What You Can Do In This Chapter; Loop Guard - ZyXEL Communications GS1900 Series User Manual

Figure 102 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 103 Loop Guard – Network Loop

12.1.1 What You Can Do in this Chapter

The Loop Guard screen

12.2 Loop Guard

Use the Loop Guard screen to view Switch loop guard status. Click Monitor > Loop Guard to access this
screen.
Chapter 12 Monitor: Loop Guard
(Section 12.2 on page 96) displays loop guard status.
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