Bridge Protocol Data Unit (Bpdu) Guard; Bpdu Filtering; Rstp-Pv And Stp-Pv - Dell Networking N4000 Series Configuration Manual

Bridge Protocol Data Unit (BPDU) Guard

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.

BPDU Filtering

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.

RSTP-PV and STP-PV

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.
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Switch Feature Overview