OLT2406 User’s Guide
246
C
HAPTER
28
Loop Guard
28.1 Loop Guard Overview
This chapter shows you how to configure the OLT to guard against loops on the edge of your network.
Loop guard allows you to configure the OLT to shut down a port if it detects that packets sent out on
that port loop back to the OLT. 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 147
Loop Guard vs. STP
Refer to
for more information.
28.1.1 What You Can Do
Use the
Loop Guard
) to enable loop guard on the OLT and in specific
ports.
28.1.2 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 OLT 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:
• It will receive broadcast messages sent out from the switch in loop state.
• It will receive its own broadcast messages that it sends out as they loop back. It will then re-broadcast
those messages again.
Summary of Contents for OLT2406
Page 4: ...Document Conventions OLT2406 User s Guide 4 Desktop Laptop Switch IP Phone Smart T V...
Page 32: ...Table of Contents OLT2406 User s Guide 32 Index 758...
Page 33: ...33 PART I Introduction and Hardware Installation...
Page 63: ...63 PART II Web Configurator...
Page 179: ...Chapter 21 Classifier OLT2406 User s Guide 179 Figure 112 Classifier Example...
Page 182: ...Chapter 22 Policy Rule OLT2406 User s Guide 182 Figure 113 Advanced Application Policy Rule...
Page 186: ...Chapter 22 Policy Rule OLT2406 User s Guide 186 Figure 114 Policy Example...
Page 248: ...Chapter 28 Loop Guard OLT2406 User s Guide 248 Figure 151 Advanced Application Loop Guard...
Page 393: ...393 PART III CLI Commands...
Page 581: ...Chapter 78 VoIP OLT2406 User s Guide 581...
Page 725: ...725 PART IV Troubleshooting Specifications Appendices and Index...
