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High Availability Network Fundamentals by Chris Oggerino

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Major Network Service Construct Availability

Our network includes three major services. The PSTN access, Internet access, and network control services for our network are not only redundant but are completely duplicated. Calculating the scenarios will be easier if we determine the availability of these major services first.

As we did in the previous section, we calculated serial component availability and then used that in parallel equations. We will again perform similar operations for each of our major services in this section.

The Internet Access Service Availability

If you look in the Scenario 1 RBD shown in Figure 9-6, you will see that the Internet is available via two different connections, each of which is redundant all by itself. Previously ...

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