Chapter 70 BPDU Guard
XGS2220 Series User’s Guide
474
C
HAPTER
70
BPDU Guard
70.1 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
) to have the ports become active after a certain time interval.
70.2 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 349
SECURITY > BPDU Guard > BPDU Guard Status
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