[USR-TC] TC-1000 and Lucent in a stack

We have both TC-1000 and Lucent MAX TNT/MAX6000s in our network. We need a work-around for MPP users. 3Com uses MPIP and Lucent uses Stack Protocol for MPP. Besides, Lucent requires that boxes are in the same LAN segment while 3Com does not. Anybody have any comments?