You may want to try the <interface0/0> #ip route-cach flow command for your 6500/7600--it is the older command version of the #ip flow ingress command.
Since the 12406 is a router and not a switch, it will not have the same Netflow commands. See Configuring Netflow on Cisco IOS XR Software for more information.
Also, Re: Are all Cisco products using the same CLI configuration to enable NetFlow? is a good reference thread.