Dell Force10 S4820T FTOS Command Reference Guide - Page 1315
example, when Portfast BPDU guard and loop guard are both con d
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Usage Information Version 7.6.1.0 Version 7.5.1.0 Version 7.4.1.0 Version 6.2.1.1 Support added for S-Series Support added for C-Series Added the optional Bridge Port Data Unit (BPDU) guard. Introduced for 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 mis-configured, 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, will immediately transition to the forwarding state. Only ports connected to end-hosts should be configured as edge ports. Consider an edge port similar to a port with a spanning-tree portfast enabled. Example If shutdown-on-violation is not enabled, BPDUs will still be sent to the RPM CPU. STP root guard and loop guard cannot be enabled 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 is displayed: % 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. FTOS(conf)#interface gigabitethernet 4/0 FTOS(conf-if-gi-4/0)#spanning-tree rstp edge-port FTOS(conf-if-gi-4/0)#show config ! interface GigabitEthernet 4/0 no ip address switchport spanning-tree rstp edge-port no shutdown FTOS# tc-flush-standard c e s Enable the MAC address flushing upon receiving every topology change notification. Rapid Spanning Tree Protocol (RSTP) | 1315