By Alvaro Retana, Don Slice, Russ White
Complex IP community layout presents the recommendations community engineers and executives have to develop and stabilize huge IP networks. know-how developments and company progress unavoidably bring about the need for community growth. This ebook provides layout techniques and methods that permit networks to adapt into aiding greater, extra advanced purposes whereas keeping serious balance. complicated IP community layout will give you a simple origin to appreciate and enforce the best community layout round the community center, distribution and entry layers, and the typical and part community prone. After setting up an effective hierarchical community layout, you are going to learn how to observe OSPF, IS-IS, EIGRP, BGP, NHRP, and MPLS. Case experiences aid every one protocol to supply you with worthwhile suggestions to universal obstacles encountered whilst enforcing an IGP- or EGP-based community.
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Additional resources for Advanced IP network design
1. 0/24 down to two. If access layer redundancy is provided using links between access devices, it's important to provide enough bandwidth to handle the traffic from both remote sites toward the core. Figure 3-11 Redundancy through Interconnected Access Layer Devices Either of these solutions would work well as long as the redundant route is not advertised until needed, so traffic won't normally flow across the redundant link. Dial-on-demand circuits work well for these types of applications. It is possible to design load sharing and redundancy within the access layer, as Figure 3-12 illustrates.
This allows about 32,000 simultaneous sessions from the inside to the outside using one inside global address. See Figure 2-18 for an example of PAT translated address. Figure 2-18 PAT Translations 44 Assuming that each inside host is likely to have 10 open sessions to outside hosts at any time, about 3,000 inside hosts could be represented by one outside address. 10 prefix-length 30 ip nat inside source list 1 pool tothenet overload ! interface Ethernet 0 ip nat inside ! interface Serial 0 ip nat outside !
This can cause very poor routing performance. So if this is the problem, why would you ever want to point a static route to an interface? Go back and examine Router B to see why. In this case, the default route points to a point-to-point interface, which means there will not be any ARP cache entries against this interface. ) There is one advantage to Router B's configuration—speed. Suppose that Router B has a dial backup link to the Internet, which is activated through a floating static route. If serial 0 goes down, Router B will take the directly connected network out of its routing table immediately.
Advanced IP network design by Alvaro Retana, Don Slice, Russ White