ZyXEL Communications GS1900-8HP - What You Can Do in this Chapter; Loop Guard

Chapter 12 Monitor: Loop Guard
GS1900 Series User’s Guide
88
Fig ure 88 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.
Fig ure 89 Loop Guard - Network Loop
12.1.1 Wha t Yo u C a n Do in this C ha pte r
The Lo o p G ua rd screen (
Section 12.2 on page 88) displays loop guard status.
12.2 Lo o p G ua rd
Use the Lo o p G ua rd screen to view Switch loop guard status. Click Mo nitor > Lo o p G ua rd to access this
screen.