Designing for Cisco Network Service Architectures (ARCH) Foundation Learning Guide

Marwan Al-shawi, CCDE No. 20130066, is a Cisco Press author whose titles include the top Cisco certification design books CCDE Study Guide and Designing for Cisco Network Service Architectures (ARCH) Foundation Learning Guide, Fourth Edition. He also is an experienced technical architect. Marwan has been in the networking industry for more than 12 years and has been involved in architecting, designing, and implementing various large-scale networks, some of which are global service provider-grade networks. Marwan holds a Master of Science degree in internetworking from the University of Technology, Sydney. He enjoys helping and assessing network designs and architectures; therefore, he was selected as a Cisco Designated VIP by the Cisco Support Community (CSC) (official Cisco Systems forums) in 2012 and by the Solutions and Architectures subcommunity in 2014. In addition, Marwan was selected as a member of the Cisco Champions program in 2015 and 2016. In his spare time, Marwan provides CCDP- and CCDE-related training and blogs at netdesignarena.com. Andre Laurent, 3xCCIE No. 21840, CCDE No. 20120024, is the worldwide director of engineering for enterprise networking sales at Cisco Systems and a Cisco Press author. Outside his own personal development, Andre has an equal passion for helping others develop their systems and assisting them with the certification process. Andre is recognized in the industry as a subject matter expert in the areas of routing, switching, security, and design. Although he wears a Cisco badge, Andre takes a neutral approach in helping clients establish a long-term business and technology vision covering necessary strategy, execution, and metrics for measuring impact.

Introduction

Part I Designing Reliable and Resilient Enterprise Layer 2 and Layer 3 Networks

Chapter 1 Optimal Enterprise Campus Design

Enterprise Campus Design Principles

Hierarchy

Access Layer

Distribution Layer

Core Layer

    Enterprise Campus Two-Tier Layer Model

Enterprise Campus Three-Tier Layer Model

Modularity

Modular Enterprise Campus Architecture and Modular Enterprise Campus with OSPF

Access-Distribution Block

Flexibility

Campus Network Virtualization

Campus Network Virtualization Technologies and Techniques

  VLAN Assignment

  Virtual Routing and Forwarding

  Path Isolation Techniques

Resiliency

Enterprise Campus High-Availability Design Considerations

VLANs, Trunking, and Link Aggregation Design Recommendations

  VLAN Design

  Trunking

  Link Aggregation

First-Hop Redundancy Protocol (FHRP)

  IP Gateway Redundancy Optimization with VSS

Layer 2 to Layer 3 Boundary Design Options and Considerations

  Distribution-to-Distribution Link Design Considerations

  A Summary of Enterprise Campus HA Designs

Summary

Review Questions

References

Chapter 2 EIGRP Design

Scalable EIGRP Design Overview

EIGRP with Multiple Autonomous Systems

EIGRP Queries

Multiple EIGRP Autonomous System Drivers

EIGRP Multilayer Architectures

EIGRP Two-Layer Hierarchy Architecture

EIGRP Three-Layer Hierarchy Architecture

EIGRP Hub-and-Spoke Design

Summarization Challenges

  Route Summarization Black Holes

  Route Summarization and Suboptimal Routing

EIGRP Hub-and-Spoke Scalability Optimization

  EIGRP Stub Leaking

EIGRP DMVPN Scaling

EIGRP Fast Convergence Design Considerations

Bidirectional Forwarding Detection

EIGRP Graceful Restart/NSF Considerations

Summary

Review Questions

Chapter 3 OSPF Design

OSPF Scalability Design Considerations

Adjacent Neighbors

Routing Information in the Area and the Routed Domain

Numbers of Routers in an Area

Number of Areas per ABR

OSPF Area Design Considerations

OSPF Hierarchy

Area and Domain Summarization

OSPF Full-Mesh Design

OSPF Hub-and-Spoke Design

OSPF ABR Placement in Hub-and-Spoke Design

Number of Areas in OSPF Hub-and-Spoke Design

OSPF Network Types in Hub-and-Spoke Design

OSPF Convergence Design Considerations and Optimization Techniques

Event Detection

OSPF Event Propagation

OSPF Event Processing

OSPF Flooding Reduction

OSPF Database Overload Protection

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