DELL N3000 User Manual

Switch Feature Overview

Spanning Tree BPDU Guard is used to disable the port in case a new device 

tries to enter the already existing topology of STP. Thus devices, which were 

originally not a part of STP, are not allowed to influence the STP topology.

When spanning tree is disabled on a port, the BPDU Filtering feature allows 

BPDU packets received on that port to be dropped. Additionally, the BPDU 

Filtering feature prevents a port in Port Fast mode from sending and receiving 

BPDUs. A port in Port Fast mode is automatically placed in the forwarding 

state when the link is up to increase convergence time.

Dell Networking switches support both Rapid Spanning Tree Per VLAN 

(RSTP-PV) and Spanning Tree Per VLAN (STP-PV). RSTP-PV is the IEEE 

802.1w (RSTP) standard implemented per VLAN. A single instance of rapid 

spanning tree (RSTP) runs on each configured VLAN. Each RSTP instance 

on a VLAN has a root switch. STP-PV is the IEEE 802.1s (STP) standard 

implemented per VLAN.