STP and potential loops - 2 switches

Answered Question
Aug 14th, 2008
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Hi guys, I have 2 switches, both WS2960. I have a single trunk between them and STP is only running on the native VLAN.


By only having a single trunk, am I still creating a possibility of looping back over the same trunk? Should I create a second trunk to avoid loops over a simple two switch network?


Thanks,


Dean

Hi Dean


With a single trunk link between two switches there is no loop issue. This is a point to point link. So unless someone connects a second cable between the switches, there you will not have looping issues.


However if and when you add a second link between the switches, this is when you have created a loop and require STP.


AFAIK STP is active for all VLAN's automatically by default on Cisco switches.



Best Regards,


Michael

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Correct Answer

Hi Dean


With a single trunk link between two switches there is no loop issue. This is a point to point link. So unless someone connects a second cable between the switches, there you will not have looping issues.


However if and when you add a second link between the switches, this is when you have created a loop and require STP.


AFAIK STP is active for all VLAN's automatically by default on Cisco switches.



Best Regards,


Michael

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