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Part V: High Availability
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Part V: High Availability
by Marwan Al-shawi
CCDE Study Guide
About This eBook
Title Page
Copyright Page
About the Author
About the Technical Reviewers
Dedication
Acknowledgments
Contents at a Glance
Contents
Icons Used in This Book
Introduction
Who Should Read This Book?
CCDE Practical Exam Overview
Job Tasks
Exam Job Domains
Exam Technologies
PPDIOO Approach and the CCDE Job Domains
PPDIOO and Tasks
Final Thoughts on the CCDE Practical Exam
How This Book Is Organized
Final Words
Part I: Business-Driven Strategic Network Design
Chapter 1. Network Design Requirements: Analysis and Design Principles
Design Scope
Business Requirements
Business Continuity
Elasticity to Support the Strategic Business Trends
IT as a “Business Innovation” Enabler
The Nature of the Business
Business Priorities
Functional Requirements
Technical Requirements
Application Requirements
Design Constraints
Crafting the Design Requirements
Planning
Decision Tree
Decision Matrix
Planning Approaches
Strategic Balance
Network Design Principles
Reliability and Resiliency
Modularity
Reliable and Manageable Scalability
Fault Isolation and Simplicity
Hierarchy
Responsiveness
Holistic Design Approach
Physical Layout Considerations
No Gold Plating
Summary
Part II: Next Generation - Converged Enterprise Network Architectures
Chapter 2. Enterprise Layer 2 and Layer 3 Design
Enterprise Layer 2 LAN Design Considerations
Spanning Tree Protocol
VLANs and Trunking
Link Aggregation
First Hop Redundancy Protocol and Spanning Tree
Enterprise Layer 2 LAN Common Design Options
Layer 2 LAN Design Recommendations
Enterprise Layer 3 Routing Design Considerations
IP Routing and Forwarding Concept Review
Link-State Routing Protocol Design Considerations
EIGRP Design Considerations
Hiding Topology and Reachability Information Design Considerations
IGP Flooding Domains Design Considerations
Route Summarization
IGP Traffic Engineering and Path Selection: Summary
OSPF
IS-IS
EIGRP
Summary of IGP Characteristics
BGP Design Considerations
Interdomain Routing
BGP Attributes and Path Selection
BGP as the Enterprise Core Routing Protocol
BGP Scalability Design Options and Considerations
Further Reading
Route Redistribution Design Considerations
Single Redistribution Boundary Point
Multiple Redistribution Boundary Points
Route Filtering Versus Route Tagging with Filtering
Enterprise Routing Design Recommendations
Determining Which Routing Protocol to Use
Summary
Chapter 3. Enterprise Campus Architecture Design
Enterprise Campus: Hierarchical Design Models
Three-Tier Model
Two-Tier Model
Enterprise Campus: Modularity
When Is the Core Block Required?
Access-Distribution Design Model
Enterprise Campus: Layer 3 Routing Design Considerations
EIGRP Versus Link State as a Campus IGP
Enterprise Campus Network Virtualization
Drivers to Consider Network Virtualization
Network Virtualization Design Elements
Enterprise Network Virtualization Deployment Models
Summary
Further Reading
Chapter 4. Enterprise Edge Architecture Design
Enterprise WAN Module
WAN Transports: Overview
Modern WAN Transports (Layer 2 Versus Layer 3)
Internet as WAN Transport
WAN Transport Models Comparison
WAN Module Design Options and Considerations
Remote Site (Branch) WAN Design Considerations
Enterprise WAN Module Design Options
WAN Virtualization and Overlays Design Considerations and Techniques
WAN Virtualization
Enterprise WAN Migration to MPLS VPN Considerations
Migrating from Legacy WAN to MPLS L3VPN WAN Scenario
Enterprise Internet Edge Design Considerations
Internet Edge Architecture Overview
Enterprise Multihomed Internet Design Considerations
Asymmetrical Routing with Multihoming (Issue and Solution)
Summary
Part III: Service Provider Networks Design and Architectures
Chapter 5. Service Provider Network Architecture Design
Service Provider Network Architecture Building Blocks
Point of Presence
Service Provider Network Core
Service Provider Control Plane Logical Architectures
IGP in Service Provider Networks
BGP in Service Provider Networks
Multiprotocol Label Switching
Multiprotocol BGP
MPLS Traffic Engineering
Business and Technical Drivers
MPLS-TE Planning
MPLS-TE Design Considerations
Summary
Further Reading
Chapter 6. Service Provider MPLS VPN Services Design
MPLS VPN (L3VPN)
MPLS L3VPN Architecture Components
L3VPN Design Considerations
PE-CE L3VPN Routing Design
Layer 2 MPLS VPN (L2VPN)
IP NGN Carrier Ethernet
Virtual Private Wire Service Design Considerations
Virtual Private LAN Service Design Considerations
Final Thoughts: L2VPN Business Value and Direction
Service Provider Control Plane Scalability
IGP Scalability Considerations
Route Reflection Design Options in SP Networks
Hierarchical LSP (Unified MPLS)
Summary
Further Reading
Chapter 7. Multi-AS Service Provider Network Design
Inter-AS Design Options and Considerations
Inter-AS Option A: Back-to-Back VRF (VRF-to-VRF)
Inter-AS Option B: ASBR to ASBR with MP-eBGP Approach
Inter-AS Option C: Multihop MP-eBGP Between RR
Inter-AS Option D
Inter-AS IPv6 VPN
Inter-AS MPLS-TE
Inter-AS L2VPN
Inter-AS QoS
Comparison of Inter-AS Connectivity Options
Carrier Supporting Carrier
Non-MPLS Customer over MPLS VPN Carrier
MPLS Customer over MPLS VPN Carrier
MPLS VPN Customer over MPLS VPN Carrier
MPLS VPN Customer over MPLS Carrier
MPLS VPN Customer over IP-Only Carrier
Acquisition of an MPLS-L3VPN Service Provider Design Scenario
Background Information
Design Requirements
Available Interconnection Options
Inter-AS Connectivity Model Selection
Proposed Solution
Network Merger implementation Plan
Summary
Part IV: Data Center Networks Design
Chapter 8. Data Center Networks Design
Traditional Data Center Network Architecture
STP-Based Data Center Network Architecture
mLAG-Based Data Center Network Architecture
Next-Generation Data Center Network Design
Data Center Virtualization and Cloud-Based Services Overview
Drivers Toward New Fabric-Based Data Center Network Architectures
Modern Data Center Network Architectures and Overlays
Comparison of Data Center Network Architectures
Data Center Interconnect
DCI Building Blocks
DCI Connectivity Options
DCI Design Considerations
Summary
Further Reading
Part V: High Availability
Chapter 9. Network High-Availability Design
Fault Tolerance
Fate Sharing and Fault Domains
Network Resiliency Design Considerations
Device-Level Resiliency
Protocol-Level Resiliency
Summary
Further Reading
Part VI: Other Network Technologies and Services
Chapter 10. Design of Other Network Technologies and Services
IPv6 Design Considerations
IPv6 Business and Technical Drivers
IPv6 Addressing Types (Review)
Migration and Integration of IPv4 and IPv6
Transition to IPv6: Scenario
Further Reading
IP Multicast Design Considerations
Enterprise Multicast Design Options and Considerations
SP Multicast Design Options and Considerations
Multicast Resiliency Design Considerations
Final Thoughts on IP Multicast Design
Further Reading
QoS Design Considerations
QoS High Level Design: Business-Driven Approach
QoS Architecture
QoS DiffServ Architecture and Toolset
Enterprise QoS Design Considerations
Service Provider QoS Design
Further Reading
Network Security Design
Network Security Design Fundamentals
Network Infrastructure Security Considerations
Further Reading
Network Management
Fault, Configuration, Accounting, Performance, and Security
Network Management High-Level Design Considerations
Multitier Network Management Design
Further Reading
Summary
Appendix. References
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Chapter 8. Data Center Networks Design
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Chapter 9. Network High-Availability Design
Part V: High Availability
Chapter 9
Network High-Availability Design
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