Question on STP when connecting 2960 with Alpine

Hi All,
I am trying to connect 2960 switches to the extreme Alpine switches.
As per the diagram below,STP is not running in the alpines.I am not very sure whether STP should be enabled in this scenario to avoid any loops.
All suggestions are appreciated.
Note:
Both Alpines are connected as trunk links.
Both 2960's are connected using Fasethernet ports as Trunk using port-channel
Then each Alpine to 2960's using the Gig interface.
Thanks
[Trunk]
Alpine---------------Alpine
| |
| [Trunk] |
2960---------------- 2960

Hi
The picture isn't terribly clear but your verbal description says that the two Alpines are connected to each other, and the two 2960s are connected to each other. Also that each Alpine is connected to a 2960.
I guess that the diagram should look like a square?
A square is just a loop with corners, so you definately want STP enabled - there are not many situations where it's recommended to disable it.
Make sure you have portfast turned on (or it's equivalent on the Aplines) on user ports and there should be no negative effects of turning it on.
Regards
Aaron
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DVD Receivers:
• With the unit turned off (press the home button and select ‘OFF’ from the source icons), press the home button → Press the “System” icon at the bottom of the screen → Select the “Bluetooth Version Info” option → The firmware version should show HW05-SW01.27.20.
If the Bluetooth firmware version shows HW05-SW01.27.20, no further action is necessary.
Questions
If you have any questions, please contact the Pioneer Customer Service Center toll free at 1-800-421-1404, Monday through Friday, 10:00 a.m. to 7:30 p.m. (Eastern Time), except on holidays.
Sincerely,
Pioneer Electronics (USA) Inc.

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