Vendors and Change
Your vendors, whether consultancies, ISPs, ISVs, VARs, and so on, get repeat business based on how well you are treated, and so, if they’re smart, they do have your best interests at heart. Still, vendors can be a major source of unintended consequences at the worst possible times.
Several factors will affect the types of changes—and the timing of changes—that vendors cause to your network. Although vendors do want to do a good job for you, they have several other warring desires at work. Remember, like people, there are good vendors and there are bad vendors. (Of course, this is also true of internal staff.)
The following are some factors that might affect the way a vendor performs on a job on your network. The really good ...