ZyXEL Communications GS1900 Series, Руководство пользователя

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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 nito r
>
Lo o p G ua rd
to access this
screen.