Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 991
STP Root Selection, Enabling BPDU Guard, FTOS Behavior, Command Syntax, Command Mode
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Figure 55-3. Enabling BPDU Guard FTOS(conf-if-gi-3/41)# spanning-tree 0 portfast bpduguard shutdown-on-violation FTOS(conf-if-gi-3/41)#show config ! interface GigabitEthernet 3/41 no ip address switchport spanning-tree 0 portfast bpduguard shutdown-on-violation no shutdown 3/41 Hub Switch with Spanning Tree Enabled To verify the Portfast BPDU loop guard configuration on a port or port-channel interface, enter the show spanning-tree 0 guard [interface interface] command in global configuration mode. FTOS Behavior: BPDU Guard and BPDU filtering (refer to Removing an Interface from the Spanning Tree Group) both block BPDUs, but are two separate features. BPDU Guard: • is used on edgeports and blocks all traffic on edgeport if it receives a BPDU • drops the BPDU after it reaches the RPM and generates a console message BPDU Filtering: • disables Spanning Tree on an interface • drops all BPDUs at the line card without generating a console message STP Root Selection Although the Spanning Tree Protocol determines the root bridge, you can assign a lower priority to one bridge to increase the likelihood that it will be selected as the root bridge. You can also configure a bridge to be the root or secondary root. To change the bridge priority or specify that a bridge is the root or secondary root: Task Command Syntax Assign a number as the bridge priority or designate it as the root or secondary root. priority-value range: 0 to 65535. The lower the number assigned, the more likely this bridge will become the root bridge. The default is 32768. • The primary option specifies a bridge priority of 8192. • The secondary option specifies a bridge priority of 16384. bridge-priority {priority-value | primary | secondary} Command Mode PROTOCOL SPANNING TREE Spanning Tree Protocol | 991
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