If each WAN port is getting its own public IP, I don't see why this wouldn't work. Its not truly redundant, but it should work for aggregation. I have a an MX84 that is ultimately doing something theoretically similar, but not for the purpose of aggregation. The MX can do "private IP" routing on the LAN ports (like to an MPLS router for example), so if you don't need inspection and NAT, that could possibly be an option too. To my knowledge the default 0.0.0.0 has to go through the WAN ports though. T-800
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