Users Guide

Interface BPDU Filtering
When you enable BPDU filtering on an interface, it stops sending and receiving BPDUs on the portfast-
enabled ports.
When you enable BPDU guard and BPDU filter on the port, the BPDU filter takes the highest precedence. By
default, BPDU filtering on an interface is disabled.
Figure 135. BPDU Filtering Enabled on an Interface
Selecting STP Root
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.
Spanning Tree Protocol (STP) 1062