ZyXEL Communications GS1510-16 -, Руководство пользователя

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GS1510 Series User’s Guide
81
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H A P T E R
14
Loop Guard
14.1 Overview
Use the Loop Guard screen ( Section 14.3 on page 83 ) 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 43 Loop Guard vs STP
14.2 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