Error Disable And Recovery Commands; Cpu Protection Overview - ZyXEL Communications Ethernet Switch Cli Reference Manual

C
HA P T E R
Error Disable and Recovery
Use these commands to configure the CPU protection and error disable recovery features on
the Switch.

19.1 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.
19.2 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.
19.3 User Input Values
This section lists the common term definition appears in this chapter.
Table 51 errdisable recovery command user input values
USER INPUT
port-list
Ethernet Switch CLI Reference Guide
DESCRIPTION
The port number or a range of port numbers that you want to configure.
19
Commands
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