> About this Guide
> This document pertains to the features and functionality that run on and/or that are related to the Cisco® ASR 5x00 Chassis.
> This preface includes the following sections:

> • | Conventions Used

> • | Contacting Customer Support

> • | Additional Information

> 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.
> | Electrostatic 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 text that appears on your terminal screen, for example: Login:
> Text represented as commands | This typeface represents commands that you enter at the CLI, 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 braces. They must be entered as part of the command syntax.
> [ keyword or variable ] | Optional keywords or variables that may or may not be used 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 ]

> ‌
> Contacting Customer Support
> Go to http://www.cisco.com/cisco/web/support/ to submit a service request. A valid Cisco account (username and password) is required to access this site. Please contact your Cisco account representative for additional information.
> Additional Information
> Refer to the following guides for supplemental information about the system:

> • | Command Line Interface Reference

> • | Statistics and Counters Reference

> • | Thresholding Configuration Guide

> • | SNMP MIB Reference

> • | Cisco Web Element Manager Installation and Administration Guide

> • | Product-specific and feature-specific administration guides

> • | Release Notes that accompany updates and upgrades to StarOS

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