Dell POWEREDGE M1000E - Manual (Page 73)

Switch Features 73
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.
Link Aggregation Features
For information about configuring link aggregation (port-channel) features,
see "Configuring Link Aggregation" on page 829.
Link Aggregation
Up to eight ports can combine to form a single Link Aggregated Group
(LAG). This enables fault tolerance protection from physical link disruption,
higher bandwidth connections and improved bandwidth granularity.
A LAG is composed of ports of the same speed, set to full-duplex operation.
Link Aggregate Control Protocol (LACP)
Link Aggregate Control Protocol (LACP) uses peer exchanges across links to
determine, on an ongoing basis, the aggregation capability of various links,
and continuously provides the maximum level of aggregation capability
achievable between a given pair of systems. LACP automatically determines,
configures, binds, and monitors the binding of ports to aggregators within the
system.