Currently I am doing migration for a customer, I am deploying/modifying two ASAs in parallel (for simplicity: two ASAa have same vlans for inside and outside interfecs, respectively). The inside interfaces are connected to two core switches 6513 (configured EIGRP). The outside interfaces link to edge route ASR1002.
Question: in most situations, two ASAs are doing active/standby failover. Now because my customer network has a block of public addresses /16. I am going to use EIGRP routing for both ASAs, in this case loading balancing (equal cost). Is there any possiblity of packet droping for return traffic? Say: return traffic will be dropped on one ASA because outgoing traffic is leaving through another ASA: stateful connection table is not properly built (built on asa not on the other?).