Triple Transparent Bridge HA Configuration Issues

[evanescingdreamer]

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With the configuration in the diagram, the logs are showing the hardware interface for the bridge swapping between the member interfaces consistently. Each modem and equivalent bridge uplink interfaces are connected to their own, private vlan that is not trunked through the switch's uplink port, yet it causes my VPC on the parent switches to die. I enabled RSTP on each of the bridge interfaces and that has not resolved the issue. The modem->bridge->router switches are Ubiquity, while the core switches are Cisco Nexus.

Removing the switches and connecting everything directly resolves the issue; however, it removes my ability for HA.

I'd really like for this to work. The ISP requires me to run their router in order to leverage my static IPs, but I want a bit more control over security. Each of the bridge servers take 10-15 minutes to reboot after an update which is why I want one to be online while updating the other.

My next step would be to remove the switch uplinks to the core switches and make them standalone, but I would like to avoid this in the long run for management.