Auto-port aggregation behaviour

[Enrico Venturi]

Hello colleagues,
in our system we use a proprietary OSI stack wich directly connects to the LAN port by using the NM Id (or PPA);
We'd like to use the APA (Auto Port Aggregation) software to have LAN card redundancy at least from the IP standpoint;
my question is:
does the APA provide PPA virtualization (one PPA / NMId for two interfaces) or when a fault occur I have to redirect the stack to the new active board?

thanks
Enrico