Hello, I have sites with multiple VPN's and I think I understand what you are trying to accomplish. You want all traffic to go down TunnelA as primary with TunnelB as secondary? If yes, setup the tunnels the same with settings on both. Both tunnels will be up at the same time, this is OK. Then control traffic with routing, either static routes with monitors and weights or OSPF with Metrics. Hope that helps.
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