What role to choose for cisco 2821?

Question

Cisco

There is a medium office (100 PCs, windows - AD, WSUS, WDU; centos - DHCP, zabbix; ESXi 5.1) and a remote warehouse (50 PCs). Everything is connected by perfectly working cisco 2921 and 1821. IPSec VPN is configured for remote access to resources, etc. They handle the load just fine. And here one more cisco 2811 from other enterprise got for nothing. What are the possible uses for such goodness within the current network structure?
*In working with cisco, he is not very hardened, only, approximately, within the framework of icnd (initial config, remote access, setting up interfaces, acl, etc.)
**The "sell / give away / throw away" option is not interesting.

Answer 1

Put in parallel with the current default gateway by configuring vrrp/hsrp. Report to superiors on the implementation of fault-tolerant technology.
Set as an unadvertised vpn server for personal remote access.
Use in the lab for inhuman experiments (compare in practice, for example, process switching, route cache and cef)