The cleanest way to provide redundancy for your single router is to use a second router and put one T1 on each router. However, you need to examine your situation carefully first, as the router is far from the only single point of failure in your environment... you also need to worry about the hub/switch between the routers and firewall, the firewall, the hub/switch on the user side of the firewall, electrical power, and the physical diversity of your two T1 lines.

Unless you have already paid attention to these factors, your most likely cause of additional downtime is simultaneous failure of both of your T1 lines (which are probably in the same telco cable bundle under the streets between your building and the central office, if not all the way to your wall jacks).

After that, your most likely cause of failure is dead batteries in your UPS (you do have a UPS, if not, move power to the most likely cause of failure).

After that, your most likely cause of failure is human error. You do have processes and procedures in place to control who can change configurations and testing of those configuration changes before putting them into production???

It is very easy to spend a lot of money on redundancy, but you need to invest in planning and understanding to gain significant availabilty increases from the redundancy.

Good luck and have fun!

Vincent C Jones

www.networkingunlimited.com