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

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

11.2 Loop Guard

Use the Loop Guard screen to view Switch loop guard status. Click Monitor > Loop Guard to
access this screen.
GS1900 Series User's Guide
A
N
N
P
(Section 11.2 on page
B
P
P
A
69) displays loop guard status.
Chapter 11 Monitor: Loop Guard
69