Cisco VPN :: Configure IPsec Stateful Failover On 891?

Sep 15, 2011

We have purchased a couple of Cisco 891 routers - both are running IOS 15.0(1) M5 licensed with advanced IP services (default). The literature for these devices on Cisco's website claims they support IPsec stateful failover on advanced IP services.
 
Our intention is to configure them with HSRP and IPsec stateful failover to provide a highly-available default gateway and VPN end-point.
 
I have configured HSRP and that seems to work fine. My problem is that I cannot configure IPsec stateful failover. The documentation that I have found implies that I need to configure inter-device redundancy on a particular HSRP group and use the physical IP addresses on the interfaces within that group to allow stateful failover communication between the routers however the routers do not recognise the 'redundancy' command in config mode...
 
e.g.
 
(config)# redundancy inter-device
^
% Invalid input detected at '^' marker.

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[code].....

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: Saved
 :
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[code]....

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