ZyXEL Communications GS1900 11.2 Loop Guard, Loop Guard, Loop Guard, Monitor > Loop Guard

Chapter 11 Monitor: Loop Guard

Figure 50 Loop Guard - Probe Packet

AB

P

N P

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

P	N
	P

A

P

11.1.1What 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.

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GS1900 Series User’s Guide