By Alvaro Retana, Don Slice, Russ White
Complicated IP community layout offers the suggestions community engineers and bosses have to develop and stabilize huge IP networks. know-how developments and company development necessarily bring about the need for community growth. This publication provides layout suggestions and strategies that allow networks to adapt into helping greater, extra advanced purposes whereas protecting serious balance. complex IP community layout provide you with a uncomplicated beginning to appreciate and enforce the most productive community layout round the community middle, distribution and entry layers, and the typical and aspect community prone. After developing an effective hierarchical community layout, you are going to discover ways to practice OSPF, IS-IS, EIGRP, BGP, NHRP, and MPLS. Case reviews help every one protocol to supply you with necessary options to universal obstacles encountered while imposing an IGP- or EGP-based community.
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Distribution Redundancy Now that some core designs have been covered, the redundant designs for the distribution layer will be discussed. " Additional issues with redundancy and addressing are discussed in that chapter. The two most common methods for providing redundancy at the distribution layer are dual homing and backup links to other distribution layer routers. The main consideration when designing redundancy in the distribution layer is unexpected traffic patterns. 57 Dual Homing to the Core In Figure 3-8, Router A has two connections to the core through separate routers.
Side A of Figure 3-13 illustrates this single point of failure. Figure 3-13 Redundancy to Common Shared Resource, Such as a Server Farm In the network illustrated by Side B of Figure 3-13, the server farm has been connected to two core routers, so the failure of a single router will not affect the reachability of the server farm. In a similar way, Figure 3-14 illustrates multiple connections to an external routing domain for redundancy. In this case, the links to the external routing domain are directly attached to the core.
Review 1: Why is it difficult to change addresses after they've been assigned? 2: Why is address allocation so closely tied to network stability? 3: What are the goals you should keep in mind when allocating addresses? 4: What does it mean to say that summarization hides topology details? 45 5: How does hiding topology details improve stability? 6: Where should summarization take place? 7: What is the one case where access layer devices should be passed more than a default route? Why? 8: An IP address can be divided into two parts; what are they?
Advanced IP network design by Alvaro Retana, Don Slice, Russ White