XS1920 Series User’s Guide
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C
H A P T E R
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Loop Guard
27.1 Loop Guard Overview
This chapter shows you how to configure the Switch to guard against loops on the edge of your
network.
Loop guard allows you to configure the Switch to shut down a port if it detects that packets sent out
on that port loop back to the Switch. While you can use Spanning Tree Protocol (STP) to prevent
loops in the core of your network. STP cannot prevent loops that occur on the edge of your
network.
Figure 172
Loop Guard vs. STP
Refer to
for more information.
27.1.1 What You Can Do
Use the
Loop Guard
screen (
) to enable loop guard on the Switch and in
specific ports.
27.1.2 What You Need to Know
Loop guard is designed to handle loop problems on the edge of your network. This can occur when
a port is connected to a Switch that is in a loop state. Loop state occurs as a result of human error.
It happens when two ports on a switch are connected with the same cable. When a switch in loop
state sends out broadcast messages the messages loop back to the switch and are re-broadcast
again and again causing a broadcast storm.
If a switch (not in loop state) connects to a switch in loop state, then it will be affected by the
switch in loop state in the following way:
STP
Loop Guard
Summary of Contents for XS1920 Series
Page 18: ...18 PART I User s Guide ...
Page 32: ...32 PART II Technical Reference ...
Page 177: ...Chapter 21 Classifier XS1920 Series User s Guide 177 Figure 122 Classifier Example EXAMPLE ...
Page 408: ...Appendix C IPv6 XS1920 Series User s Guide 408 ...
Page 412: ...Appendix D Legal Information XS1920 Series User s Guide 412 Environmental Product Declaration ...
