Reference Guide

Spanning Tree Protocol (STP) | 899
Figure 50-8. Enabling BPDU Guard
BPDU Filtering
Global BPDU Filtering
When BPDU Filtering is enabled globally, it should stop transmitting BPDUs on the operational port fast
enabled ports by default. When it receives BPDUs, it automatically participates in the spanning tree. By
default global BPDU filtering is disabled.
Dell Networking OS Behavior: BPDU Guard and BPDU filtering (refer to Removing an Interface from the
Spanning Tree Group) both block BPDUs, but are two separate features.
Dell 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 stack unit and generates a console message
BPDU Filtering:
• disables Spanning Tree on an interface
• drops all BPDUs at the stack unit without generating a console message
Hub
S
witch with Spanning Tree Enabled
Force10(conf-if-gi-3/41)# spanning-tree 0 portfast bpduguard shutdown-on-violation
Force10(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