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Hallo Jürgen,

Ein "Restoring Factory Default" sollte Deine Probleme lösen.

Hier ein Ausschnitt aus dem Manual eines HP2626 (Baugleich)

Reset Button
This button is used to reset the switch while it is powered on. This action clears
any temporary error conditions that may have occurred and executes the
switch self test.

Clear Button
This button is used for these purposes:

• Deleting Passwords - When pressed by itself for at least one second, the

button deletes any switch console access passwords that you may have
configured. Use this feature if you have misplaced the password and need
console access.
This button is provided for your convenience, but its presence means
that if you are concerned with the security of the switch configuration
and operation, you should make sure the switch is installed in a secure
location, such as a locked wiring closet.

• Restoring Factory Default Configuration - When pressed with the

Reset button in a specific pattern, any configuration changes you may
have made through the switch console, the web browser interface, and
SNMP management are removed, and the factory default configuration is
restored to the switch. For the specific method to restore the factory
default configuration, see “Restoring the Factory Default Configuration”
on page 11, “Troubleshooting” of this manual.

Marco

-- edit : --

Restoring the Factory Default Configuration

As part of your troubleshooting process on the Switch, it may become necessary
to return the switch configuration to the factory default settings. This
clears any passwords, clears the console event log, resets the network
counters to zero, performs a complete self test, and reboots the switch into
its factory default configuration including deleting the IP address, if one is
configured.

This process removes all switch configuration changes that you have made
from the factory default settings. This includes, for example, configuration of
VLANs, Spanning Tree, trunks, and stacking. Returning the configuration of
these features to their factory default settings (usually disabling them) may
result in network connectivity issues.

If the switch has a valid configuration, and you are restoring the factory default
settings for a reason other than configuration problems, you should save the
switch configuration prior to performing the factory default reset. Then, after
the reset and resolution of the original problem, you can restore the saved
configuration to the switch. For both the save and restore processes, you can
use the console copy command. For more information on this command, see
the Management and Configuration Guide, which is on the Documentation
CD-ROM that came with your switch.

You can restore the factory default configuration either on the switch itself,
or through the switch console.
To execute the factory default reset on the switch, perform these steps:
1. Using pointed objects, simultaneously press both the Reset and Clear
buttons on the front of the switch. The power and fault lights come on.
2. Continue to press the Clear button while releasing the Reset button.
3. When the Self Test LED begins to blink, release the Clear button.
The switch will then complete its self test and begin operating with its
configuration restored to the factory default settings.
To restore the factory default configuration using the console, execute the
erase startup-config command from the console command prompt.