Cisco switches run different types of STP protocol, depending on whether the connected port is access, ISL trunk or 802.1q trunk. Natively, Cisco switch runs a separate STP instance for each configured and active VLAN (this is called Per-VLAN Spanning Tree or PVST) and standard IEEE compliant switches run just one instance of STP shared by all VLANs. Due to that reason, a group of switches running IEEE compatible STP protocol is called MST (Mono Spanning Tree) region, not to be confused with... Read More

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