Avaya ERS 2500, Troubleshooting Manual

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Chapter 5: General diagnostic tools
The Avaya Ethernet Routing Switch 2500 Series device has diagnostic features available through DM and
ACLI. You can use these diagnostic tools to help you troubleshoot operational and configuration issues.
You can configure and display files, view and monitor port statistics, trace a route, run loopback and ping
tests, test the switch fabric, and view the address resolution table.
This document focuses on using ACLI to perform the majority of troubleshooting.
The command line interface is accessed through either a direct console connection to the switch or by
using the Telnet or SSH protocols to connect to the switch remotely.
ACLI command modes
ACLI command modes provide different levels of authority for operation.
The ACLI has four major command modes, listed in order of increasing privileges:
• User EXEC
• Privileged EXEC
• Global configuration
• Interface configuration
Each mode provides a specific set of commands. The command set of a higher-privilege mode
is a superset of a lower-privilege mode. That is, all lower-privilege mode commands are
accessible when using a higher-privilege mode.
The command modes are as follows:
• User EXEC mode:
The User EXEC mode (also referred to as exec mode) is the default ACLI command
mode. User EXEC is the initial mode of access when the switch is first turned on and
provides a limited subset of ACLI commands. This mode is the most restrictive ACLI mode
and has few commands available.
• Privileged EXEC mode:
The Privileged EXEC mode (also referred to as privExec mode) enables you to perform
basic switch-level management tasks, such as downloading software images, setting
passwords, and booting the switch. PrivExec is an unrestricted mode that allows you to
view all settings on the switch, and if you are logged in with write access, you have access
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