Solving Communication Problems - 3Com 4200G Getting Started Manual

60 C 4: P
HAPTER ROBLEM
Solving
Communication
Problems
S
OLVING
If a fan failure warning message is generated:
1 Power off the unit.
2 Check that the air vents are not obstructed.
3 Power cycle the unit. To do this, remove and reconnect the AC mains
supply. If another fan failure warning message is generated using the
Command Line Interface or the Web interface, return the unit to 3Com.
Unit fails, no SNMP fan failure message is received
1 Power cycle the unit. To do this, remove and reconnect the AC mains
supply.
2 Check the command line interface (display logbuffer command)
to determine whether a thermal shutdown has occurred. If not, return
the unit. If it has occurred, check that:
The air vents are not obstructed.
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The ambient temperatures and environmental conditions meet those
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specified in Appendix .
3 Power cycle the unit. If a further thermal shutdown occurs, and all
environmental conditions are satisfactory, return the unit to 3Com.
Error message indicating that the SFP transceiver is invalid
The switch has identified that the SFP does not meet the minimum
requirements for the switch and has disabled the port. To correct this
problem, completely remove the SFP and replace it with a 3Com
approved SFP. See "Approved SFP Transceivers" on page 26.
Error message indicating that the SFP transceiver is faulty
To correct this problem, completely remove the SFP and then reinsert it.
Alternatively, insert another identical SFP. If the problem persists, contact
3Com Technical Support.
If you experience communication problems with the switch, ensure that:
The switch's IP address and Management VLAN ID is configured.
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If the switch is separated from your management application by a
■
router, ensure that the default gateway IP address within the switch is
the same as the IP address of the router.