We have a 2610 and two T-1's that are from the same service provider and we have recently ugraded them to full lines from the fractional lines we were using. Our line change also included setting the two T-1's up in a load balanced configuration.
After rolling this around in my head and watching the traffic I don't think we are truly using the lines correctly. Here's why: the router only has a 10-base Ethernet port.
Since the 2610 is connected to a Firebox2 (which has a 10/100 interface) at 10Mb, can we really make use of the two lines? Right now bottlenecks happen at the threshold of a single T-1. Or is this more of an configuration issue? I have checked our router config against a sample from or ISP and it seems to be OK. Is there anything I can do to check this? Our monthly reports show only very tiny inbound traffic on the second line. Under load balancing I would expect the two lines to be even despite the ethernet connection.
Right now I think we need to go with a router that has a 10/100 interface (2620?) in order to fix this. Any help is greatly appreciated.