NDIS 4.1 ATM Call Manager Fails to Properly Buffer ILMI Requests |
Q199193
NetShow Theater Server may appear to stop responding or may report a variety of network errors due to a connectivity failure when operating in an ATM environment of FORE switches running ForeThought version 5.3. The ipatm -g and atmadm -a commands may take 30 to 60 minutes before returning a MAC address.
The NDIS 4.1 ATM Call Manager is failing to properly buffer Integrated Local Management Interface (ILMI) requests. When ILMI starts, the Fore Switch sends 12-15 requests to the client, all back to back. One of the key requests is to check whether the client's prefix registration table is empty. If the switch receives Nosuchname for that request, then the switch can provide the prefix to the client and then proceed to the ILMI processing state. The client then registers its address(es). Unfortunately, about 65 percent of the 12-15 requests get dropped by the Windows NT host. Eventually, the host may process the prefix request (between 30 to 60 minutes in lab tests). Previous to ForeThought version 5.3, ILMI 4.0, the Fore switch sent fewer requests, which increased the likelihood that the host would process the requests.
This affects all NetShow Theater Server configurations in an ATM environment using FORE ATM switches that are running ForeThought version 5.3.
A supported fix is now available from Microsoft, but it is only intended to correct
the problem described in this article and should be applied only to systems
experiencing this specific problem. This fix may receive additional testing at a
later time, to further ensure product quality. Therefore, if you are not severely
affected by this problem, Microsoft recommends that you wait for the next service pack that
contains this fix.
To resolve this problem immediately, contact Microsoft Product Support Services
to obtain the fix. For a complete list of Microsoft Product Support Services
phone numbers and information about support costs, please go to the following
address on the World Wide Web:
http://support.microsoft.com/directory/overview.aspNOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
Cmatm.sys version 3.0.0.1355 (dated 10/21/98 10:13am and later)
Increase the NDIS 4.1 ATM Call Manager ILMI buffer counter to 20 in the Cmatm.sys file.
-OR-
Use a production release of ForeThought prior to version 5.3.
Microsoft has confirmed this to be a problem in NetShow Theater Server version 3.0.
To install this fix, do the following:
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