Dell PowerConnect 6224P User's Guide - Page 28
Spanning Tree Protocol Features, Loop Guard, TCN Guard, Auto Edge, BPDU Filter, BPDU Flood
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Spanning Tree Protocol Features Spanning Tree Now Supports IEEE 802.1Q-2005 This version of the IEEE Multiple Spanning Tree Protocol corrects problems associated with the previous version, provides for faster transition-to-forwarding, and incorporates new features for a port (restricted role and restricted TCN). Spanning Tree Enhancements • Loop Guard - This feature prevents a port from erroneously transitioning from blocking state to forwarding when the port stops receiving BPDUs. The port is marked as being in loop-inconsistent state. In this state, the port does not forward packets. The possible values are Enable or Disable. • TCN Guard - Enabling the TCN Guard feature restricts the port from propagating any topology change information received through that port. This means that even if a port receives a BPDU with the topology change flag set to true, the port will not flush its MAC address table and send out a BPDU with a topology change flag set to true. • Auto Edge - Enabling the Auto Edge feature allows the port to become an edge port if it does not see BPDUs for some duration. • BPDU Filter - When enabled, this feature filters the BPDU traffic on this port when STP is enabled on this port. • BPDU Flood - When enabled, the BPDU Flood feature floods the BPDU traffic arriving on this port when STP is disabled on this port. Spanning Tree Protocol (STP) per Switch 802.1d STP is a standard requirement of Layer 2 switches that allows bridges to automatically prevent and resolve L2 forwarding loops. For information about configuring Spanning Tree Protocol, see "Configuring the Spanning Tree Protocol." IEEE 802.1w Rapid Spanning Tree Rapid Spanning Tree Protocol (RSTP) detects and uses network topologies to enable faster spanning tree convergence after a topology change, without creating forwarding loops. For information about configuring Rapid Spanning Tree Protocol, see "Rapid Spanning Tree." Multiple Spanning Tree Multiple Spanning Tree (MSTP) operation maps VLANs to spanning tree instances. Packets assigned to various VLANs are transmitted along different paths within MSTP Regions (MST Regions). Regions are one or more interconnected MSTP bridges with identical MSTP settings. The MSTP standard lets administrators assign VLAN traffic to unique paths. For information about configuring Multiple Spanning Tree, see "MSTP Settings." 28 Introduction