I'm about to hook up a stonegate firewall up to a 3550 switch. I want to hook up redundant links (2 links, same subnet). Will spanning tree block one of the ports even if it the links go to a 3rd party device? Or is STP used only between Cisco devices?
Nawlej's answer is partially right. Spanning Tree is compatible with other devices if you are using common spanning tree 802.1d If you start to implement Per-Vlan spanning tree then it is Cisco proprietary. I think my explanation will help you figure out which version is right for you.
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