Airport Extreme dropping connection with a Cisco 5 port Giga switch

I've connected a Cisco 5 port Giga switch SG100D-05 to one of the LAN ports of the Airport Extreme and for some reason the connection is being dropped or it fails to connect. Any idea of why this is happening and how can it be fixed?

If you have not already done so, you might want to do some basic troubleshooting to try to isolate the cause of the issue.
To do that, temporarily disconnect the switch and power it off. Connect a computer with an Ethernet port on it to the LAN port on AirPort Extreme and turn off the wireless on the computer.
Test to see you can get a good Internet connection this way.
If you can, then you know that the LAN port on the AirPort Extreme is functioning correctly and your troubleshooting efforts will need to focus on testing each port on the Cisco switch.
If you cannot get a good connection with the computer connected directly to the AirPort Extreme, try another Ethernet cable that you know is working to eliminate the possibility of a bad Ethernet cable, which is the culprit more often than you might think.
Please post back on the results of your testing.

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