Command Syntax Conventions

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

Boldface indicates commands and keywords that are entered literally as shown. In examples (not syntax), boldface indicates user input (for example, a show command).
Italics indicates arguments for which you supply values.
Square brackets ([ and ]) indicate optional elements.
Braces ({ and }) contain a choice of required keywords.
Vertical bars (|) separate alternative, mutually exclusive elements.
Braces and vertical bars within square brackets?for example, [x {y | z}]?indicate a required choice within an optional element. You do not need to enter what is in the brackets, but if you do, you have some required choices in the braces.