README.TXT: Patch 13 for SNA Server 2.0

ID: Q114044

The information in this article applies to:

Microsoft SNA Server for Windows NT, version 2.0

SUMMARY

The following is the readme file that accompanies SNA Server 2.0 patch 13 (sna20.p13):

Note that this article reflects the text of a static document. Therefore, some of the information in this article may be outdated. For example, as of May 20, 1996, Microsoft no longer maintains support forums on CompuServe.

MORE INFORMATION

******************* Beginning of Readme ***************************

Product: Microsoft SNA Server for Windows NT v2.0 Update: Patch #13 Status: Confirmed

Module updated:

   SYSTEM\SNADLC.DLL  12/10/93  01:09a  74240  (2.0.0.133)
   SYSTEM\HWSETUP\SNADLC\SNADLC.DLL (same file as above)

Date: December 10, 1993

Bugs fixed:

1773 SNA Server DLC link service performance improvements

The SNA Server DLC link service currently uses inefficient DLC timers leading to slower performance. Also, SNA Server DLC connection timer settings in the configuration file were being ignored. Changes include:

1. The dynamic window increment value is now set to 2. This value is the MAXOUT_INCR value mentioned below.

2. The DLC timer values are now correctly picked up from the configuration file (ie: t1, t2, ti - recommend leaving at Default).

3. The maximum retry count is now picked up correctly from the configuration file.

Using SNA Server Admin, the SNA Server 802.2 connection setup dialog should be configured as follows:

Receive ACK Threshold:          8  (MAXIN  below)
Unacknowledged Send Limit:      16 (MAXOUT below)

The actual values can be changed, but the ratio of 1:2 should be maintained. Existing defaults are 2 and 1, which are incorrectly set. Also, the existing dynamic window size is 0 and maximum is 1.

The IBM LAN technical reference manual says:

The dynamic window increment value is used to reduce bridge congestion. If the two end points are on different rings, and the adapter detects an error condition requiring retransmission, the MAXOUT parameter is set to 1. It is then incremented by 1 each time MAXOUT_INCR frames are acknowledged by the remote station, until it reaches the value requested by the application program.

Using the configuration values above, after congestion, every time two frames are acknowledged, the MAXOUT value is increased by 1 back to a maximum of 16.

Update Procedure:

- Stop the SNABASE service at the server by entering "NET STOP SNABASE". Warning: This will stop all SNA Server services on the server.

- Copy updated SNADLC.DLL to the SNA Server SYSTEM and SYSTEM\HWSETUP\SNADLC directories.

- Restart SNABASE and the SNA Server service.

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SNA Server 2.0 patches are located on:

1. Library #2 of the MSSNA Compuserve forum.

2. The Internet server under BUSSYS\SNASRVR\SUP-ED\FIXES\ (supported

   patches) OR on BUSSYS\SNASRVR\UNSUP-ED\FIXES\ (unsupported patches).

Additional query words: prodsna

Keywords          : kbnetwork ntdistrib 
Version           : 2.0
Platform          : WINDOWS

Last Reviewed: April 18, 1997