What is the equilvalent command on FWSM 4.0(3) to perform "inspect ipsec-pass-thru" on ASA?

I have a 3845 connecting to a 2811 through GRE tunnel. The GRE tunnel from the 3845 will pass through a ASA5520 to encrypt the GRE tunnel into an IPSec tunnel terminated on the 2811.Occassionally, there is a drop to the tunnel interface independent ...

I have a C2950SX-48-SI running Version 12.1(22)EA4.Data sheet shows it support PVLAN.When I try to setup PVLAN with the switch, it gives me errors:Unimplemented Function: pm_platform_vlan_set_pvlan_typeUnimplemented Function: pm_platform_vlan_set_pvl...