Currently, I'm trying to implement VPN L2TP in packet tracer for my assignment in college. I plan to make a simple topology of it, with some PCs and some routers as LAC & LNS. I've been reading any documentations regarding the concept and configuration of VPN L2TP at cisco.com. When I try to do the configuration in routers, only vpdn enable and vpdn-group exist. While in the documentation, there are other vpdn commands such as vpdn search-order, vdpn authen-before-forward and any other vpdn commands aside from those two I mentioned before. They are somehow unrecognized in my devices.
Please help me, I desperately need any assistances or suggestions that might be possible for my current situation.