Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module FTOS Command Line Referen - Page 382

www.dell.com | support.dell.com Command History Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module spanning-tree mstp Configures a Layer 2 MSTP interface as an edge port with (optionally) a BPDU guard, a BPDU filter or enables the root guard feature on the interface. Syntax spanning-tree mstp {edge-port [bpduguard [shutdown-on-violation | bpdufilter] | rootguard} Parameters edge-port bpduguard bpdufilter Enter the keyword edge-port to configure the interface as a Multiple Spanning Tree edge port. (OPTIONAL) Enter the keyword edgeport to enable edge port configuration 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 edgeport to enable edge port configuration to move the interface into forwarding mode immediately after the root fails. Enter the keyword bpdufilter to stop sending and receiving BPDUs on the port-fast enabled ports. shutdown-on-vi olation rootguard (OPTIONAL) Enter the keyword shutdown-on-violation to hardware disable an interface when a BPDU is received and the port is disabled. Enter the keyword rootguard to enable root guard on an MSTP port or port-channel interface. Command Modes INTERFACE Command History Version 8.3.16.1 Introduced on MXL 10/40GbE Switch IO Module 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. 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. When used in an MSTP network, if root guard blocks a boundary port in the CIST, the port is also blocked in all other MST instances. 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. 382 | Multiple Spanning Tree Protocol (MSTP)