Question : Building a redundant network.

My small company needs to scale up, and with that, our SLA is also going up. I'm in a bit over my head on building a fully redundant network. (there must be no single point of failure). Load balancing is not a major concern as we do not have that much traffic. This is all about trying to acheive 99.999% or 99.9999% up time.

We have to connections to the world coming in. One from a Teir1 provider and another form a Tier2.
We have a dozen hosts behind this network, each host has dual nic.

We will be setting up a mirror location, geographically far apart, within six months.

I imagine that I will need two Border Gateway Protocol boxes, one for each of our connections? Beyond that, I really don't have much of an idea. Any guidance in the right direct will be greatly appreciated.

Answer : Building a redundant network.

If you have a specifc set of publci IP addresses that you want accessed over the Internet then the answer is no.  BGP is the standard and will need to be used to access your IPs from two different ISPs.