Per-VLAN Spanning Tree Plus As discussed in Chapter 5, 802.1Q has defined standards-based technologies for handling VLANs. To reduce the complexity of this standard, the 802.1 committee specified only a single instance of Spanning Tree for all VLANs. Not only does this provide a considerably less flexible approach than the Per-VLAN Spanning Tree (PVST) adopted by Cisco, it … [Read more...]