3Com Switch 7757, Configuration Manual

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150 C
HAPTER
17: IPX C
ONFIGURATION
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Check whether there are update packets with the debugging ipx packet and
debugging ipx sap packet verbose commands. All the received/transmitted
packets can be displayed through debugging information. If there are no
update packets, check whether the underlying network connection is available.
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Use the display ipx interface command to check whether SAP is enabled.
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Check whether the hop count of the active route to the server is smaller than
16.
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Use the display current-configuration command to check whether the update
interval is too long.
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Use the display current-configuration command to check whether the
triggered updates feature is configured on the VLAN interface. Periodical
update is disabled when the triggered updates feature applies.
Symptom 5: No update packets are sent out of the VLAN interface.
Solutions:
■
Check whether there are update packets with the debugging ipx packet and
debugging ipx sap packet verbose commands. Check whether the MTU of the
SAP packets is smaller than the MTU of the VLAN interface to guarantee that
they are not dropped by the underlying layer.
■
Use the display current-configuration command to check whether the
triggered updates feature is configured on the VLAN interface. Periodical
update is disabled when the triggered updates feature applies.
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Check whether all service information is learnt from the VLAN interface. Then
check whether split horizon is enabled on the VLAN interface.
Symptom 6: SAP does not respond to GNS requests.
Solutions:
■
Use the debugging ipx packet sap command to check whether the switch
receives the GNS packets.
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Check whether SAP is enabled on the VLAN interface.
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Use the display ipx interface command to check whether the VLAN interface is
enabled to respond to GNS requests. If GNS reply is disabled, use the undo ipx
sap gns-disable-reply command to enable the interface to respond to the GNS
requests.
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Use the display ipx service table command to check whether the requested
service information is available in the service information table.
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If the requested service information is available in the service information table,
but SAP still does not give response, you need to check whether the service
information is learnt from the interface where the request is received.
Symptom 7: SAP does not respond to a GNS request through Round-Robin.
Solutions:
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Use the display current-configuration command to check whether
Round-Robin is enabled.