332 BigIron RX Series Configuration Guide53-1002253-01IEEE 802.1D Spanning Tree Protocol (STP)12To prevent an end station from initiating or participating in STP topology changes, enter thefollowing command at the interface level of the CLI.BigIron RX(config) interface ethe 2/1BigIron RX(config-if-e1000-2/1)# spanning-tree protectThis command causes the port to drop STP BPDUs sent from the device on the other end of thelink.Syntax: [no] spanning-tree protectEnter the no form of the command to disable BPDU Guard on the port and remove thespanning-tree protect do-disable feature if they are configured.Enabling BPDU Guard and disabling a port that receives BPDUsYou can enable BPDU Guard on a port and at the same time configure a port to be disabled when itreceives a BPDU. Enter the following commands.BigIron RX(config) interface ethe 2/1BigIron RX(config-if-e1000-2/1)#spanning-tree protect do-disableSyntax: [no] spanning-tree protect do-disableIf both spanning-tree protect and spanning-tree protect do-disable are configured on an interface,spanning-tree protect do-disable takes precedence. This means that when the port receives aBPDU, the port will drop the BPDU and disable the port.If you issue a no spanning-tree protect do-disable command, the port will be re-enabled and will nolonger be disabled when it receives a BPDU. The following message is displayed when you enter theno spanning-tree protect do-disable command.This command removes only "spanning-tree protect do-disable". To remove"spanning-tree protect", please issue a separate command "no spanning-treeprotect".Displaying STP informationYou can display the following STP information:• All the global and interface STP settings• Detailed STP information for each interface• STP state information for a VLAN• STP state information for an individual interfaceDisplaying STP information for an entire deviceTo display STP information, enter the following command at any level of the CLI.
