Resilient Network Design Concepts

5/7/06


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Table of Contents

Resilient Network Design Concepts

“The Janitor Pulled the Plug…”

Network Design and Architecture…

What is a Well-Designed Network?

The Three-legged Stool

New World vs. Old World

New World vs. Old World

How Do We Get There?

Redundant Network Design

Basic ISP Scaling Concepts

Modular/Structured Design

Modular/Structured Design

Functional Design

Tiered/Hierarchical Design

Multiple Levels of Redundancy

Multiple Levels of Redundancy

Multiple Levels of Redundancy

Multiple Levels of Redundancy

Redundant Network Design

The Basics: Platform

The Basics: Environment

Redundant Network Design

Bad Architecture (1)

Bad Architecture (2)

Even Worse!!

Typical (Better) Backbone

The best architecture

Benefits of Layer 3 backbone

Redundant Network Design

Multi-homed Servers

HSRP – Hot Standby Router Protocol

HSRP – RFC 2281

HSRP

Redundant Network Design

Circuit Diversity

Circuit Diversity

Circuit Diversity

Circuit Bundling – MUX

Circuit Bundling – MLPPP

Load Sharing

Load Sharing

Policy-based Routing

Convergence

Factors Determining Protocol Convergence

OSPF – Hierarchical Structure

Factors Assisting Protocol Convergence

Redundant Network Design

PoP Design

PoP Design

PoP Design – Wrong

PoP Design – Correct

Hubs vs. Switches

Hubs vs. Switches

Beware Static IP Dial

Redundant Network Design

Network Operations Centre

Operations

Operations

In Summary

Acknowledgements

 Author: Sunday Folayan

Home Page: http://www.ws.afnog.org

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