Инструкция для ZYXEL GS3700-48

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GS3700/XGS3700 Series User’s Guide

257

C

H A P T E R

      3 0

Error Disable

This chapter shows you how to configure the rate limit for control packets on a port, and set the 
Switch to take an action (such as to shut down a port or stop sending packets) on a port when the 
Switch detects a pre-configured error. It also shows you how to configure the Switch to 
automatically undo the action after the error is gone.

30.1  CPU Protection Overview

Switches exchange protocol control packets in a network to get the latest networking information. 
If a switch receives large numbers of control packets, such as ARP, BPDU or IGMP packets, which 
are to be processed by the CPU, the CPU may become overloaded and be unable to handle regular 
tasks properly. 

The CPU protection feature allows you to limit the rate of ARP, BPDU and IGMP packets to be 
delivered to the CPU on a port. This enhances the CPU efficiency and protects against potential DoS 
attacks or errors from other network(s). You then can choose to drop control packets that exceed 
the specified rate limit or disable a port on which the packets are received.

30.2  Error-Disable Recovery Overview

Some features, such as loop guard or CPU protection, allow the Switch to shut down a port or 
discard specific packets on a port when an error is detected on the port. For example, if the Switch 
detects that packets sent out the port(s) loop back to the Switch, the Switch can shut down the 
port(s) automatically. After that, you need to enable the port(s) or allow the packets on a port 
manually via the web configurator or the commands. With error-disable recovery, you can set the 
disabled port(s) to become active or start receiving the packets again after the time interval you 
specify.

30.3  The Error Disable Screen

Use this screen to configure error disable related settings. Click Advanced Application > 
Errdisable
 in the navigation panel to open the following screen.

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