Having a lot of trouble with this...even with Advanced Services helping. We are trying to put a guest anchor controller out off of a active/standby 5555-X pair, with a SourceFire 7150 appliance (TAP mode, just passing traffic) between. TAC and AS suggested to put it in LAG mode, build a port channel with a single member on the ASA. Its really weird, I can ping from one of our cores, but not the other.
Show monitor-interface shows that failed (waiting) on the new interface. If you get on the standby ASA, you can ping the secondary address...but not the primary and vice versa.
Any advice?