Dell C9010 Modular Chassis Switch EMC Networking Command-Line Reference Guide - Page 1465
Usage, Information, Example, Syntax, Defaults, Command Modes, Command, History
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Usage Information Example Version 6.2.1.1 Description Introduced on the E-Series. The BPDU guard option prevents the port from participating in an active STP topology in case a BPDU appears on a port unintentionally, or is misconfigured, or is subject to a DOS attack. This option places the port into an Error Disable state if a BPDU appears and a message is logged so that the administrator can take corrective action. NOTE: A port configured as an edge port, on an RSTP switch, immediately transitions to the Forwarding state. Only configure ports connected to end-hosts as edge ports. Consider an edge port similar to a port with a spanning-tree portfast enabled. If you do not enable shutdown-on-violation, BPDUs are still sent to the RPM CPU. You cannot enable STP root guard and loop guard at the same time on a port. For example, if you configure loop guard on a port on which root guard is already configured, the following error message displays: % Error: RootGuard is configured. Cannot configure LoopGuard. Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a Blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and loop guard are both configured: ● If a BPDU is received from a remote device, BPDU guard places the port in an Err-Disabled Blocking state and no traffic is forwarded on the port. ● If no BPDU is received from a remote device, loop guard places the port in a Loop-Inconsistent Blocking state and no traffic is forwarded on the port. On the port extender (PE) ports and on VP-LAGs (LAGs created with PE): ● Spanning-tree with BPDU guard shutdown-on-violation is enabled as a default setting. ● No spanning tree command is valid. This command is not visible and issuing this command on VP-LAG ports results in a failure. Dell(conf)#interface tengigabitethernet 2/0 Dell(conf-if-te-2/0)#spanning-tree rstp edge-port Dell(conf-if-te-2/0)#show config ! interface TenGigabitEthernet 2/0 no ip address switchport spanning-tree rstp edge-port no shutdown Dell# tc-flush-standard Enable the MAC address flushing after receiving every topology change notification. C9000 Series Syntax tc-flush-standard To disable, use the no tc-flush-standard command. Defaults Disabled Command Modes CONFIGURATION (conf-rstp) Command History This guide is platform-specific. For command information about other platforms, refer to the relevant Dell Networking OS Command Line Reference Guide. The following is a list of the Dell Networking OS version history for this command. Rapid Spanning Tree Protocol (RSTP) 1465
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