hi,
yes, your 2900 can do IKEv2 if you already have the security license installed.
Technology Package License Information for Module:'c2900'
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Technology Technology-package Technology-package
Current Type Next reboot
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ipbase ipbasek9 Permanent ipbasek9
security securityk9 Permanent securityk9
uc uck9 Permanent uck9
data None None None
2911(config)#crypto ?
call Configure Crypto Call Admission Control
ctcp Configure cTCP encapsulation
dynamic-map Specify a dynamic crypto map template
engine Enter a crypto engine configurable menu
gdoi Configure GDOI policy
identity Enter a crypto identity list
ikev2 Configure IKEv2 Options
ipsec Configure IPSEC policy
isakmp Configure ISAKMP policy
key Long term key operations
keyring Key ring commands
logging logging messages
map Enter a crypto map
mib Configure Crypto-related MIB Parameters
pki Public Key components
provisioning Secure Device Provisioning
vpn Configure crypto vpn commands
wui Crypto HTTP configuration interfaces
xauth X-Auth parameters