I. Introduction
II. ISDN Overview
III. ISDN Architecture
A. Functional Model
B. Reference Points
C. ISDN Protocol Model
D. Howard's View of ISDN Architecture
1. B-ISDN and ISDN Architecture
E. PPP Overview
F. PPP Components
G. How PPP Works
H. PPP Physical-Layer Requirements
I. PPP Link Layer
J. PPP Link-Control Protocol
K. PPP Authentication
IV. DDR Overview
V. Legacy DDR
A. Basic ISDN Configuration
B. Dialer-list Configuration
C. PPP Multilink
D. PPP Reliable Link
E. Other Common DDR Interface Commands
VI. Dialer Profiles
A. Removing Legacy DDR Commands
B. Configuring a Logical Dialer Interface
VII. Snapshot Routing
A. Configuring the Snapshot Client
B. Configuring the Snapshot Server
VIII. OSPF and On-Demand Circuits
IX. Dial Backup
X. Floating Static Routes
XI. Conclusion