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Chapter 71 BPDU Guard
XGS2220 Series User’s Guide
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CHAPTER 71
BPDU Guard
71.1 BPDU Guard Overview
A BPDU (Bridge Protocol Data Units) is a data frame that contains information about STP. STP-aware
switches exchange BPDUs periodically.
The BPDU guard feature allows you to prevent any new STP-aware switch from connecting to an existing
network and causing STP topology changes in the network. If there is any BPDU detected on the ports
on which BPDU guard is enabled, the Switch disables the ports automatically. You can then enable the
ports manually in the PORT > Port Setup screen, or use the SECURITY > Errdisable > Errdisable Recovery
screen (see Section 73.5 on page 544) to have the ports become active after a certain time interval.
71.2 BPDU Guard Status
Use this screen to view whether BPDU guard is enabled on the Switch and the port status. Click SECURITY
> BPDU Guard > BPDU Guard Status to view the following screen.
Figure 420 SECURITY > BPDU Guard > BPDU Guard Status (Standalone Mode)
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