Hi,
It depends on the switch, it could be a spanning tree issue. See below from the following link
http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml
"If a port has a solid orange light, this means the software inside the switch shut down the port, either by way of the user interface or by internal processes.
Some port LEDs of the platform work differently in regard to STP. For example, the Catalyst 1900/2820 turns ports orange when they are in STP blocking mode. In this case, an orange light can indicate the normal functions of the STP. The Catalyst 6000/5000/4000 does not turn the port light orange when it blocks for STP."
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