Chapter 27 Loop Guard
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returns to port N on A. The Switch then shuts down port N to ensure that the rest
of the network is not affected by the switch in loop state.
Figure 118 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 119 Loop Guard - Network Loop
Note: After resolving the loop problem on your network you can re-activate the
disabled port via the web configurator (see Section 8.8 on page 81) or via
commands (See the CLI Reference Guide).
27.4 Loop Guard Setup
Click Advanced Application > Loop Guard in the navigation panel to display
the screen as shown.
A
B
P
P
N
A
P
P
N
P
