Dual-Multihomed
The last general category of Internet access topologies is called dual-multihomed. With this design, two or more ISPs are used, with two or more connections to each. A number of different routers can be used. Figure 13-15 shows several examples.
Figure 13-15 Dual-Multihomed Options
Figure 13-15 does not show all design options, but because at least two ISPs exist, with at least two connections per ISP, much redundancy exists. That redundancy can be used for backup, but most often, BGP is used to make some decisions about the ...
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