I've a ring topology where run REP with Cisco ME-34xx and works fine. However I deployment others 'non-REP' switches in this ring. After do it, a fail betwen non-REP switches, dosen't change the REP topology and keeps the Aternated port in Block state, and isolated non-REP switch. I've used "edge no-neighbor" in the edge non-REP, but as the interface that goes down isn't directly connected, REP doesn't recognize the topology change.
REP is only able to identify when the 'non-REP' link directly connected to the Edge switch goes down, and with the command "edge no-neighbor" will propagate this information to the REP ring. No way to detect failure behind this link.
Note: you should also activate the command "rep stcn tcp" in your design; it will send a TCN to the STP domain in case of failure in the REP Ring (because also the STP part of your ring should flush the MAC table).
loadbalancing is one of the more complex items in hardware forwarding. of course we have talked about it many years on cisco live (id 2904) with ever incrementing more detail. and there is the support forum article on loadbalancing.
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