Slow Performance over IBM Software Source Routing Bridge (117715)
The information in this article applies to:
- Microsoft Windows for Workgroups 3.11
This article was previously published under Q117715 3.11 WINDOWS kbnetwork kbprb kbfile
SYMPTOMS Data transfers across a source routing bridge are very slow
or appear to hang. CAUSE Windows for Workgroups (NetBEUI protocol) over a Token Ring
Source Routing Bridge advertises a Largest Frame (LF) size of 8130 bytes.
However, the Maxframe size is negotiated at 156 bytes. This causes very slow
data transfer. A network trace illustrates the problem:
Destination Source Summary
Server WFWClient<00> NETB D=2B S=16 Session initialize
NETB: ----- NETBIOS Session Initialize -----
NETB:
NETB: Header length = 14, Data length = 0
NETB: Delimiter = EFFF (NETBIOS)
NETB: Command = 19
NETB: Flags = 89
NETB: 1... .... = NO.ACK ability
NETB: .... 100. = Largest frame value = 4 <<<8130 bytes -IBM Spec
NETB: .... ...1 = Version 2.0 or higher
NETB: Max data receive size = 156 <<< Small Frame size negotiated.
NETB: Transmit correlator = 0000
NETB: Response correlator = 0016
NETB: Remote session number = 43
NETB: Local session number = 22
If the bridge advertises a size OTHER THAN 8130 bytes, this
problem does not occur. WORKAROUND An updated NETBEUI.386 file is available to correct this
problem. Replace your existing NETBEUI.386 file with the updated version. For
information about how to obtain the updated driver, refer to the More
Information section below. The following options allow you to work
around this problem: - Use the real-mode NetBEUI protocol.
-or-
- Execute "Net start Full" at the command prompt before
running Windows for Workgroups.
-or- - Configure the bridge by changing a Largest Frame size
(smaller or larger).
In a case where an IBM software bridge is used
to connect two 16 MB rings, it is not possible to change the LF size on the
bridge software. In this case, you can bring down the network ring to 4 MB, or
install a hardware bridge.
NOTE: This problem does not occur on LAN Manager/Windows
workstations. STATUS Some of the products discussed here are manufactured by
vendors independent of Microsoft; we make no warranty, implied or otherwise,
regarding these products' performance or reliability.
Modification Type: | Minor | Last Reviewed: | 8/9/2004 |
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Keywords: | kbdownload kbfile kbgraphxlinkcritical KB117715 |
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