for APPN.

*NO

This controller is not for APPN.

Remote internet address (RMTINTNETA)

Specifies the TCP/IP host name or internet address to which the controller will respond.

Note: This parameter is valid only when *HPRIP is specified for the Link type (LINKTYPE) parameter.

*SAME

This value does not change.

host-name

This is a valid host name or a domain qualified host name associated with an internet address. A name must be between 1 and 255 characters in length.

host-internet-address

The internet address can be specified in either IPv4, IPv6 or IPv4 mapped to IPv6 form.

An IPv4 internet address is specified in the form, nnn.nnn.nnn.nnn, where nnn is a decimal number ranging from 0 through 255. Leading zeros in each part of the dotted decimal internet address are invalid and will be removed. An IPv4 internet address is not valid if it has a value of all binary ones or zeros for the network identifier (ID) or host portion of the address.

An IPv6 internet address is specified in the form x:x:x:x:x:x:x:x, where x is a hexadecimal number ranging from 0 through X'FFFF'. "::" may be used once in the IPv6 address to indicate one or more groups of 16 bits of zeros. The "::" may be used to compress leading, imbedded, or trailing zeros in the address.

An IPv4-mapped IPv6 address is specified in the form ::FFFF:nnn.nnn.nnn.nnn, where nnn is decimal number ranging from 0 through 255.

If the internet address is entered from the command line, the address must be enclosed in apostrophes.

Local internet address (LCLINTNETA)

Specifies the TCP/IP interface to be used to communicate with the remote system.

Note: This parameter is valid only when *HPRIP is specified for the Link type (LINKTYPE) parameter.

*SAME

This value does not change.

*SYS

The system will select the local internet address to use.

internet-address

The internet address can be specified in either IPv4, IPv6 or IPv4 mapped to IPv6 form.

An IPv4 internet address is specified in the form, nnn.nnn.nnn.nnn, where nnn is a decimal number ranging from 0 through 255. Leading zeros in each part of the dotted decimal internet address are invalid and will be removed. An IPv4 internet address is not valid if it has a value of all binary ones or zeros for the network identifier (ID) or host portion of the address.

An IPv6 internet address is specified in the form x:x:x:x:x:x:x:x, where x is a hexadecimal number ranging from 0 through X'FFFF'. "::" may be used once in the IPv6 address to indicate one or more groups of 16 bits of zeros. The "::" may be used to compress leading, imbedded, or trailing zeros in the address.

An IPv4-mapped IPv6 address is specified in the form ::FFFF:nnn.nnn.nnn.nnn, where nnn is decimal number ranging from 0 through 255.

If the internet address is entered from the command line, the address must be enclosed in apostrophes.

Alias-name

The alias name is the same value that is specified on the ADDTCPIFC and CHGTCPIFC commands Alias name (ALIASNAME) parameter.

LDLC timers (LDLCTMR)

Specifies LDLC (Logical Data Link Control) timers and retry count. The LDLC retry count and LDLC retry timer are used in conjunction. The LDLC retry count and LDLC retry timer are initialized when a command or request is first transmitted over the link. If the LDLC retry timer expires before a response is received, the command or request is retransmitted, the LDLC retry count is decremented and the LDLC retry timer is restarted. If the timer expires with the LDLC retry count at zero, the link is assumed to be inoperative. The LDLC liveness timer is used to make sure that both the other endpoint of an RTP (rapid transport protocol) connection and the path between the endpoints are still operational after a period of inactivity.

See High Performance Routing Architecture Reference (SV40-1018) for more information.

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/D50H6003/CCONTENTS

Note: This parameter is valid only when *HPRIP is specified for the Link type (LINKTYPE) parameter.

Element 1: LDLC retry count

*SAME

This value does not change.

retry-count

Specify the LDLC retry counter. Valid values range from 0 to 255.

Element 2: LDLC retry timer

*SAME

This value does not change.

retry-timer

Specify the LDLC retry timer interval. Valid values range from 0 to 65535 seconds.

Element 3: LDLC liveness timer

*SAME

This value does not change.

liveness-timer

Specify the LDLC liveness timer. Valid values range from 0 to 65535 seconds.

LDLC link speed (LDLCLNKSPD)

Specifies the LDLC (Logical Data Link Control) link speed in bits per second.

See High Performance Routing Architecture Reference (SV40-1018) for more information.

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/D50H6003/CCONTENTS

Note: This parameter is valid only when *HPRIP is specified for the Link type (LINKTYPE) parameter.

*SAME

This value does not change.

*CAMPUS

Specifies a set of default APPN link characteristics for a campus environment be used.

*WAN

Specifies a set of default APPN link characteristics for a wide-area network environment be used.

4M

The link speed is 4 million bits per second.

10M

The link speed is 10 million bits per second.

16M

The link speed is 16 million bits per second.

100M

The link speed is 100 million bits per second.

*MIN

A link speed of less than 1200 bits per second is used.

*MAX

A link speed greater than 100 million bits per second is used.

LDLC-link-speed

Specify the LDLC link speed. Specify a value from 1200 to 603979776000 bits per second.

LDLC transmission group (LDLCTMSGRP)

Specifies the LDLC (Logical Data Link Control) transmission group characteristics of Cost/connect time, Cost/byte, Security and Propagation delay.

See High Performance Routing Architecture Reference (SV40-1018) for more information.

http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/D50H6003/CCONTENTS

Note: This parameter is valid only when *HPRIP is specified for the Link type (LINKTYPE) parameter.

Element 1: Cost/connect time

Cost per connect time specifies the relative cost of being connected over the link.

*SAME

This value does not change.

cost-connection-time

Specify the cost per connect time. Valid values range from 0 to 255.

Element 2: Cost/byte

Cost per byte specifies the relative cost of sending and receiving data over the link.

*SAME

This value does not change.

cost-byte

Specify the cost per byte. Valid values range from 0 to 255.

Element 3: Security

Security specifies the security over the link.

*SAME

This value does not change.

*NONSECURE

There is no security over the link.

*PKTSWTNET

This is a packet-switched network, so the link is secure in the sense that the data does not always use the same path through the network.

*UNDGRDCBL

This is an underground cable secure conduit.

*SECURECND

This is a secured conduit but not guarded.

*GUARDCND

The link is a guarded conduit and protected against physical tapping.

*ENCRYPTED

Data flow is to be encrypted.

*MAX

This is a guarded conduit, protected against physical and radiation tapping.

Element 4: Propagation delay

Propagation delay specifies the time required for a signal to travel from one end of a link to the other end.

*SAME

This value does not change.

*LAN

Specifies a local area network delay (less than 0.48 milliseconds).

*MIN

Specifies the minimum delay.

*TELEPHONE

Specifies a telephone network with a delay from .48 milliseconds through 49.152 milliseconds.

*PKTSWTNET

Specifies a packet-switched network with the delay from 49.152 through 245.76 milliseconds.

*SATELLITE

Specifies satellite delay (greater than 245.76 milliseconds).

*MAX

Specifies the maximum delay.

Switched line list (SWTLINLST)

Specifies the names of the switched lines to which this controller attaches. The line descriptions must already exist. Up to 64 switched line names can be specified.

*SAME

This value does not change.

switched-line-name

Specify the names of up to 64 lines that are connected to this controller. The same line name can be used more than once. For each line name specified, a line description by that name must already exist.

Character code (CODE)

Specifies whether the extended binary-coded decimal interchange code (*EBCDIC) or the American National Standard Code for Information Interchange (*ASCII) character code is used on the line.

*SAME

This value does not change.

*EBCDIC

The extended binary-coded decimal interchange code (EBCDIC) character code is used.

*ASCII

The ASCII character code is used.

Maximum frame size (MAXFRAME)

Specifies the maximum frame (path information unit (PIU)) size the controller can send or receive. This value is used to calculate the request unit (RU) sizes. Since the maximum PIU size that the controller can send or receive is negotiated at exchange identifier time, the maximum PIU size used at run time may be different. This value matches the corresponding value on the host system.

*SAME

This value does not change.

*LINKTYPE

The following values are used for the various types:

• *LAN - 16393
• *SDLC - 521
• *TDLC - 4105
• *IDLC - 2048
• *X25 - 1024
• *FR - 1590
• *HPRIP - 1461

maximum-frame-size

Specify the frame size for the controller. The frame size that can be used depends on the type of line being used. Valid frame sizes for each line type are:

• For *FR, specify a value from 265 through 8182.
• For *IDLC, specify a value ranging from 265 through 8196.
• For *LAN, specify a value from 265 through 16393 (265 through 4444 for DDI LANs).
• For *SDLC, specify 265, 521, 1033, or 2057.
• For *X25, specify 256, 265, 512, 521, 1024, 1033, 2048, or 4096.
• For *HPRIP, specify a value equal to or larger than 768.

Note: The numeric values listed for *LINKTYPE are valid only if TYPE(*BLANK) is specified when the controller is created.

Remote network identifier (RMTNETID)

Specifies the NAME of the remote network in which the adjacent control point resides.

*SAME

This value does not change.

*NETATR

The LCLNETID value specified in the system network attributes is used.

*NONE

No remote network identifier (ID) is used.

*ANY

Calls are accepted from any X.25 network address.

remote-network-identifier

Specify the remote network identifier.

Remote control point (RMTCPNAME)

Specifies the control point name of the remote system.

*SAME

This value does not change.

*NONE

Specifies no remote control point name is used.

*ANY

The system determines the name of the remote control point used.

remote-control-point-name

Specify the remote control point NAME.

Remote system name (RMTSYSNAME)

Specifies the NAME of the remote system to which there is an OptiConnect bus connection. The current system NAME of the remote system can be found by using the DSPNETA command on that system.

Note: This parameter is valid only when LINKTYPE(*OPC) is specified.

*SAME

This value does not change.

SSCP identifier (SSCPID)

Specifies the system service control point identifier of the host system.

*SAME

This value does not change.

*NONE

No system service control point identifier is specified.

system-service-control-point-identifier

Specify the system service control point identifier as a 12-digit hexadecimal value.

Initial connection (INLCNN)

Specifies the method used to establish a connection with this controller.

*SAME

This value does not change.

*DIAL

The system initiates outgoing calls and answers incoming calls.

*ANS

The connection is made by the IBM System i5 when it answers an incoming call from this controller. If a call is received from the remote controller and all necessary conditions are met, the incoming call is answered by the system.

For X.25 connections, the line attached to the controller requires switched virtual circuits (SVCs) configured on the LGLCHLE parameter of type OUT or BOTH(*SVCOUT or *SVCBOTH) for the connection to succeed.

The line can be changed using the Change Line Description (X.25) (CHGLINX25) command.

Dial initiation (DIALINIT)

Specifies the method used to make the initial dial on a switched line between the system and the remote controller.

*SAME

This value does not change.

*LINKTYPE

The type of dial connection initiated is specified on the LINKTYPE parameter. For LAN or SDLC short-hold mode connections, the default is to dial the connection as soon as the controller description is varied on. For all other link types, the default is to delay dialing.

*IMMED

The dial connection is initiated as soon as the controller description is varied on.

*DELAY

The dial connection is delayed until a job is initiated that requests the use of the remote controller resources.

Connection number (CNNNBR)

Specifies the telephone number to dial to connect to this controller.

*SAME

This value does not change.

*DC

Direct call is being used in an X.21 circuit switched network.

*ANY

The system accepts calls from any network address.

connection-number

Specify the connection number.

Answer number (ANSNBR)

Specifies the X.25 network address from which calls are accepted.

*SAME

This value does not change.

*CNNNBR

Calls from the X.25 network address specified on the CNNNBR parameter are accepted.

*ANY

Calls are accepted from any X.25 network address.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

Outgoing connection list (CNNLSTOUT)

Specifies, for ISDN switched connections, the name of a connection list object that contains the ISDN assigned numbers for a dial out operation to the ISDN.

*SAME

This value does not change.

list-object

Specify the name of a connection list object.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

Connection list entry (CNNLSTOUTE)

Specifies, for ISDN switched connections, the entry name from the connection list that is used to make a call to the ISDN. The connection list must have been identified on the Outgoing connection list (CNNLSTOUT) parameter.

*SAME

This value does not change.

entry-name

Specify an entry name.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

IDLC window size (IDLCWDWSIZ)

Specifies the window size for transmission to and reception controllers attached to the IDLC line.

*SAME

This value does not change.

*LIND

The value specified in the line description is used as the default window size.

window-size

Specify the window size. Valid values range from 1 through 31.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

IDLC frame retry (IDLCFRMRTY)

Specifies the maximum number of attempts to transmit a frame before reporting an error.

*SAME

This value does not change.

*LIND

The number of attempts specified in the line description is used.

IDLC-frame-retry

Specify a number of attempts. Valid values range from 0 through 100.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

IDLC response timer (IDLCRSPTMR)

Specifies the amount of time, in tenths of a second, to wait before retransmitting a frame if acknowledgement has not been received.

*SAME

This value does not change.

*LIND

The time specified in the line description is used.

IDLC-response-timer

Specify an amount of time. Valid values range from 10 through 100 tenths of a second. For example, 100 tenths of a second equals 10 seconds.

Note: This parameter is no longer supported. It exists solely for compatibility with releases earlier than Version 5 Release 3 Modification 0 of operating system.

IDLC connect retry (IDLCCNNRTY)

Specifies the number of times to attempt retransmission at connection time.

*SAME

This value does not change.

*LIND

The number of attempts specified in the line description is used.

*NOMAX

Indicates to continue until a successful transmission has been made.

connect-retry

Specify a number of attempts. Valid values range from 1 through 100.

Predial delay (PREDIALDLY)

Specifies the time interval to wait (in 0.5 second intervals) before dialing a number.

Note: This parameter can be specified only if *YES is specified on either the SWITCHED or SNBU parameter, and LINKTYPE(*SDLC) and SHM(*NO) are both specified.

*SAME

This value does not change.

predial-delay

Specify a value ranging from 0 to 254 units. Each unit represents 0.5 second. To indicate no delay, specify a value of 0.

Redial delay (REDIALDLY)

Specifies the time interval to wait (in 0.5 second intervals) before re-dialing when the call attempt is unsuccessful.

Note: This parameter can be specified only if *YES is specified on either the SWITCHED or SNBU parameter, and LINKTYPE(*SDLC) and SHM(*NO) are both specified.

*SAME

This value does not change.

redial-delay

Specify a value from 0 to 254 units. Each unit represents 0.5 second. To indicate no delay, specify a value of 0.

Dial retry (DIALRTY)

Specifies the number of re-dial attempts made by the system before considering the dialing unsuccessful.

Note: This parameter can be specified only if *YES is specified on either the SWITCHED or SNBU parameter, and LINKTYPE(*SDLC) and SHM(*NO) are both specified.

*SAME

This value does not change.

dial-retry

Specify a value from 0 to 254 in 0.5-second intervals, for the number of times the dialing will be tried.

Switched disconnect (SWTDSC)

Specifies whether the switched connection to this controller is dropped when the last device is varied off.

*SAME

This value does not change.

*NO

The switched connection is not dropped when the last device is varied off.

*YES

The switched connection is varied off when the last device is varied off.

Disconnect timer (DSCTMR)

Specifies options for controlling the time (in seconds) before a connection without activity is dropped, or the amount of time to delay the automatic disconnection. If the user does not want the line to drop, specify *NO for the SWTDSC parameter.

Element 1: Minimum Connect Timer

*SAME

This value does not change.

disconnect-timer

Specify a time to wait before disconnecting. Valid values range from 0 through 65535 seconds.

Element 2: Disconnect Delay Timer

*SAME

This value does not change.

disconnect-delay-timer

Specify a value to delay link take down after the last session on the controller is stopped. Valid values range from 0 through 65535 seconds.

SHM disconnect limit (SHMDSCLMT)

Specifies the number of consecutive nonproductive responses that are required from the remote station before the connection can be suspended for this X.21 short hold mode connection. This parameter is used only if *YES is specified for the Short hold mode (SHM) parameter, and *NEG or *SEC is specified for the Data link role (ROLE) parameter.

*SAME

This value does not change.

*NOMAX

There is no disconnect limit.

SHM-disconnect-limit

Specify a number from 1 to 254, indicating the number of consecutive nonproductive responses that must be received before the connection can be suspended.

SHM disconnect timer (SHMDSCTMR)

Specifies, in tenths of a second, the minimum length of time that the primary system maintains the connection to the remote system for this X.21 short hold mode controller. This parameter is valid only if *YES is specified for the Short hold mode (SHM) parameter, and *NEG or *SEC is specified for the Data link role (ROLE) parameter.

*SAME

This value does not change.

SHM-disconnect-timer

Specify a value from 2 to 3000 in 0.1 second intervals.

Station address (STNADR)

Specifies the station address used when communicating with the controller.

Valid values range from 00 to FE.

Note: 00 can be specified only for APPC controllers when *TDLC is specified for the Link type (LINKTYPE) parameter.

Note: If *SEC is specified on the ROLE parameter, this is the station address of the remote controller. If *PRI or *NEG is specified on the ROLE parameter, this is the local station address.

*SAME

This value does not change.

SDLC poll priority (POLLPTY)

Specifies whether this controller has priority when polled. This parameter can be specified only if SHM is *NO.

*SAME

This value does not change.

*NO

This controller does not have polling priority.

*YES

This controller does have polling priority.

SDLC poll limit (POLLLMT)

Specifies, for an SDLC secondary or negotiable controller, the number of consecutive polls issued to the same controller when the poll results in receiving frames. This parameter can be specified only if SHM is *NO.

*SAME

This value does not change.

0

The default number of polls is zero.

poll limit

Specify a number of polls. Valid values range from 0 through 4.

SDLC out limit (OUTLMT)

Specifies the number of consecutive times SDLC allows the transmission of the maximum number of frames to a station, before allowing transmission to another station.

*SAME

This value does not change.

*POLLLMT

The value is the same as the one specified for the SDLC poll limit (POLLLMT) parameter.

out-limit

Specify a value ranging from 0 through 4.

SDLC connect poll retry (CNNPOLLRTY)

Specifies the number of times to retry connecting to a controller before reporting an error.

*SAME

This value does not change.

*CALC

The number of retries is 7 if the controller is switched, and *NOMAX if the controller is nonswitched.

*NOMAX

The system will retry indefinitely.

connect-poll-retry

Specify a value ranging from 0 to 65534 for the number of retries.

SDLC NDM poll timer (NDMPOLLTMR)

Specifies the minimum interval at which a secondary station should be polled if a poll from the primary to the secondary (which is in normal disconnect mode (NDM)) does not result in receiving the appropriate response.

This parameter is valid only if the link type is *SDLC and the controller role is secondary or negotiable and *NO is specified on the SHM parameter.

*SAME

This value does not change.

*CALC

The poll interval is calculated by the system.

NDM-poll-timer

Specify a value ranging from 1 to 3000 units. Each unit represents 0.1 second. To indicate no timer, specify 0.

LAN remote adapter address (ADPTADR)

Specifies the 12-character adapter address of the remote controller. This is the address to which the system sends data when it communicates with the remote controller. This value can be obtained from the remote controller's configuration record. Valid values range from hex 000000000001 through hex FFFFFFFFFFFF.

*SAME

This value does not change.

adapter-address

Specify the adapter address of the remote controller.

LAN DSAP (DSAP)

Specifies the destination service access point (DSAP). This is the logical address this system will send to when it communicates with the remote controller. This address allows the controller to properly route the data that comes from this system. The default value for the destination service access point is 04.

The value must match the value specified on the source service access point (SSAP) parameter in the remote controller's configuration record.

Note: The *OPC controller uses the value above for this field. The combination of RMTSYSNAME and DSAP defines a unique controller. This allows multiple controllers to exist between two systems.

*SAME

This value does not change.

destination-service-access-point

Specify a hexadecimal value ranging from 04 through 9C, in increments of 4 (for example, 04, 08, 0C, 10) to represent the destination service access point.

LAN SSAP (SSAP)

Specifies the source service access point (SSAP). This is the logical address the local system uses when it sends data to the remote controller. This address allows the controller to properly route the data that comes from the local system. The default value for the source service access point is 04.

It must match the value assigned to the destination service access point (DSAP) in the remote controller's configuration record.

*SAME

This value does not change.

source-service-access-point

Specify a hexadecimal value ranging from 04 through 9C, in increments of 4 (for example, 04, 08, 0C, 10) to represent the source service access point.

LAN frame retry (LANFRMRTY)

Specifies the number of times to retry a transmission when there is no acknowledgment from the remote controller in the time period specified by the LANRSPTMR parameter. This value is only used after a successful connection has been made.

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-frame-retry

Specify a value ranging from 0 through 254 for the number of times a frame is transmitted before an acknowledgement is received.

LAN connection retry (LANCNNRTY)

Specifies the number of times a transmission is attempted before an acknowledgement is received. This value is used at connection time (unlike LANFRMRTY which is used after a connection has been made).

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-connection-retry

Specify a value ranging from 0 through 254 for the number of times the transmission is attempted before an acknowledgement is received.

LAN response timer (LANRSPTMR)

Specifies the time period used to determine an inoperative condition on the link when connected.

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-response-timer

Specify a value from 1 to 254 units. Each unit represents 0.1 second. To indicate no timer, specify 0.

LAN connection timer (LANCNNTMR)

Specifies the time period used to determine an inoperative condition on the link at connection time.

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-connection-timer

Specify a value ranging from 1 through 254 in 0.1-second intervals for the amount of time the system waits before an inoperative condition occurs. To indicate no timer, specify 0.

LAN acknowledgement timer (LANACKTMR)

Specifies the time interval to delay sending acknowledgements for received frames.

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-acknowledgement-timer

Specify a value ranging from 1 to 254 units. Each unit represents 0.1 second. To indicate no timer, specify 0. If 0 is specified for the LAN acknowledgement frequency (LANACKFRQ) parameter, 0 must also be specified for this parameter. If a non-zero number is specified for the LANACKFRQ parameter, a non-zero number must also be specified for this parameter.

LAN inactivity timer (LANINACTMR)

Specifies the time period used to determine an inactive condition for the controller.

*SAME

This value does not change.

*CALC

The system determines the timer value.

LAN-inactivity-timer

Specify a value ranging from 1 through 255 in 0.1-second intervals for the length of time used to determine an inactive condition for the controller. To indicate no timer, specify 0.

LAN acknowledgement frequency (LANACKFRQ)

Specifies the maximum number of frames received before sending an acknowledgement to the controller.

*SAME

This value does not change.

*CALC

The system determines the LAN acknowledgement frequency value.

LAN-acknowledge-frequency

Specify a value from 0 to 127 for the number of frames received. If 0 is specified for the LAN acknowledgement timer (LANACKTMR) parameter, 0 must also be specified for this parameter. If a non-zero number is specified for the LANACKTMR parameter, a non-zero number must also be specified for this parameter.

LAN max outstanding frames (LANMAXOUT)

Specifies the maximum number of frames that can be sent before an acknowledgement is received from the remote system.

*SAME

This value does not change.

*CALC

The system determines the LAN maximum outstanding frames value.

LAN-maximum-outstanding-frames

Specify a value ranging from 1 through 127 for the number of frames that can be sent before an acknowledgement is received.

LAN access priority (LANACCPTY)

Specifies the priority used for accessing the remote controller. The larger the number the higher the priority for this controller. This parameter is only used when the controller attaches to TRLAN.

*SAME

This value does not change.

*CALC

The system determines the LAN access priority value.

LAN-access-priority

Specify a value from 0 to 3 for the access priority for this controller on a local area network (LAN).

LAN window step (LANWDWSTP)

Specifies whether to reduce to 1 the maximum number of frames outstanding to the remote system during network congestion. This parameter (LAN Window Step) indicates the number of frames that must be successfully received by the remote system before the number of maximum outstanding frames can be increased by 1. The increase continues this way until the maximum number of outstanding frames reaches the value specified by the LAN maximum outstanding frames (LANMAXOUT) parameter.

*SAME

This value does not change.

*NONE

The number of outstanding frames is not reduced during network congestion.

LAN-window-step

Specify a value from 1 to 127 for the number of frames that must be successfully received by the remote system before the maximum number of outstanding frames can be increased by 1.

X.25 network level (NETLVL)

Specifies the level of the X.25 network used to access this controller. The level is specified by giving the year of the standard used by the X.25 network.

Note: Use of the lower value of the remote DTE or the network level is suggested; for example, if the remote DTE is using the CCITT standard of 1980 and the network 1984, specify 1980 for this parameter.

*SAME

This value does not change.

1980

The 1980 Standard is used.

1984

The 1984 Standard is used.

1988

The 1988 Standard is used.

X.25 link level protocol (LINKPCL)

Specifies the link level protocol used on the X.25 network to communicate with this controller.

*SAME

This value does not change.

*QLLC

The Qualified Logical Link Control (QLLC) protocol is used.

*ELLC

The Enhanced Logical Link Control (ELLC) protocol is used.

X.25 connection password (CNNPWD)

Specifies the X.25 network password used for password exchange with the X.24 Call Request and Incoming Call packets (Call User Data field). This parameter is not valid for permanent virtual circuit (PVC) connections.

If you want to use a connection password that consists of characters whose hexadecimal value is less than 40, you must specify the password as a hexadecimal value. When less than 8 bytes are specified, the end of the password field is padded with blanks. A password of all blank is valid. All incoming call requests must match this password to establish a connection.

To specify a hexadecimal password, the digits must be specified in multiples of two, be no more than 16 digits long, be enclosed in apostrophes, and be preceded by an X. For example, X'0102030405' is a valid hexadecimal password.

Note: This connection password is highly recommended for controllers that operate with the Enhanced Logical Link Control (ELLC) protocol LINKPCL(*ELLC) on switched virtual circuit (SVC) connections. This enhanced protocol supports reconnection of virtual circuits after network errors which disconnect the line with a clear signal; however, this reconnection is not allowed to proceed without the password validation procedure being used as a unique identifier for the controller.

*SAME

This value does not change.

*NONE

No connection password is used.

X.25-connection-password

Specify the connection password. The password for each controller can consist of any alphanumeric characters represented by the hexadecimal values ranging from 40 through FF.

X.25 switched line selection (SWTLINSLCT)

Specifies the method that is used to select lines from an X.25 switched line list.

*SAME

This value does not change.

*FIRST

Lines are selected beginning with the first line in the switched line list.

*CALC

The system determines which line in the switched line list will be selected.

X.25 default packet size (DFTPKTSIZE)

Specifies the default packet size used by the X.25 network for transmission and reception.

The possible transmission values are:

*SAME

This value does not change.

*LIND

The value specified in the line description is the default value.

transmit-packet-size

Specify a default packet size for transmission. The valid values for the packet size are 64, 128, 256, 512, 1024, 2048, and 4096.

The possible reception values are:

*SAME

This value does not change.

*LIND

The value specified in the line description is the default value.

*TRANSMIT

The value specified as the default packet size for transmission is used as the default for reception.

receive-packet-size

Specify a default packet size for reception. The valid values for the packet size are 64, 128, 256, 512, 1024, 2048, and 4096.

X.25 default window size (DFTWDWSIZE)

Specifies the default window size for transmission and reception.

Element 1: Transmit Window Size

*SAME

This value does not change.

*LIND

The value specified in the line description is used as the default window size.

transmit-window-size

Specify the appropriate default window size. If you specified modulus 8, valid values range from 1 through 7. If you specified modulus 128, valid values range from 1 through 15. For switched virtual circuit (SVC) incoming calls, the system accepts the window size indicated in the Incoming Call packet facilities field.

Element 2: Receive Window Size

*SAME

This value does not change.

*LIND

The value specified in the line description is used as the default window size.

*TRANSMIT

The value specified as the default window size for transmission is used as the default for reception.

receive-window-size

Specify the appropriate default window size. If you specified modulus 8, valid values range from 1 through 7. If you specified modulus 128, valid values range from 1 through 15.

X.25 user group identifier (USRGRPID)

Specifies the closed user-group ID for contacting this switched virtual circuit (SVC) controller on the X.25 network.

Specify the 2-digit decimal value, from 00 through 99, as provided by the network subscription. This parameter is not valid for permanent virtual circuit (PVC) connections. It is valid only for SVC circuit outgoing call operations and is ignored for SVC incoming call connections.

*SAME

This value does not change.

*NONE

A value is not specified for the user group identifier.

X.25 reverse charging (RVSCRG)

Specifies whether reverse charges are accepted or requested when contacting this controller.

*SAME

This value does not change.

*NONE

No reverse charging for network tariff billing is accepted.

*REQUEST

Charges are requested on outgoing call request packets.

*ACCEPT

Reverse charging for network tariff billing is accepted on incoming requests.

*BOTH

Both incoming and outgoing requests are accepted.

X.25 frame retry (X25FRMRTY)

Specifies the maximum number of times a frame is sent after the response timer ends when connected to this controller. The value for this parameter depends on the quality of service provided by the network and the connection to that network; that is, the frequency of lost link protocol data units.

*SAME

This value does not change.

X.25 frame retry

Specify a value ranging from 0 through 21 for the number of times a frame is sent.

X.25 connection retry (X25CNNRTY)

Specifies the maximum number of times that a logical link control (LLC) protocol data unit is sent after the connect response timer expires when connecting to this controller.

*SAME

This value does not change.

X.25 connection retry

Specify a value ranging from 0 through 21 for the number times a frame is sent.

X.25 response timer (X25RSPTMR)

Specifies the time period allowed to return an acknowledgement when an LLC protocol data unit is sent while connected to this controller.

*SAME

This value does not change.

X.25 response-timer

Specify an amount of time in tenths of a second. Valid values range from 1 through 2550 in 0.1-second intervals.

X.25 connection timer (X25CNNTMR)

Specifies the time period allowed to return an acknowledgement when an LLC protocol data unit is sent while connecting to this controller.

*SAME

This value does not change.

connection-timer

Specify an amount of time in tenths of a second. Valid values range from 1 through 2550 in 0.1 second intervals.

X.25 delayed connection timer (X25DLYTMR)

Specifies the time interval between attempts to establish a connection to the controller.

*SAME

This value does not change.

*CALC

Use the values specified for the X.25 connection timer (X25CNNTMR) parameter and the X.25 connection retry (X25CNNRTY) parameter to determine how often and how many times to try establishing the connection.

X.25-delay-timer

Specify a value ranging from 1 to 32767 units. Each unit represents 0.1 second. Connection attempts are repeated indefinitely at this time interval.

X.25 acknowledgement timer (X25ACKTMR)

Specifies the amount of time to delay sending acknowledgements for received frames.

*SAME

This value does not change.

X.25-acknowledgment-timer

Valid values range from 1 to 2550 in 0.1 second intervals, or 0 to indicate no delay.

X.25 inactivity timer (X25INACTMR)

Specifies the time period used to determine an inactive condition for the controller. Valid values range from 1 to 2550 in 0.1 second intervals.

*SAME

This value does not change.

User facilities (USRFCL)

Specifies a string of hexadecimal characters sent to the X.25 network to request additional services. The system allows up to 218 hexadecimal characters.

*NONE

A value is not specified for the user facilities.

*SAME

This value does not change.

APPN CP session support (CPSSN)

Specifies whether this controller supports sessions between control points.

*SAME

This value does not change.

*YES

This controller supports sessions between control points.

*NO

This controller does not support sessions between control points.

Remote APPN node type (NODETYPE)

Specifies the type of APPN node which this controller represents.

*SAME

This value does not change.

*ENDNODE

This node is an end node in an APPN network.

*NETNODE

This node is a network node in an APPN network.

*LENNODE

This node is a low-entry networking node in an APPN network.

*CALC

The system determines the type of node this controller represents.

Branch extender role (BEXROLE)

Specifies the role of the local system in an APPN network for the remote controller being configured. This parameter is only used when the local system has enabled the branch extender function via the NODETYPE parameter in the network attributes being set to *BEXNODE.

*SAME

This value does not change.

*NETNODE

The local system takes the role of a network node for the remote controller.

*ENDNODE

The local system takes the role of an end node for the remote controller.

APPN/HPR capable (HPR)

Specifies whether the local system can use APPN high-performance routing (HPR) when communicating with this controller. The controller description must specify APPN(*YES) to enable HPR. If HPR(*YES) is specified, the value of the MAXFRAME parameter of the line specified by the switched line list must be greater than or equal to 768, otherwise HPR will not be enabled over this connection.

*SAME

This value does not change.

*YES

The local system can use HPR, and HPR flows can proceed over the link defined by this controller.

*NO

The local system cannot use HPR, and HPR flows cannot proceed over the link defined by this controller.

HPR path switching (HPRPTHSWT)

Specifies whether an attempt is made to switch paths of HPR connections associated with this controller at the time the controller is varied off. If a path switch is not attempted or if there are no other available paths, jobs associated with the HPR connections will be ended.

See the APPN information in the Networking category in the IBM i Information Center at http://www.ibm.com/systems/i/infocenter/ for more information.

*SAME

This value does not change.

*NO

When this controller is varied off path switching will not be done for HPR connections associated with this controller. Jobs associated with HPR connections will be ended.

*YES

When this controller is varied off an attempt to switch paths of HPR connections associated with this controller will be made.

APPN transmission group number (TMSGRPNBR)

Specifies the transmission group number for this controller.

*SAME

This value does not change.

*CALC

The system specifies the value for the transmission group number.

transmission-group-number

Specify a value from 1 to 20 for the transmission group number.

APPN minimum switched status (MINSWTSTS)

Specifies the minimum status of the switched connection so that APPN will consider it as a controller that is available for routing.

*SAME

This value does not change.

*VRYONPND

APPN will consider the controller available for routing if the status is vary on pending, varied on, or active.

*VRYON

APPN will consider the controller available for routing only if the status is varied on or active.

Autocreate device (AUTOCRTDEV)

Specifies whether device descriptions can be automatically created for this controller description.

Note: This parameter does not apply to the automatic creation of APPC devices. This parameter only applies to dependent devices on this controller.

*SAME

This value does not change.

*ALL

All dependent devices than can be automatically created for this controller, except APPC devices, are automatically created.

*NONE

Dependent devices on this controller are not automatically created.

Autodelete device (AUTODLTDEV)

Specifies the number of minutes an automatically created device can remain in an idle state (when there are no active conversations on that device). When the time expires, the system automatically varies off and deletes the device description.

*SAME

This value does not change.

*NO

The system will not automatically vary off and delete the automatically-configured idle device descriptions.

1-31680

Specify the number of minutes to wait before deleting the automatically-configured idle device descriptions for this controller. Valid values range from 1 to 31680 minutes (22 days).

User-defined 1 (USRDFN)

This field is used to describe unique characteristics of the line that you want to control. This parameter is valid only if advanced peer-to-peer networking (APPN) is used on the system.

*SAME

This value does not change.

*LIND

The user-defined value specified in the line description is used.

user-defined

Specify a value ranging from 0 through 255.

User-defined 2 (USRDFN)

This field is used to describe unique characteristics of the line that you want to control. This parameter is valid only if advanced peer-to-peer networking (APPN) is used on the system.

*SAME

This value does not change.

*LIND

The user-defined value specified in the line description is used.

user-defined

Specify a value ranging from 0 through 255.

User-defined 3 (USRDFN)

This field is used to describe unique characteristics of the line that you want to control. This parameter is valid only if advanced peer-to-peer networking (APPN) is used on the system.

*SAME

This value does not change.

*LIND

The user-defined value specified in the line description is used.

user-defined

Specify a value ranging from 0 through 255.

Recovery limits (CMNRCYLMT)

Specifies the number of recovery attempts made by the system before an inquiry message is sent to the system operator. Also specifies the time (in minutes) that must elapse before the system sends an inquiry message to the system operator indicating that the recovery attempt count limit is reached.

Element 1: Maximum Recovery Limit

*SAME

This value does not change.

*SYSVAL

The value in the QCMNRCYLMT system value is used.

count limit

Specify the number of second-level recovery attempts to be made. Valid values range from 0 through 99.

Element 2: Recovery Time Interval

time-interval

Specify the time interval (in minutes) at which the specified number of second-level recoveries are attempted. Valid values range from 0 through 120. If the value specified for count-limit is not 0, the value 0 specifies infinite recovery.

More information on communication recovery is in the Communcations Management book, SC41-5406.

Message queue (MSGQ)

Specifies the message queue to which operational messages are sent.

*SAME

This value does not change.

*SYSVAL

Messages are sent to the message queue defined in the QCFGMSGQ system value.

*SYSOPR

Messages are sent to the system operator message queue (QSYS/QSYSOPR).

Qualifier 1: Message queue

name

Specify the name of the message queue to which operational messages are sent.

Qualifier 2: Library

name

Specify the name of the library where the message queue is located.

Model controller description (MDLCTL)

Indicates whether or not this controller is a 'Model' for automatically created controller descriptions. Values on the model description, such as timer delays, retry limits, and frame size, are used for new controller descriptions that are automatically created and configured when communications with a remote system is started. The new controller must be attached to one of the SINGLE line descriptions in the switched line list (SWTLINLST parameter) of the model controller.

A model controller description is not attached to any devices, and only one controller description can be varied on for each line description.

For more information on model controllers, see the APPN information in the Networking category in the IBM i Information Center at http://www.ibm.com/systems/i/infocenter/.

Note: This parameter is only valid if the parameter LINKTYPE is *LAN.

*SAME

This value does not change.

*NO

This controller is not a model controller.

*YES

This controller is a model controller.

Connection network ID (CNNNETID)

Specifies the connection network identifier of this controller description. If a value is specified for this parameter (other than none), this controller description represents this connection to the connection network.

*SAME

This value does not change.

*NETATR

The LCLNETID value specified in the system network attributes is used.

*NONE

There is no connection network identifier.

connection-network-netid

Specify the connection network identifier that represents this controller description to the network.

Connection network CP (CNNCPNAME)

Specifies the name of the connection network control point.

A connection network is defined to allow controller descriptions to be automatically created for incoming or outgoing connections. This parameter is valid only if MDLCTL(*YES) is specified; it is required if CNNNETID is specified.

*SAME

This value does not change.

*NONE

No connection network control point name is specified.

connection-control-point-name

Specify the connection control point name.

Control owner (CTLOWN)

Specifies whether the user is allowed to change the controller description. If the user is the current owner, ownership cannot be transferred back to the system.

*SAME

This value does not change.

*USER

The user can make changes to the controller description.

Text 'description' (TEXT)

Specifies the text that briefly describes the object.

*SAME

This value does not change.

*BLANK

No text is specified.

character-value

Specify no more than 50 characters of text, enclosed in apostrophes.

Examples

Example 1: Changing APPC Controller CHICAGO Configuration

CHGCTLAPPC   CTLD(CHICAGO)  ONLINE(*YES)
             TEXT('Controller in Chicago')

This command changes the APPC controller named CHICAGO to be varied on at IPL and a new text description is specified.

Example 2: Changing the APPC Controller CJG Configuration

CHGCTLAPPC   CTLD(CJG) LCLINTNETA('9.5.5.1')
             LDLCLNKSPD(*WAN)

This command changes the APPC controller named CJG to local internet address 9.5.5.1 and LDLC (Logical Data Link Control) link speed to *WAN.

Error messages

*ESCAPE Messages

CPF2652

Controller description &1 not changed.