Administrator Guide

Figure 140. Enabling BPDU Guard
Dell EMC Networking OS Behavior
BPDU guard:
● is used on edgeports and blocks all traffic on edgeport if it receives a BPDU.
● drops the BPDU after it reaches the RP and generates 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 specifies a bridge priority of 8192.
The secondary option specifies a bridge priority of 16384.
The default is 32768.
To view only the root information, use the show spanning-tree root command from EXEC privilege mode.
Dell#show spanning-tree 0 root
Root ID Priority 32768, Address 0001.e80d.2462
We are the root of the spanning tree
958
Spanning Tree Protocol (STP)