ASA Compatible with EIGRP Version 3
Many of you may be aware that EIGRP support for the ASA was added in 8.0(2). In fact there is a very nice, easy to follow tech note detailing how to enable EIGRP on your ASA listed here: EIGRP Tech Note. However, if you upgrade from 8.0(2) to 8.0(3) due to a packet format change, Version 8.0(3) and later are not compatible with Version 8.0(2). Therefore, if you upgrade an adaptive security appliance to Version 8.0(3) or later, and it is peering with another adaptive security appliance running Version 8.0(2), then the peer must also be upgraded, or EIGRP will not operate correctly.

Comment by priyant
on 25 July 2008:
Any good explanation ?? is there BIG difference between ASA and IOS security ? Why to implement Firewall if router can work as Firewall with security IOS