El router no tiene ningún comando ipsec, la version que tiene instalada (c1841-entservicesk9-mz.124-18).
ROUTER(config)#crypto ?
ca Certification authority
engine Enter a crypto engine configurable menu
key Long term key operations
pki Public Key components
provisioning Secure Device Provisioning
wui Crypto HTTP configuration interfaces
ROUTER(config)#crypto
Gracias
