3Com MSR 50 Series Configuration Manual page 2231

If Round-robin is configured, verify whether there are multiple equivalent
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service information items for the service type of the requests. The equivalent
service information items must have the same RIP ticks, RIP hops, SAP hops and
SAP preferences.
IPX Routing Management Troubleshooting
Symptom 1: No dynamic routing protocols are configured on the device. The
physical status and link layer protocol are both UP on an interface, but IPX packets
can not be forwarded normally.
Solution:
Use the display ipx routing-table protocol static command to check
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whether a correct static route is configured.
Use the display ipx routing-table command to verify the static route takes
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effect, and to check whether the next hop address is not specified or not
correct on the non PPP interface.
Symptom 2: The router received a route from a neighbor router, but the route can
not be found using the display ipx routing-table verbose command.
Solution:
Use the display current-configuration command to check whether the
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maximum dynamic route number is configured on a per network basis, with
the corresponding command ipx route max-reserve-path. If it is not
configured, the default value 4 is used.
Use the display ipx routing-table verbose command to check whether the
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existing dynamic route number under the destination network ID has reached
the maximum number.
If the upper limit is reached, the newly received routes will not be added to the
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routing table. You can use the ipx route max-reserve-path command to
adjust the maximum number of dynamic routes.
Troubleshooting IPX Configuration 2231