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Cisco Router Firewall Security by Richard A. Deal

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Command Syntax Conventions

The conventions used to present command syntax in this book are the same conventions used in the Cisco IOS Command Reference. The Command Reference describes these conventions as follows:

Boldface indicates commands and keywords that are entered literally as shown. In actual configuration examples and output (not general command syntax), boldface indicates commands that are input manually by the user (such as a show command).

Italics indicate arguments for which you supply actual values.

• Vertical bars (|) separate alternative, mutually exclusive elements.

• Square brackets [ ] indicate optional elements.

• Braces { } indicate a required choice.

• Braces within brackets [{ }] indicate a required choice within an ...

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