ZyXEL Communications XS3800-28, User Manual, Page: 589 / 789

Chapter 79 BPDU Guard
XS3800-28 User’s Guide
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HAPTER
79
BPDU Guard
79.1 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 81.5 on page 602 ) to have the ports become active after a certain time interval.
79.1.1 What You Can Do
• Use the BPDU Guard Status screen ( Section 79.2 on page 589 ) to view the BPDU guard status.
• Use the BPDU Guard Setup screen ( Section 79.3 on page 590 ) to enable BPDU guard on the Switch.
79.2 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 464 SECURITY > BPDU Guard > BPDU Guard Status (Standalone Mode)