To view the current values for interface parameters, use the show spanning-tree rstp commandfrom EXEC privilege mode.Enabling SNMP Traps for Root Elections and TopologyChangesTo enable SNMP traps collectively, use this command.Enable SNMP traps for RSTP, MSTP, and PVST+ collectively.snmp-server enable traps xstpInfluencing RSTP Root SelectionRSTP determines the root bridge, but you can assign one bridge a lower priority to increase the likelihoodthat it is selected as the root bridge.To change the bridge priority, use the following command.• Assign a number as the bridge priority or designate it as the primary or secondary root.PROTOCOL SPANNING TREE RSTP modebridge-priority priority-value– priority-value The range is from 0 to 65535. The lower the number assigned, the more likelythis bridge becomes the root bridge.The default is 32768. Entries must be multiples of 4096.Example of the bridge-priority CommandA console message appears when a new root bridge has been assigned. The following example exampleshows the console message after the bridge-priority command is used to make R2 the root bridge(shown in bold).Dell(conf-rstp)#bridge-priority 409604:27:59: %RPM0-P:RP2 %SPANMGR-5-STP_ROOT_CHANGE: RSTP root changed. My BridgeID:4096:0001.e80b.88bd Old Root: 32768:0001.e801.cbb4 New Root: 4096:0001.e80b.88bdConfiguring an EdgePortThe EdgePort feature enables interfaces to begin forwarding traffic approximately 30 seconds sooner.In this mode an interface forwards frames by default until it receives a BPDU that indicates that it shouldbehave otherwise; it does not go through the Learning and Listening states. The bpduguard shutdown-on-violation option causes the interface hardware to be shut down when it receives a BPDU. Whenonly bpduguard is implemented, although the interface is placed in an Error Disabled state whenreceiving the BPDU, the physical interface remains up and spanning-tree drops packets in the hardwareafter a BPDU violation. BPDUs are dropped in the software after receiving the BPDU violation. This featureis the same as PortFast mode in Spanning Tree.CAUTION: Configure EdgePort only on links connecting to an end station. If you enable EdgePorton an interface connected to a network, it can cause loops.Dell Networking OS Behavior: Regarding bpduguard shutdown-on-violation behavior:• If the interface to be shut down is a port channel, all the member ports are disabled in the hardware.Rapid Spanning Tree Protocol (RSTP) 767
