Book Review: Definitive MPLS Network Designs

I have access to safari books through my employer, so I’ll be doing some brief reviews of each book to determine whether or not I’ll be buying it for further study. The first of this series is Definitive MPLS Network Designs. The book contains several case studies that will be helpful in studying for theContinue reading “Book Review: Definitive MPLS Network Designs”

Fast Convergence Techniques

In reading the SRND on router access layer there are a few key takeaways.On page 5 it says: “Cisco recommends a routed network core in all cases.” Let’s examine the reasoning behind this statement. First of all, what’s the alternative? You can have a layer-2 core where your devices simply switch frames at layer-2. ThinkContinue reading “Fast Convergence Techniques”

IP Routing: Aggregation Concepts and Techniques

Purpose of route aggregation Scalability and fault isolation How to Aggregate What is the purpose of route aggregation? We aggregate routes to decrease the sizes of our routing tables, hide information, and decrease convergence times. The boundary device – ASBR / ABR / whatever – will use a route summarization technique to aggregate prefixes towardsContinue reading “IP Routing: Aggregation Concepts and Techniques”

CCDE Written Outline Topic 5 : Security

Topic 5 : Security is not fleshed out as far as the other four topics, so I thought I would tackle it first. Explain the impact of security availability design in the characteristics of a network.What does this mean? Let’s dig into the subtopics and see if we can find an explanation. OOB Access –Continue reading “CCDE Written Outline Topic 5 : Security”