Dell Force10 S55T FTOS Command Line Reference Guide for the S55 System FTOS 8. - Page 677

Parameters mstp edge-port bpduguard shutdown-on-v iolation Enter the keywords mstp followed by the keyword edge-port to configure the interface as a Multiple 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. 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 6.1.1.0 Introduced on the S55. Introduced hardware shutdown-on-violation option Added support for S-Series Added support for C-Series Support for BPDU guard added Usage Information On an MSTP switch, a port configured as an edge port will immediately transition to the forwarding state. Only ports connected to end-hosts should be configured as an edge port. Consider an edge port similar to a port with spanning-tree portfast enabled. If shutdown-on-violation is not enabled, BPDUs will still be sent to the RPM CPU. tc-flush-standard c e s Enable the MAC address flushing upon receiving every topology change notification. Syntax tc-flush-standard To disable, use the no tc-flush-standard command. Defaults Disabled Command Modes CONFIGURATION Command History Version 8.3.5.0 Version 7.6.1.0 Version 7.5.1.0 Version 6.5.1.0 Introduced on the S55. Added support for S-Series Added support for C-Series Introduced Usage Information By default FTOS implements an optimized flush mechanism for MSTP. This helps in flushing the MAC addresses only when necessary (and less often) allowing for faster convergence during topology changes. However, if a standards-based flush mechanism is needed, this knob command can be turned on to enable flushing MAC addresses upon receiving every topology change notification. Multiple Spanning Tree Protocol (MSTP) | 677