Dell Force10 S55T FTOS Command Line Reference Guide for the S55 System FTOS 8. - Page 905

Parameters cost Port cost edge-port bpduguard shutdown-on-v iolation priority priority (OPTIONAL) Enter the keyword cost followed by the port cost value. Range: 1 to 200000 Defaults: 100 Mb/s Ethernet interface = 200000 1-Gigabit Ethernet interface = 20000 10-Gigabit Ethernet interface = 2000 Port Channel interface with one 100 Mb/s Ethernet = 200000 Port Channel interface with one 1-Gigabit Ethernet = 20000 Port Channel interface with one 10-Gigabit Ethernet = 2000 Port Channel with two 1-Gigabit Ethernet = 18000 Port Channel with two 10-Gigabit Ethernet = 1800 Port Channel with two 100-Mbps Ethernet = 180000 Enter the keyword edge-port to configure the interface as a Rapid Spanning Tree edge port. (OPTIONAL) Enter the keyword portfast to enable Portfast to move the interface into forwarding mode immediately after the root fails. Enter the keyword bpduguard to disable the port when it receives a BPDU. (OPTIONAL) Enter the keyword shutdown-on-violation to hardware disable an interface when a BPDU is received and the port is disabled. (OPTIONAL) Enter keyword priority followed by a value in increments of 16 as the priority. Range: 0 to 240. Default: 128 Defaults Not configured Command Modes INTERFACE Command History Version 8.3.5.0 Version 8.2.1.0 Version 7.6.1.0 Version 7.5.1.0 Version 7.4.1.0 Version 6.2.1.1 Introduced on S55 Introduced hardware shutdown-on-violation options Support added for S-Series Support added for C-Series Added the optional Bridge Port Data Unit (BPDU) guard. Introduced for E-Series Usage Information 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, 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. If shutdown-on-violation is not enabled, BPDUs will still be sent to the RPM CPU. Rapid Spanning Tree Protocol (RSTP) | 905