22 FeaturesFILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Astute\UserGuide\Dell_Astute_Features.fmD E L L C O N F I D E N T I A L – P R E L I M I N A R Y 8 / 9 / 1 6 - F O R P R O O F O N L YIEEE 802.1w Rapid Spanning TreeSpanning Tree takes 30–60 seconds for each host to decide whether its portsare actively forwarding traffic. Rapid Spanning Tree (RSTP) detects uses ofnetwork topologies to enable faster convergence, without creating forwardingloops.For more information, see Rapid Spanning Tree.IEEE 802.1s Multiple Spanning TreeMultiple Spanning Tree (MSTP) operation maps VLANs into MSTPinstances. MSTP provides a different load balancing scenario. Packets from aVLAN are forwarded based on the MSTP instance to which the VLAN ismapped. An MSTP region is a group of MSTP bridges under a commonadministration. An MSTP region has one or more MSTP instances. A LANmay consists of one or more connecting MSTP regions.For more information, see MSTP Properties.STP BPDU GuardBridge Protocol Data Unit. (BPDU) Guard is used as a security mechanism,to protect the network from invalid configurations.BPDU Guard is usually used either when fast link ports (ports connected toclients) are enabled or when the STP feature is disabled. When it is enabledon a port, the port is shut down if a BPDU message is received and anappropriate SNMP trap is generated.For more information, see Spanning Tree Overview .Link AggregationUp to 12 Link Aggregation Groups (LAGs) may be defined, each with up toeight member ports. This enables:• Fault tolerance protection from physical link disruption• Higher bandwidth connections• Improved bandwidth granularity• High bandwidth server connectivityA LAG is composed of ports with the same speed, set to full-duplexoperation.
