Icons Used in This Book
Command Syntax Conventions
The conventions used to present command syntax in this book are the same conventions used in Cisco’s 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 manually input 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 optional element.
Note
This book covers multiple operating systems, and a differentiation of icons and router names indicates the appropriate OS that is being referenced. IOS and IOS XE use router names like R1 and R2 and are referenced by the IOS router icon. IOS XR routers will use router names like XR1 and XR2 and are referenced by the IOS XR router icon.