Zyxel GS1900-48HP [72/230] What you can do in this chapter

Chapter 11 Monitor: Loop Guard

GS1900 Series User’s Guide

Figure 64 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 65 Loop Guard - Network Loop

11.1.1 What You Can Do in this Chapter

•The Loop Guard screen (Section 11.2 on page 72) 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.