Configuring SNA Server to Talk to AS/400 Over SDLC
ID: Q112159
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The information in this article applies to:
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Microsoft SNA Server, versions 2.0, 2.1, 2.11, 2.11 SP1, 3.0, 3.0 SP1, 3.0 SP2, 3.0 SP3, 4.0, 4.0 SP1
SUMMARY
This article describes how to configure SNA Server to communicate with an
AS/400 over an Synchronous Data Link Control (SDLC) switched (dial-up)
line, to support 5250 emulation.
NOTE: The end of this article includes sample AS/400 configuration screens.
MORE INFORMATION
These instructions assume all of the following:
- The SNA Server SDLC link service has been installed using the SNA Server
setup program (and any interrupt conflicts have been resolved, per the
SNA Server Readme.txt file).
- The system has been restarted.
- AS/400 APPC controller and device description has been configured off
the AS/400 SDLC line to be used (see below for sample AS/400 APPC
controller and device descriptions).
Configure the following entries using the SNA Server Admin program:
- Zoom on the SNA Server service (which appears as the Windows NT computer name), located in the Servers and Connections window of Admin. Enter the following parameters:
SNA Network Control Point Name
Network Name = APPN (or Remote Network ID, RMTNETID value on the
AS/400).
Control Point Name = This is the remote control point name
(RMTCPNAME) value in the AS/400 APPC controller
definition. For simplicity, this should be set to
the local Windows NT computer name.
Choose OK.
- Add a new Local APPC LU off the server service by clicking Insert and entering the following parameters:
LU 6.2 Type = Independent
LU Alias = For simplicity, this should be the same as the
Local LU Name below.
Network Name = APPN (or Remote Network ID, RMTNETID value on the
AS/400).
LU Name = This is the remote control point name in the AS/400
APPC controller description (RMTCPNAME).
All other entries can remain at default values.
NOTE: It is most efficient for all SNA Server users to use the same
Local APPC LU. However, it is possible to create a unique LU for each
user if desired, where the LU alias and LU name above could be
replaced with the actual user name (though this requires additional
administration to maintain).
- Select OK.
- Configure the SNA Server SDLC connection by zooming on the connection name:
Link Service = SnaSdlc1 (or name specified during SNA setup)
Remote End = Peer System
Activation = If set to "On Demand" (default), then the Switched
disconnect (SWTDSC) value on the AS/400 controller
definition should be set to YES. This causes the
underlying link to drop when there are no active
sessions. Otherwise, if SWTDSC is set to NO, then SNA
Server should be set to activate On Server Startup.
Allowed Directions = Outgoing calls.
Zoom on the Setup button:
Dial data = Recommend to leave blank, and configure for modem-stored
number dialing (assuming this is a dial-up link).
Local Node ID = EXCHID value on the AS/400 controller description
Remote Node Name:
Network Name = APPN (or Remote Network ID, RMTNETID value on the
AS/400).
Control Point Name = AS/400 local control point name, configured in
the AS/400 Display Network Attributes screen.
Remote Node ID = Not used (leave blank)
Zoom on Advanced options:
XID Type = Format 3
Encoding = (NRZ or NRZI). Must match the NRZI data encoding scheme
(NRZI) configured on the AS/400 line description.
Duplex = Must match the DUPLEX setting configured in the AS/400
line description.
Poll Address = Must match the Station address (STNADR) setting on
the AS/400 controller definition
The remaining options can be left at the default
Choose OK.
- Add a new Remote APPC LU off the connection by choosing the Insert
button and entering the following parameters:
LU Alias = For simplicity, this should be the same as the
Remote APPC LU Name below.
Network Name = APPN (or remote network id RMTNETID value on the
AS/400)
LU Name = Must be set to the AS/400 local control point name
(set in the AS/400 Display Network Attributes screen).
Uninterpreted LU Name = Not used (leave at default).
Select Supports Parallel Sessions (required).
Zoom on the Partners button. The Remote APPC LU must be partnered
with the Local APPC LU created above, using the QPCSUPP mode. Because
Enable Automatic Partnering is enabled by default for APPC LUs, this
pairing will already be added.
Choose OK.
- Save the SNA Server configuration file and restart the SNA Server
service. Once the SNA Server service is Active, all connections
configured to activate on server startup will go into a Pending state,
then switch to Active.
NOTE: If the connection stays in Pending mode and doesn't activate:
- Check the Windows NT application event log (using Event Viewer) to
see the reason why the connection isn't activating. If the SDLC link
service isn't activating, check the system event log for any entries
logged by the IBMSYNC driver (indicating possible hardware
conflicts), or the Service Control Manager (indicating why the link
service was unable to start).
- Double check the configuration entries above with your AS/400 system administrator and make sure the AS/400 line is active. If all appears okay, check the SNA Server controller description on the AS/400.
- Check if the AS/400 is logging any errors when SNA Server attempts to establish the connection.
- If the connection activates but users are unable to open 5250
sessions, zoom on the Status button on the Local APPC LU, which
should show the following (when working correctly):
Partner LU Mode Connection Sessions Limit
<remote LU> SNASVCMG <connection> 0 2
<remote LU> QPCSUPP <connection> 0 64
This means that up to 64 sessions are available for use, though
no sessions are currently active.
At this point, a 5250 user can then open any valid APPC LU/LU pair
supported by any SNA Server in the domain. However, to simplify 5250 user
access through SNA Server, there are various options available to an SNA
Server administrator and the 5250 user, including the following:
- Default AS/400 session for a user: On the SNA Server user/group record,
the administrator can define default local and remote APPC LUs. If
defaults are configured, and the 5250 applet is used, this is the LU/LU
pair the 5250 user opens when the 5250 applet local and partner APPC LU
names are left blank.
- If default APPC LUs are not preassigned to a user/group, here is how to configure pools of Local APPC LUs and Remote (partner) APPC LUs to
simplify 5250 user access to one or more AS/400's supported by SNA
Server:
Local APPC LU pool: Define the Local APPC LU as a "Member of Default
Outgoing Local APPC LU Pool". If a 5250 user does not enter a Local APPC
LU when opening a session, the user accesses one of the available Local
LUs in this pool.
Remote APPC LU pool: The Remote APPC LU pool is determined by the Remote
LUs which are partnered with the Local APPC LU and the QPCSUPP mode. So
if a Local APPC LU is specified, but the Remote APPC LU is left blank, a
5250 session is allocated from an available Remote APPC LU that it is
partnered with.
SAMPLE CONFIGURATION SETTINGS
The following AS/400 configuration screens are shown below, along with
their corresponding configuration setting for SNA Server (see comments
which are preceded with "****" below). This includes the AS/400 network
attributes screen, SDLC (switched) line description, APPC controller, and
virtual device description. Many of the configuration settings are not
relevant for communications to function, though are shown here for
completeness.
AS/400: Display Network Attributes
System: OLYMPIA
Current system name . . . . . . . . . . . . . . : OLYMPIA
Pending system name . . . . . . . . . . . . . :
Local network ID . . . . . . . . . . . . . . . . : APPN
**** Must match the remote network name on the SNA Server connection.
Local control point name . . . . . . . . . . . . : OLYMPIA
**** Must match the remote control point name on the SNA Server connection.
Default local location . . . . . . . . . . . . . : OLYMPIA
Default mode . . . . . . . . . . . . . . . . . . : BLANK
APPN node type . . . . . . . . . . . . . . . . . : *ENDNODE
Maximum number of intermediate sessions . . . . : 200
Route addition resistance . . . . . . . . . . . : 128
Server network ID/control point name . . . . . . : APPN REDHOOK
Alert status . . . . . . . . . . . . . . . . . . : *OFF
Alert logging status . . . . . . . . . . . . . . : *NONE
Alert primary focal point . . . . . . . . . . . : *NO
Alert default focal point . . . . . . . . . . . : *NO
Alert backup focal point . . . . . . . . . . . . :
Network ID . . . . . . . . . . . . . . . . . . : *NONE
Alert focal point to request . . . . . . . . . . :
Network ID . . . . . . . . . . . . . . . . . . : *NONE
Alert controller description . . . . . . . . . . : *NONE
Alert hold count . . . . . . . . . . . . . . . . : 0
Alert filter . . . . . . . . . . . . . . . . . . : *NONE
Library . . . . . . . . . . . . . . . . . . . :
Message queue . . . . . . . . . . . . . . . . . : QSYSOPR
Library . . . . . . . . . . . . . . . . . . . : QSYS
Output queue . . . . . . . . . . . . . . . . . . : QPRINT
Library . . . . . . . . . . . . . . . . . . . : QGPL
Job action . . . . . . . . . . . . . . . . . . . : *FILE
Maximum hop count . . . . . . . . . . . . . . . : 16
DDM request access . . . . . . . . . . . . . . . : *OBJAUT
PC Support request access . . . . . . . . . . . : *OBJAUT
Default ISDN network type . . . . . . . . . . . :
Default ISDN connection list . . . . . . . . . . : QDCCNNLANY
AS/400: Change Line Desc (SDLC) (CHGLINSDLC)
Line description . . . . . . . . LIND > NEWLINE
Resource names . . . . . . . . . RSRCNAME > LIN011
+ for more values
Online at IPL . . . . . . . . . ONLINE > *NO
Data link role . . . . . . . . . ROLE > *NEG
Physical interface . . . . . . . INTERFACE > *RS232V24
Connection type . . . . . . . . CNN > *SWTPP
Vary on wait . . . . . . . . . . VRYWAIT > *NOWAIT
Autocall unit . . . . . . . . . AUTOCALL > *NO
Exchange identifier . . . . . . EXCHID > 05600001
NRZI data encoding . . . . . . . NRZI > *YES
**** Must match the encoding setting configured in the SNA Server
connection (located under the Advanced settings).
Maximum controllers . . . . . . MAXCTL > 1
Clocking . . . . . . . . . . . . CLOCK > *MODEM
Line speed . . . . . . . . . . . LINESPEED > 9600
Modem type supported . . . . . . MODEM > *NORMAL
Switched connection type . . . . SWTCNN > *BOTH
Autoanswer . . . . . . . . . . . AUTOANS > *YES
**** With Autoanswer=YES, the AS/400 is answering the phone, so the SNA
Server connection should be set to "Allowed directions = Outgoing." Also,
SNA Server should be configured as "Remote end = Peer."
Autodial . . . . . . . . . . . . AUTODIAL > *NO
Calling number . . . . . . . . . CALLNBR > *NONE
Station address . . . . . . . . STNADR > C1
Connect poll retry . . . . . . . CNNPOLLRTY > 10
Maximum frame size . . . . . . . MAXFRAME > 521
Duplex . . . . . . . . . . . . . DUPLEX > *HALF
**** Matches the SNA Server SDLC connection duplex setting (located under
the advanced settings).
Inactivity timer . . . . . . . . INACTTMR > 300
Poll response delay . . . . . . POLLRSPDLY > 0
Nonproductive receive timer . . NPRDRCVTMR > 320
Idle timer . . . . . . . . . . . IDLTMR > 30
Connect poll timer . . . . . . . CNNPOLLTMR > 30
Poll cycle pause . . . . . . . . POLLPAUSE > 0
Frame retry . . . . . . . . . . FRAMERTY > 7
Data Set Ready drop timer . . . DSRDRPTMR > 20
**** During our testing, the AS/400 default was too short. This may have to
be set to 20 or more, depending on the modem used.
Autoanswer type . . . . . . . . AUTOANSTYP > *DTR
Remote answer timer . . . . . . RMTANSTMR > 60
Text 'description' . . . . . . . TEXT > 'SHOW DEMO LINE -
DIAL IN LINE'
Additional Parameters
Modem data rate select . . . . . MODEMRATE > *FULL
Error threshold level . . . . . THRESHOLD > *OFF
Modulus . . . . . . . . . . . . MODULUS > 8
Maximum outstanding frames . . . MAXOUT > 7
Clear To Send timer . . . . . . CTSTMR > 25
Link speed . . . . . . . . . . . LINKSPEED > 9600
Cost/connect time . . . . . . . COSTCNN > 128
Cost/byte . . . . . . . . . . . COSTBYTE > 128
Security for line . . . . . . . SECURITY > *NONSECURE
Propagation delay . . . . . . . PRPDLY > *TELEPHONE
User-defined 1 . . . . . . . . . USRDFN1 > 128
User-defined 2 . . . . . . . . . USRDFN2 > 128
User-defined 3 . . . . . . . . . USRDFN3 > 128
Recovery limits: CMNRCYLMT
Count limit . . . . . . . . . > 2
Time interval . . . . . . . . > 5
AS/400: Change Ctl Desc (APPC) (CHGCTLAPPC)
Controller description . . . . . CTLD > TRUTH
Online at IPL . . . . . . . . . ONLINE *NO
APPN-capable . . . . . . . . . . APPN *YES
Switched line list . . . . . . . SWTLINLST SHOW
+ for more values
Character code . . . . . . . . . CODE *EBCDIC
Maximum frame size . . . . . . . MAXFRAME 521
**** Inherited from the SDLC line definition. For best performance, this
setting should match the Max BTU Length setting on the SNA Server SDLC
connection (located under the Advanced settings).
Remote network identifier . . . RMTNETID APPN
**** Must match the network name configured on SNA Server (set using Admin
when zooming on the server name), as well as the network name configured on
the Local APPC LU.
Remote control point . . . . . . RMTCPNAME TRUTH
**** Must match the local control point name configured on SNA Server (set
using Admin when zooming on the server name), as well as the LU name of the
Local APPC LU.
Exchange Identifier . . . . . . EXCHID 00000000-FFFFFFFF
**** Must match the Local Node ID on the SNA Server.
SSCP identifier . . . . . . . . SSCPID *SAME
Initial connection . . . . . . . INLCNN *ANS
Dial initiation . . . . . . . . DIALINIT *SAME
Connection number . . . . . . . CNNNBR *SAME
Predial delay . . . . . . . . . PREDIALDLY 6
Redial delay . . . . . . . . . . REDIALDLY 120
Dial retry . . . . . . . . . . . DIALRTY 2
Switched disconnect . . . . . . SWTDSC *YES
**** If this is YES, then the AS/400 will drop the link when there are no
active APPC sessions, so the SNA Server connection should be configured to
activate On Demand. Otherwise, if SWTDSC is set to NO, the SNA Server
connection should be configured to activate On Server Startup.
Disconnect timer: DSCTMR
Minimum connect timer . . . . 600
**** AS/400 default is 170 sec. AS/400 drops the connection after this time-out when there are no active APPC sessions.
Disconnection delay timer . . 0
Station address . . . . . . . . STNADR C1
**** Inherited from the line description. Must match the poll address
configured in the SNA Server connection (located in the Advanced dialog).
SDLC poll priority . . . . . . . POLLPTY *NO
SDLC poll limit . . . . . . . . POLLLMT 0
SDLC out limit . . . . . . . . . OUTLMT *POLLLMT
SDLC connect poll retry . . . . CNNPOLLRTY 7
SDLC NDM poll timer . . . . . . NDMPOLLTMR *CALC
APPN CP session support . . . . CPSSN *YES
APPN node type . . . . . . . . . NODETYPE *ENDNODE
APPN transmission group number TMSGRPNBR 1
APPN minimum switched status . . MINSWTSTS *VRYONPND
Autodelete device . . . . . . . AUTODLTDEV 1440
User-defined 1 . . . . . . . . . USRDFN1 *LIND
User-defined 2 . . . . . . . . . USRDFN2 *LIND
User-defined 3 . . . . . . . . . USRDFN3 *LIND
Recovery limits: CMNRCYLMT
Count limit . . . . . . . . . 2
Time interval . . . . . . . . 5
Text 'description' . . . . . . . TEXT 'Show controller for Demo
dial-in.'
AS/400: Change Device Desc (APPC) (CHGDEVAPPC)
Device description . . . . . . . DEVD > TRUTH03
**** This device name corresponds with the SNA Server Local APPC LU name
(in this case, TRUTH), plus a two-digit device number, generated by the
AS/400 (but not configured in SNA Server).
Online at IPL . . . . . . . . . ONLINE *NO
Mode . . . . . . . . . . . . . . MODE *NETATR
+ for more values
Message queue . . . . . . . . . MSGQ QSYSOPR
Library . . . . . . . . . . . *LIBL
Local location address . . . . . LOCADR 00
Single session: SNGSSN
Single session capable . . . . *NO
Number of conversations . . .
Locally controlled session . . . LCLCTLSSN *SAME
Pre-established session . . . . PREESTSSN *SAME
Text 'description' . . . . . . . TEXT 'AUTOMATICALLY CREATED
BY QLUS'
Mode description . . . . . . . . MODD > QPCSUPP
**** This should not be changed; this is the default mode name for IBM PC
Support clients (and SNA Server).
Class-of-service . . . . . . . . COS #CONNECT
Maximum sessions . . . . . . . . MAXSSN 64
**** This is the number of sessions supported by the QPCSUPP mode, and
should match the SNA Server session limit configured on the QPCSUPP mode
entry, configured using the SNA Server setup program (zoom on Local or
Remote LU, zoom on Partners button, then select the Modes button).
Maximum conversations . . . . . MAXCNV 64
**** This should match the MAXSSN setting above.
Locally controlled sessions . . LCLCTLSSN 16
Pre-established sessions . . . . PREESTSSN 0
Inbound pacing value . . . . . . INPACING 7
Outbound pacing value . . . . . OUTPACING 7
Maximum length of request unit MAXLENRU *CALC
Text 'description' . . . . . . . TEXT 'created by <name>'
Additional query words:
prodsna snafaq
Keywords : snafaq kbtool ntutil sna211 sna211sp1 sna3 sna3sp1 sna3sp2 sna3sp3 sna4 sna4sp1 sna2 sna21
Version : WINDOWS:2.0,2.1,2.11,2.11 SP1,3.0,3.0 SP1,3.0 SP2,3.0 SP3,4.0,4.0 SP1
Platform : WINDOWS
Issue type :
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