The current situation that I have is as follows. We have a core 6500 switch that has a PRI module in it that binds (4) T1 lines together and we also have a 2600 Rtr that binds 4 other T1 lines together and pipes them into a ASA5520. We are changing WAN vendors but still have to maintain the (8) T1 connections until our contract runs out, which will be in a few years. The 8 T1's are not enough bandwith for our operation and we will be adding a 20meg WAN link in the next month. What I am trying to figure out is how to best integrate 3 different WAN links into one LAN. What I am thinking of doing is to leave the 6500 core switch as is and then to purchase a router that can hold (4) T1 wics and the 20meg link. Is it possible to bind those 5 links together even though they are different vendors? My initial thought would be no but I am not sure. I am looking for a little advice.
I have this problem too.