User manual

Chapter 36 BPDU Guard
GS2210 Series User’s Guide
316
CHAPTER 36
BPDU Guard
36.1 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 port(s)
on which BPDU guard is enabled, the Switch disables the port(s) automatically. You can then enable the
port(s) manually in the Basic Setting > Port Setup screen (Section 8.7 on page 74) or use the Errdisable
Recovery screen (see Section 31.6 on page 281) to have the port(s) become active after a certain time
interval.
36.1.1 What You Can Do
• Use the BPDU Guard Status screen (Section 36.2 on page 316) to view the BPDU guard status.
• Use the BPDU Guard Configuration screen (Section 36.3 on page 317) to enable BPDU guard on the
Switch.
36.2 BPDU Guard Status
Use this screen to view whether BPDU guard is enabled on the Switch and the port status. Click
Advanced Application > BPDU Guard in the navigation panel.