http://dl.fedoraproject.org/pub/epel/6/x86_64/

yum install flow-tools


router(config)#interface FastEthernet 0/1
router(config-if)#ip route-cache flow
router(config-if)#ip flow {ingress | egress}
router(config)#ip flow-export destination 192.168.9.101 2055
router(config)#ip flow-export source Loopback 0
router(config)#ip flow-export version 5
router(config)#ip flow-cache timeout active 5
router(config)#ip flow-cache timeout inactive 15