In an effort to better understand high availability I have a question. It's clear that high availability, specifically high availability clustering is a means to ensure the capable devices in question are always available with virtually no down time ever being noticed.
With that being said, what about at the port level or the WAN level? I am aware of port aggregation and link aggregation.. but I guess the real question here is it seems High Availability is mostly geared towards the specific availability of the hardware at whole, not necessarily the specific availability of say a port or a routing protocol.
If this is indeed the case. Theoretically speaking what would be the "most available" configuration possible? Most Likely it would include some type of: clustering, load balancing, port and link aggregation, cloud/hybrid environments, multiple sites/data centers, etc. What am I missing? Trying to get the overall concept correctly. Thanks.
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