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Chapter 11 Monitor: Loop Guard
GS1900 Series User’s Guide
69
Figure 50 Loop Guard - Probe Packet
The Switch also shuts down port N if the probe packet returns to switch A on any other port. In
other words loop guard also protects against standard network loops. The following figure
illustrates three switches forming a loop. A sample path of the loop guard probe packet is also
shown. In this example, the probe packet is sent from port N and returns on another port. As long
as loop guard is enabled on port N. The Switch will shut down port N if it detects that the probe
packet has returned to the Switch.
Figure 51 Loop Guard - Network Loop
11.1.1 What You Can Do in this Chapter
•The Loop Guard screen (Section 11.2 on page 69) displays loop guard status.
11.2 Loop Guard
Use the Loop Guard screen to view Switch loop guard status. Click Monitor > Loop Guard to
access this screen.
A
B
P
P
N
A
P
P
N
P