3Com MSR 50 Series Configuration Manual page 2230

2230 C 128: IPX C
HAPTER ONFIGURATION
Solution:
Use the debugging ipx packet and debugging ipx sap packet verbose
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commands to check packet contents. All incoming and outgoing packets are
displayed in debugging information. If no related packets are displayed,
problems in lower layer network connection may exist.
Use the display ipx interface command to make sure SAP is enabled on the
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interface.
make sure the active route to the server has a hop number less than 16.
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Use the display current-configuration command to check whether the
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updating interval is too long.
Symptom 5: No updates sent out an interface.
Solution:
Use the debugging ipx packet and debugging ipx sap packet verbose
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commands to check packet contents. If such update packets are displayed in
debugging information, it is probably that SAP MTU is larger than the interface
MTU so the packets are discarded by the lower layer.
Use the display ipx interface command to check whether the interface is
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enabled with triggered update. If so, the interface will not periodically
broadcast update packets.
If no SAP packets are sent out the interface, check whether all service
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information is learnt from the interface. If so, split horizon may be the reason
that no service information is sent out the interface.
Symptom 6: SAP does not respond to GNS requests.
Trouble shooting:
Use the debugging ipx sap packet command to check whether GNS request
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packets are received.
Make sure SAP is enabled on the receiving interface.
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Use the display ipx interface command to check whether the interface is
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disabled from responding to GNS requests. If so, use the undo ipx sap
gns-disable-reply command to enable the interface.
Use the display ipx service-table command to check whether the requested
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service information is available in the SIT table. If not, SAP will not respond.
If the requested service information is available, check whether the service
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information is learnt from the interface that received the GNS requests. In that
case SAP will also not respond to the GNS requests.
Symptom 7: SAP does not respond to GNS requests in the Round-robin mode.
Solution:
Use the display current-configuration command to make sure Round-robin
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is configured.