ZyXEL Communications ONU-2024 Series, User Manual

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ONU User’s Guide
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H A P T E R
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Loop Guard
22.1 Overview
This chapter shows you how to configure the ONU to guard against loops on the edge of your
network.
Loop guard allows you to configure the ONU to shut down a port if it detects that packets sent
out on that port loop back to the ONU. 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 87 Loop Guard vs. STP
22.1.1 What You Can Do in the Loop Guard Screen
The Loop Guard screen enables the ONU’s loop guard feature, as well as configure the loop
guard feature on an individual port-by-port basis ( Section 22.2 on page 172 ).
STP
Loop Guard