The mode you are using Active/standby does support EIGRP with version 8 software.
Is EIGRP working on the acive ASA? The standby peer is not forwarding any traffic when in standby mode and will not form any EIGRP neighbour relationship. Based on your config you are using active/standby in a routed mode. Only one ASA isactive and the active ASA can form EIGRP neighbour relationship.
If you need configuration help with EIGRP routing on the ASA, let us know.
"In Version 8.4 and later, Stateful Failover participates in dynamic routing protocols, like OSPF and EIGRP, so routes that are learned through dynamic routing protocols on the active unit are maintained in a Routing Information Base (RIB) table on the standby unit. Upon a failover event, packets travel normally with minimal disruption to traffic because the Active secondary ASA initially has rules that mirror the primary ASA. Immediately after failover, the re-convergence timer starts on the newly Active unit. Then the epoch number for the RIB table increments. During re-convergence, OSPF and EIGRP routes become updated with a new epoch number. Once the timer is expired, stale route entries (determined by the epoch number) are removed from the table. The RIB then contains the newest routing protocol forwarding information on the newly Active unit."
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