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Beginner

how to prevent loops? (STP)

hi, im using packet tracer,

i have 3 switches that are linked together in the shape of a triangle, i have just setup vlan trunking but in doing so the orange blocked port that prevents looping has turned green.

How do i reblock the port without shuting it down to prevent loops?

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Cisco Employee

What type of switches are you using ?

You just need to make sure spanning-tree is properly enabled on each of them. Also, when you refer to the "orange" port, do you mean the color of the led for that particular port ?

What happens if you check spanning-tree state on the different switches (show spanning-tree vlan ) ?

Are you using any specific features on the ports used in the "triangle" like portfast ? Can you share the switches configuration and how they are interconnected ?

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