Users Guide
Figure 113. Enabling BPDU Guard
Dell Networking OS Behavior: BPDU guard and BPDU ltering both block BPDUs, but are two separate features.
BPDU guard:
• is used on edgeports and blocks all trac on edgeport if it receives a BPDU.
• drops the BPDU after it reaches the RP and generates a console message.
BPDU ltering:
• disables spanning tree on an interface
• drops all BPDUs at the line card without generating a console message
Example of Blocked BPDUs
Selecting STP Root
The STP determines the root bridge, but you can assign one bridge a lower priority to increase the likelihood that it becomes the root
bridge. You can also specify that a bridge is the root or the secondary root.
To change the bridge priority or specify that a bridge is the root or secondary root, use the following command.
• Assign a number as the bridge priority or designate it as the root or secondary root.
PROTOCOL SPANNING TREE mode
bridge-priority {priority-value | primary | secondary}
• priority-value: the range is from 0 to 65535. The lower the number assigned, the more likely this bridge becomes the root
bridge.
The primary option species a bridge priority of 8192.
842
Spanning Tree Protocol (STP)