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Building Resilient IP Networks: The Access Module


  1. Multilayer Campus Design
  2. Access Module Building Blocks
  3. Layer 2 Domain
  4. Layer 3 Domain
  5. Summary

Chapter Description

This chapter focuses on Ethernet switching technology, specifically Layer 2 network resiliency and how it should be built to provide a solid foundation for the Layer 3 network.

Access Module Building Blocks

This section focuses on the individual building blocks shown in Figure 6-3. Making these individual building blocks rock solid is critical, because it is how the end users are connected to the network. These building blocks are to be found in the data center module, too, which you learn about in Chapter 9, "Data Center Module." The well-being of an individual building block network relies on two factors:

  • How well the Layer 2 domain behaves within the building block
  • How its Layer 3 function interacts with the end devices and how well it is connected to the core layer

Figure 6-3 Building Blocks for the Access Module

The rest of this chapter describes the Layer 2 and Layer 3 domains. Within the Layer 2 domain, the focus is on resilient switching design, whereas the focus for the Layer 3 domain is on resilient IP services and routing design.

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