Basically they will be paired in distribution Areas
Currently there are over 150 vlans ,per distribution area which will be using Vrrp , Ospf eaps and mlag ( proposal to move away from eaps ).DSCP will be configured , currently using IPv4 , with various multicast Sparse Mode ... IPv6 is currently being discussed.. we are looking to a 5-7 year operating life cycle , so we like the 40-100 gig options. So we are looking at a network , where each pair of distribution switches needs to be capable of supporting 96 resilient edge stacks at 10gig ( eaps or Mlag )