Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 986

www.dell.com | support.dell.com Adding an Interface to the Spanning Tree Group To add a Layer 2 interface to the Spanning Tree topology: Task Enable Spanning Tree on a Layer 2 interface. Command Syntax spanning-tree 0 Command Mode INTERFACE Removing an Interface from the Spanning Tree Group To remove a Layer 2 interface from the Spanning Tree topology: Task Disable Spanning Tree on a Layer 2 interface. Command Syntax no spanning-tree 0 Command Mode INTERFACE In FTOS versions prior to 7.6.1.0, the command no spanning tree disables Spanning Tree on the interface, however, BPDUs are still forwarded to the RPM, where they are dropped. Beginning in FTOS version 7.6.1.0, the command no spanning tree disables Spanning Tree on the interface, and incoming BPDUs are dropped at the line card instead of at the RPM, which frees processing resources. This behavior is called Layer 2 BPDU filtering and is available for STP, RSTP, PVST+, and MSTP. Modifying Global Parameters You can modify Spanning Tree parameters. The root bridge sets the values for forward-delay, hello-time, and max-age and overwrites the values set on other bridges participating in Spanning Tree. Note: Dell Force10 recommends that only experienced network administrators change the Spanning Tree parameters. Poorly planned modification of the Spanning Tree parameters can negatively impact network performance. Table 55-2, "STP Default Values," in Spanning Tree Protocol displays the default values for Spanning Tree. Table 55-2. STP Default Values STP Parameter Forward Delay Hello Time Max Age Default Value 15 seconds 2 seconds 20 seconds 986 | Spanning Tree Protocol