The conventions used to present command syntax in this book are the same conventions used in the IOS Command Reference. The Command Reference describes these conventions as follows:
Bold indicates commands and keywords that are entered literally as shown.
Italic indicates arguments for which you supply actual values.
Vertical bars (|) separate alternative, mutually exclusive elements.
Square brackets ([ ]) indicate an optional element.
Braces ({ }) indicate a required choice.
Braces within brackets ([{ }]) indicate a required choice within an optional element.