Often times in network operations we're required to perform to a certain service level agreement. This is typically defined as "
uptime" or "network availability" meaning that the network team will work to make sure that the network is available xx% of the time. Predominately these
SLA's are in the 99% level. There are basically 4 levels of "99%"
uptime levels: 99%, 99.9%, 99.99%, and the incredibly expensive 99.999% (or 5-9's).
So what does this mean to you as a network manager in terms of being able to take the network down for maintenance? I put together this little chart to show you how much time you get based on your
SLA requirements:
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