3Com 7757 Configuration Manual page 148

148 C 17: IPX C
HAPTER ONFIGURATION
operations: Display the MTU setting on the VLAN interface with the display
interface command and the RIP/SAP packet size with the display ipx interface
command. Check whether the RIP/SAP packet size is smaller than the MTU
setting on the VLAN interface.
Symptom 3: The switch cannot receive SAP packets.
Solutions:
Use the display ipx interface command to check whether SAP is disabled on the
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VLAN interface.
Symptom 4: A type 20 IPX packet cannot be transmitted to other network
segments.
Solutions:
Use the display ipx interface command to check whether the forwarding of
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type 20 IPX packets is enabled on the input and output interfaces.
Use the debugging ipx packet command to enable debugging for IPX packets.
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Check whether there is a prompt message of "Transport Control field of IPX
type-20 packet >= 8!" A type 20 IPX packet can only be forwarded up to eight
times; for the ninth forwarding attempt, the packet is dropped.
Troubleshooting IPX RIP
Symptom 1: The switch cannot learn routes from the peer device.
Solutions:
Use the debugging ipx rip packet verbose command to enable debugging for
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IPX RIP. Check whether there is a RIP packet with routing information from the
peer device to make sure that the underlying connection is available between
the two devices.
If there is a RIP packet with routing information from the peer device, you can
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use the debugging ipx rip event command to check whether the received
routing information is added into the routing table.
Symptom 2: Try to import a static route to IPX RIP, but no static route is sent out.
Solutions:
Use the display ipx routing-table command to check whether the static route
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exists.
If the static route is not in the routing table, use the display ipx routing-table
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verbose command to check whether it exists as an inactive route. If the static
route exists, check the inactive reason. When the route becomes active, it can
be advertised as a RIP route.
If the configured static route is shown in the routing table, check whether its
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hop count is smaller than 15.