apply the service policy to interface vlan 12, not the layer 2 switchport interface GigabitEthernet1/0/5.This should work.also to ratelimit egress traffic use the srr-queue bandwidth shape command. You can't do a service policy output on the 3550/375...
do a show ver(look at Processor board ID) this is also chassis id.see belowcisco 1841 (revision 5.0) with 118784K/12288K bytes of memory.Processor board ID FTX0920Y00Z2 FastEthernet interfaces1 Virtual Private Network (VPN) ModuleDRAM configuration i...