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Interconnecting Data Centers Using VPLS (Ensure Business Continuance on Virtualized Networks by Implementing Layer 2 Connectivity Across Layer 3), Rough Cuts

Interconnecting Data Centers Using VPLS (Ensure Business Continuance on Virtualized Networks by Implementing Layer 2 Connectivity Across Layer 3), Rough Cuts

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  • Copyright 2009
  • Dimensions: 7-3/8" x 9-1/8"
  • Pages: 384
  • Edition: 1st
  • Rough Cuts
  • ISBN-10: 1-58705-997-5
  • ISBN-13: 978-1-58705-997-1

This is the Rough Cut version of the printed book.

As data centers grow in size and complexity, enterprises are adopting server virtualization technologies such as VMware, VMotion, NIC teaming, and server clustering to achieve increased efficiency of resources and to ensure business resilience. However, these technologies often involve significant expense and challenges to deal with complex multisite interconnections and to maintain the high availability of network resources and applications.

Interconnecting Data Centers Using VPLS presents Virtual Private LAN Service (VPLS) based solutions that provide high-speed, low-latency network and Spanning Tree Protocol (STP) isolation between data centers resulting in significant cost savings and a highly resilient virtualized network. The design guidance, configuration examples, and best practices presented in this book have been validated under the Cisco Validated Design (CVD) System Assurance program to facilitate faster, more reliable and more predictable deployments. The presented solutions include detailed information about issues that relate to large Layer 2 bridging domains and offer guidance for extending VLANs over Layer 3 networks using VPLS technology.

Implementing this breakthrough Data Center Interconnect (DCI) strategy will evolve your network to support current server virtualization techniques and to provide a solid foundation for emerging approaches. The book takes you from the legacy deployment models for DCI, problems associated with extending Layer 2 networks, through VPN technologies, to various MST-, EEM-, and GRE-based deployment models and beyond. Although this book is intended to be read cover-to-cover, it is designed to be flexible and allow you to easily move between chapters to develop the solution most compatible with your requirements.

  • Describes a variety of deployment models to effectively transport Layer 2 information, allowing your virtualization solution to operate effectively
  • Explains benefits and trade-offs of various solutions for you to choose the solution most compatible with your network requirements to ensure business resilience
  • Provides detailed design guidance and configuration examples that follow Cisco best practice recommendations tested within the CVD

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.

Sample Content

Table of Contents

Introduction xv

Chapter 1 Data Center Layer 2 Interconnect 1

Overview of High-Availability Clusters 2

Public Network Attachment 3

Private Network Attachment 3

Data Center Interconnect: Legacy Deployment Models 4

Problems Associated with Extended Layer 2 Networks 5

Summary 7

Chapter 2 Appraising Virtual Private LAN Service 9

VPN Technology Considerations 9

Layer 3 Virtual Private Networks 10

Layer 2 Virtual Private Networks 10

VPLS Overview 11

Understanding Pseudowires 14

VPLS to Scale STP Domain for Layer 2 Interconnection 15

H-VPLS Considerations 17

EEM 18


Label Switching Functions 19


MPLS LDP Targeted Session 20

Limit LDP Label Allocation 21

MPLS LDP-IGP Synchronization 21

MPLS LDP TCP “Pak Priority” 21

MPLS LDP Session Protection 22

Summary 22

Chapter 3 High Availability for Extended Layer 2 Networks 23

MTU Evaluation for Intersite Transport 23

Core Routing 25

Mixed MPLS/IP Core 26

Different IGP for IP Core and MPLS 27

Same IGP for IP Core and MPLS 27

Pure MPLS Core 28

Pure IP Core 30

Convergence Optimization 32

Key Convergence Elements 33

Failure Detection and Tuning 33

IP Event Dampening 34

BFD 35

Link Debounce Timer 37

Carrier-Delay Timer 38

Alternate Route Computation 40

Summary 42

Chapter 4 MPLS Traffic Engineering 43

Understanding MPLS-TE 43

Fast Reroute 44



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