I have a need for out-of-the-box setup.
I need my ASA5520 and Cisco 2821 router to peer via HSRP.
The ASA5520 should always be ACTIVE and processing ALL traffic unless the ASA5520 is down (determined via IP SLA, BOOLEAN logic) and then the router becomes the active peer.
Anytime the HSRP peer router is active, the router should forward traffic to the backup site.
The backup site will have the same setup as primary so both sites can be active/active full time.
Asymetric routing issue will not be an issue in this specific case but thanks for thinking about this issue too.
FYI, I have pasted this in Routing and switching fourm too.
The firewall cannot participate in HSRP. In order to achieve what you are
looking for, the best approach in my opinion is to configure the router as
default gateway for your network. On the router you can configure a floating
default route pointing to the ASA and have another default route that points
to the remote site. You can track connectivity to ASA's default gateway
through IP SLA. So, if the ASA goes down the object tracking will force the
router to remove the floating static route and send all traffic to remote
Hope this helps.