Be careful how you apply Ethernet Redundancy in your design. ER was developed for use when there are two remote routers that need to provide redundant DLSw+ connectivity for LAN connected devices.
From your note it seems you might want to balance between two central peers. You can do this with dlsw load-balance command. It's hard to determine exactly what you are attempting to accomplish from your wording.
Take a look at the DLSw+ Design Guide Chapter 3.
http://www.cisco.com/warp/public/cc/pd/ibsw/ibdlsw/tech/tadlt_rg.htm
It might be that you are trying to load balance at the remot side. Here, it might be best to look at segmenting your LAN.
