Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module FTOS Command Line Referen - Page 629

Table 34-2. show spanning-tree 0 guard Command Description Field Guard Type Bpdu Filter Description Type of STP guard configured (Root, Loop, or BPDU guard) BPDU Filter enabled - Yes, BPDU Filter disabled - No spanning-tree 0 Assigns a Layer 2 interface to STP instance 0 and configures a port cost or port priority, or enables loop guard, root guard, or the Portfast feature on the interface. Syntax spanning-tree stp-id {cost cost | {rootguard} | portfast [bpduguard [shutdown-on-violation] | bpdufilter] | priority priority} To disable the spanning tree group on an interface, use the no spanning-tree stp-id {cost cost | {rootguard} | portfast [bpduguard [shutdown-on-violation] | bpdufilter] | priority priority} command. Parameters stp-id cost cost rootguard portfast [bpduguard [shutdown-on-violat ion] | bpdufilter] priority priority Enter the STP instance ID. Range: 0 Enter the keyword cost followed by a number as the cost. Range: 1 to 65535 Defaults: • 40-Gigabit Ethernet interface = 1 • 10-Gigabit Ethernet interface = 2 • Port Channel interface with 40-Gigabit Ethernet = 1 • Port Channel interface with 10-Gigabit Ethernet = 1 Enter the keyword rootguard to enable STP root guard on a port or port-channel interface. Enter the keyword portfast to enable Portfast to move the interface into forwarding mode immediately after the root fails. Enter the optional keyword bpduguard to disable the port when it receives a BPDU. Enter the optional keyword shutdown-on-violation to hardware disable an interface when a BPDU is received and the port is disabled. Enter the keyword bpdufilter to enable on an interface; it should stop sending and receiving BPDUs on the port fast enabled ports. Enter keyword priority followed by a number as the priority. Range: zero (0) to 15 Default: 8 Defaults cost = depends on the interface type; priority = 8 Command Modes INTERFACE Command History Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module Usage Information If you enable portfast bpduguard on an interface and the interface receives a BPDU, the software disables the interface and sends a message stating that fact. The port is in ERR_DISABLE mode, yet appears in the show interface commands as enabled. If you do not enable the shutdown-on-violation command, BPDUs are still sent to the CPU. Spanning Tree Protocol (STP) | 629