HP PROCURVE 6120 Management And Configuration Manual page 460

Troubleshooting
Troubleshooting Approaches
C-6
For the downlink and ISL ports, troubleshooting can be done from the OA
■
Web interface. These ports are controlled from both the OA and the switch
configuration. A port state is a combination of OA Enable/Disable state
and the switch Enable/Disable state. The port is not Enabled until both
the OA and the switch agree that it is Enabled.