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Troubleshooting Checklist
4-6 Troubleshooting
Cannot contact
the 2E253-49R
through in-band
management.
IP address not assigned. Refer to SmartSwitch Series 2E253, 2H252,
2H253, and 2H258 Local Management
User’s Guide for the IP address assignment
procedure.
Port is disabled. Enable port. Refer to SmartSwitch Series
2E253, 2H252, 2H253, and 2H258 Local
Management User’s Guide for instructions
to enable/disable ports.
No link to device. 1.Verify that all network connections
between the network management station
and the 2E253-49R are valid and
operating.
2.If the problem continues, contact
Cabletron Systems for technical support.
Port(s) goes into
standby for no
apparent reason.
Loop condition detected. 1.Verify that Spanning Tree is enabled.
Refer to SmartSwitch Series 2E253,
2H252, 2H253, and 2H258 Local
Management User’s Guide for the
instructions to set the type of STA.
2.Review the network design and delete
unnecessary loops.
3.If the problem continues, contact
Cabletron Systems for technical support.
User parameters
(IP address,
Device and
Module name,
etc.) were lost
when the
2E253-49R
power was cycled
or the front panel
RESET button
was pressed.
1. Position of Mode switch
(7), NVRAM Reset, was
changed sometime before
either cycling power or
pressing the RESET
button, causing the
user-entered parameters to
reset to factory default
settings.
2. Clear NVRAM was set
through Local
Management.
1.Reenter the lost parameters as necessary.
Refer to SmartSwitch Series 2E253,
2H252, 2H253, and 2H258 Local
Management User’s Guide for the
instructions to configure the device
through Local Management.
2.If the problem continues, contact
Cabletron Systems for technical support.
Table 4-2 Troubleshooting Checklist (Continued)
Problem Possible Cause Recommended Action