80 Switch Feature Overview
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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