ZyXEL Communications GS2200 Series, User Manual

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GS2200 Series User’s Guide
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H A P T E R
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Loop Guard
26.1 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 134
Loop Guard vs. STP
Refer to Section 26.1.2 on page 209 for more information.
26.1.1 What You Can Do
Use the Loop Guard screen ( Section 26.2 on page 211 ) to enable loop guard on the Switch and in
specific ports.
26.1.2 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