
305753-A Rev 00
v
Contents
Preface
Before You Begin ............................................................................................................. xv
Text Conventions .............................................................................................................xvi
Acronyms ........................................................................................................................xvii
Related Publications ......................................................................................................xviii
How to Get Help ..............................................................................................................xix
Chapter 1
Introduction
Generic Routing Encapsulation (GRE) ...........................................................................1-1
Network Address Translation (NAT) ................................................................................1-2
Revised IP Security Option (RIPSO) ..............................................................................1-3
Blacker Front End (BFE) .................................................................................................1-4
Chapter 2
Configuring GRE Tunnels
How GRE Tunneling Works ............................................................................................2-2
Avoiding IP Tunnel Misconfiguration ...............................................................................2-5
Announce Policies ....................................................................................................2-5
Accept Policies .........................................................................................................2-6
Static Routes ............................................................................................................2-6
Creating a Generic Routing Encapsulation Tunnel .........................................................2-7
Adding a GRE Tunnel ...............................................................................................2-7
Enabling or Disabling a GRE Tunnel ........................................................................2-9
Deleting a GRE Tunnel ...........................................................................................2-10
Adding and Deleting Protocols for GRE Tunnels ..........................................................2-11
Adding a Protocol to a GRE Tunnel .......................................................................2-11
Adding an IP Protocol Interface .......................................................................2-11
Adding an IPX Protocol Interface .....................................................................2-12
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