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New Member

Spanning-tree in looping

Hi,

I have one layer 3 switch with 3 gigabit port connecting two sites with fibre. For redundance I have one catalyst connected in G1/1 with directed link laser for other catalyst in site B. But, when up the interface in catalyst the spanning-tree enter in looping. My question is: What is the bether configuration of spanning-tree to prevent this looping? I have that to change some thing in layer-3?

Thanks for help!

1 REPLY
New Member

Re: Spanning-tree in looping

You may want to check if portfast in enabled on any of these interfaces. If it is, you'll probably want to turn it off.

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