The fallback mechanism is still being discussed, but if a ProxyPort link goes down, then it should trigger this fallback mechanism, but in this case, it might just temporarily fallback to mef_eline flows and then revert again if the EVC is up and ProxyPorts are UP too. The requirement is still being refined on https://github.com/kytos-ng/kytos/pull/402/files
The fallback mechanism is still being discussed, but if a ProxyPort link goes down, then it should trigger this fallback mechanism, but in this case, it might just temporarily fallback to mef_eline flows and then revert again if the EVC is up and ProxyPorts are UP too. The requirement is still being refined on https://github.com/kytos-ng/kytos/pull/402/files