# About this Documentation Set

This section describes the conventions used in this documentation set and information on how to contact customer support.

## Conventions Used

The following tables describe the conventions used throughout this documentation.

Icon | Notice Type | Description
--- | --- | ---
| Information Note | Provides information about important features or instructions.
| Caution | Alerts you of potential damage to a program, device, or system.
| Warning | Alerts you of potential personal injury or fatality. May also alert you of potential electrical hazards.
| Electro-Static Discharge (ESD) | Warns you to take proper grounding precautions before handling ESD sensitive components or devices.

Typeface Conventions | Description
--- | ---
Text represented as a `screen display` | This typeface represents displays that appear on your terminal screen, for example: `Login:`
Text represented as commands | This typeface represents commands that you enter, for example: show ip access-list This document always gives the full form of a command in lowercase letters. Commands are not case sensitive.
Text represented as a command variable | This typeface represents a variable that is part of a command, for example: show card slot_number slot_number is a variable representing the desired chassis slot number.
Text represented as menu or sub-menu names | This typeface represents menus and sub-menus that you access within a software application, for example: Click the File menu, then click New

Command Syntax Conventions | Description
--- | ---
{ keyword or variable } | Required keywords and variables are surrounded by grouped braces. Required keywords and variables are those components that are required to be entered as part of the command syntax.
[ keyword or variable ] | Optional keywords or variables, or those that a user may or may not choose to use, are surrounded by brackets.
| | Some commands support alternative variables. These options are documented within braces or brackets by separating each variable with a vertical bar. These variables can be used in conjunction with required or optional keywords or variables. For example: { nonce | timestamp } OR [ count number_of_packets | size number_of_bytes ]

Obtaining Documentation

The most current Cisco documentation is available on the following website:

http://www.cisco.com/cisco/web/psa/default.html

## Contacting Customer Support

Use the information in this section to contact customer support.

Refer to the support area of http://www.cisco.com for up-to-date product documentation or to submit a service request. A valid username and password are required to access this site. Please contact your Cisco sales or service representative for additional information.