Building MPLS-based broadband access VPNs
Author(s)
Bibliographic Information
Building MPLS-based broadband access VPNs
（Cisco Press networking technology series）
Cisco Press, c2005
Note
Includes bibliographical references (p. [341]-355) and index
Description and Table of Contents
Description
Implement the design principles and configurations behind MPLS-based VPNs for broadband access networks
The book discusses how MPLS and its VPN service are best used in a broadband environment, concentrating on key design issues and solutions, including
How to manage tens of thousands of interfaces and host routes and hundreds of dynamic VPNs
When a Virtual Home Gateway is necessary
Why use dynamic address assignment
How routes should be summarized into the core
Deploy MPLS VPNs successfully in broadband networks with Building MPLS-Based Broadband Access VPNs. This book helps you understand why and how today's broadband networks function, covering the principal access technologies: DSL, Ethernet, and cable. The book also examines the different tunneling protocols used for VPN solutions today, namely GRE, IPSec, and L2TP, with examples of how these solutions are deployed and a discussion of their strengths and weaknesses.
Building MPLS-Based Broadband Access VPNs also includes an in-depth description of the IOS VRF Lite, which helps you use VRF-aware features with an IP core.
Detailed descriptions of the technologies, design principles, network configurations, and case studies are provided throughout the book, helping you develop a pragmatic understanding of MPLS-based broadband access VPNs.
Obtain a realistic understanding of large-scale broadband access network design requirements
Recognize the business impact of using MPLS to provide access VPN services, including the advantages of QoS, availability, and provisioning
Use MPLS in access VPN and transport networks and deal with the unique scalability problems that such networks pose
Leverage VRF-aware features to deploy IP-based VPNs
Includes detailed Cisco IOS configuration examples based on real-world scenarios
This book is part of the Networking Technology Series from Cisco Press? which offers networking professionals valuable information for constructing efficient networks, understanding new technologies, and building successful careers.
Table of Contents
Foreword
Introduction
Chapter 1 Introduction: Broadband Access and Virtual Private Networks Broadband Networks and Operators
The Players in Broadband
DSL Networks
Metropolitan-Area Networks
The Role of the Access Network
Shifting the Location of the Processing
Service Models: Who Buys What
Business Subscribers
Residential Subscribers
IP Virtual Private Networks for Broadband
A VPN Taxonomy
Layer 2 and Layer 3 VPN Alternatives
Overlay VPNs
The Peer Model
A Simplified Framework for Broadband VPN
Data Confidentiality
Efficient Operation
Efficient Routing
High Availability and Resiliency
Device-Level Redundancy
Network-Level Redundancy
Multicast
Quality of Service
Fragmentation
Authentication, Authorization, and Accounting (AAA)
Service Selection
Support for Any IP Addressing Plan
Efficient Address Assignment
Additional Layer 3 Services
Summary
Chapter 2 Delivering Broadband Access Today: An Access Technologies Primer Architecture 1: Bridged Access Networks
Bridging in DSL Using RFC 2684
RBE Configuration
RBE Quality of Service
RBE Routing
RBE Address Assignment
More Bridged Access-Cable and DOCSIS
DOCSIS Cisco IOS Configuration
Cable Address Assignment
Broadband Ethernet-Ethernet to the Home/Business (ETTX)
Long Reach Ethernet
ETTX Configuration
ETTX Quality of Service
ETTX Address Assignment
Security Considerations for Bridged Broadband Architectures
Security in DSL Broadband Networks
Security in Cable Broadband Networks
Security in Ethernet Broadband Networks
Authentication and Accounting in Bridged Broadband Architectures
Architecture 2: Point-to-Point Protocol Networks
PPP over Ethernet-The CPE as a Bridge
PPPoE Configuration
PPPoE Service Selection and Discovery
PPP over ATM: The CPE as a Router
PPPoA Configuration
PPP Address Assignments
Use of On-Demand Address Pools
PPP Quality of Service
PPP Authentication, Accounting, and Security
Port-Based Authentication
PPP Security
Summary
Chapter 3 VPNs in Broadband Networks Tunnels, Hubs, and Spokes
To Distribute or Centralize?
Access VPN Requirements Reminder
Case 1: A Site VPN with Non-IP Traffic-GRE
GRE Protocol and Operation
GRE Configuration
GRE Design Considerations
Case 2: VPN over Anything-IPSec
IPSec Protocol and Operation
AH and ESP Headers for Authentication and Encryption
Key Exchange with IKE
IPSec Tunnel and Transport Mode Encapsulations
IPSec Configuration
IPSec Configuration Examples
Simple Site-to-Site IPSec
Encrypted GRE
Dynamic Multicast VPN
IPSec for Remote Access
IPSec Design Considerations
Case 3: L2TP-For Open Access
L2TP Protocol and Operation
L2TP Tunnel Setup
L2TP Session Setup
L2TP Configuration
Scaling L2TP Networks
Data Plane: L2TP LNS Redundancy and Load Balancing
Control Plane: AAA Redundancy and Load Balancing
L2TP Tunnel Switching
L2TP Design Considerations
Other Open Access Solutions
Open Access with Network Address Translation
Open Access with Policy-Based Routing
Summary
Chapter 4 Introduction to MPLS Definition of MPLS
IP and MPLS Packet Forwarding
MPLS Encapsulation
Label Distribution
LDP Operation
Traffic Engineering
MPLS-TE Cisco IOS Configuration
Layer 3 VPN Services (RFC 2547)
MPLS-VPN Attributes
MPLS-VPN Cisco IOS Configuration
MPLS QoS
QoS in MPLS Packet Headers
Complication 1: DSCP
Complication 2: ATM
Tunnels and Pipes
DiffServ-Aware Traffic Engineering
Summary
Chapter 5 Introduction to MPLS-Based Access VPN Architectures Architecture Overview of an MPLS-Based Access VPN
The Role of the PE
Mapping Cable Subscribers to VRFs
Mapping Ethernet Subscribers to VRFs
Mapping DSL Subscribers to VRFs
Routed Interfaces
Routed Bridge Encapsulation
PPP
Virtual Home Gateway
VHG for Cable or Ethernet
Examples of the Basic Architectures
Direct PPP Termination Configuration
Monitoring Direct PPP Termination
Two-Box Virtual Home Gateway Example
Monitoring the Two-Box VHG Solution
Multi-VRF CE Configuration
Comparison Using the Broadband VPN Framework
Data Confidentiality
Efficient Operation
Efficient Routing
High Availability and Resiliency
Multicast
Quality of Service
Fragmentation
Authentication, Authorization, and Accounting
Service Selection
Support Any IP Addressing Plan
Efficient Address Management
Additional L3 Services
Summary
Chapter 6 Wholesale MPLS-VPN Related Service Features Bindings Again-Dynamic VRF Allocation
AAA Again-VRF Name and the AAA Attribute
Direct PPP Termination and Aggregation with AAA
VHG with AAA
DHCP-Life Without AAA
PBR-A Two-Box Solution
Service Selection Gateway-Another Two-Box Solution
VRF Select
Proxy RADIUS and Per-VRF AAA
Per-VRF AAA Configuration
Per-VRF AAA Templates
Per-VRF AAA Accounting
Assigning and Managing Overlapping Addresses
Overlapping Device-Local Pools
On-Demand Address Pools
The Host Route Solution
ODAP and Address Assignments
Summary
Chapter 7 Implementing Network-Based Access VPNs Without MPLS Introduction to Virtual Routers
Implementing Virtual Routing with Cisco IOS
Using Tunnels to Build Network-Based IP VPN
Using GRE for IP VPN
Using IPSec for IP VPN
Routing Between VRF-Lite PEs
Campus Hop-to-Hop Topology
RIP Between VRF-LITE
RIP to BGP
Summary
Chapter 8 Case Studies for Using MPLS with Broadband VPNs Case Study 1: Managed LNS
Service Definitions
L2TP-Based Wholesale Service: Managed LNS
Clients
Circuit Aggregation: LAC
IP Aggregation: LNS
Control Plane: AAA
Network and Service Availability
MPLS-Based Wholesale Service
Clients
PTA PE
ISP PE
Address Allocation and Routing
Control Plane: AAA
QoS and Multicast
Case Study 2: D/V/V Over Ethernet
Service Definitions
Network Design
Clients
Access Layer: Circuit Aggregation
Distribution Layer: IP Aggregation
Adding Open Access
An Alternative Open Access Design
Summary
Chapter 9 Future Developments in Broadband Access Introduction to IPv6
Address Space Size
Addressing
Extensions
Autoconfiguration
Deployment Scenarios of IPv6
Enterprise Deploys IPv6 Internally but Uses an IPv4 VPN Service
A Retail ISP Moves to IPv6
Only the Wholesaler Moves to IPv6
L2 Transport and L2VPN
Pseudo-wires
AToM
L2 Transport over L2TPv3
Applications and Implications for Broadband Access
Summary
Appendix A References and Bibliography Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapters 5, 6, 7, and 8
Chapter 9
Indx
by "Nielsen BookData"