DOCUMENT:Q166567  28-APR-1999  [exchange]
TITLE   :XCON: How to Enable Lowest Cost Routes Only
PRODUCT :Microsoft Exchange
PROD/VER:4.0,5.0,5.5
OPER/SYS:
KEYWORDS:kbusage

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The information in this article applies to:

 - Microsoft Exchange Server, versions 4.0, 5.0, 5.5 
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SYMPTOMS
========

Microsoft Exchange Server versions 4.0 and 5.0 use certain criteria for routing.
A new feature is planned for Microsoft Exchange Server that will allow cost to
be the first determining factor in routing criteria.

MORE INFORMATION
================

Once you have applied the update referenced below, the location of the new
registry entry is as follows:

   HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/ 
   MSExchangeMTA/Parameters

To enable this feature:

1. Add the following value:

      Use Lowest Cost Routes Only

2. Set the Data Type to REG_DWORD.

3. Set this to a non-zero value.

STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 4.0. This problem has been corrected in the latest U.S. Service Pack for
Microsoft Exchange Server version 4.0. For information on obtaining the Service
Pack, query on the following word in the Microsoft Knowledge Base (without the
spaces):

   S E R V P A C K

This feature is included in the latest Microsoft Exchange Server version 5.0 U.S.
Service Packs. For information on obtaining the Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):

   S E R V P A C K

In Exchange Server version 5.5, this functionality has been included and can be
changed in the Exchange Administrator program on the Message Transfer Agent
(MTA) object. Place a check in the box for Only Use Least Cost Routes.

If you upgrade to Exchange Server version 5.5, it will be necessary to delete the
previous registry entry before making the above change.
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Keywords          : kbusage 
Technology        : kbExchangeSearch kbExchange500 kbExchange550 kbExchange400 kbZNotKeyword2
Version           : 4.0,5.0,5.5
Issue type        : kbbug
Solution Type     : kbfix

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