found this link that helped
Thanks
http://7200emu.hacki.at/viewtopic.php?t=4880
- console s1, configure hostname, copy run flash: (with erasing flash:), write memory, stop s1, exit dynagen
- start dynagen, console s1, sh flash: (s1-config is still there)
- vlan database
- vlan 100 name blafasel
- apply
- exit
- sh flash (vlan.dat with 660 bytes), stop s1, exit dynagen
- start dynagen, console s1, sh flash (vlan.dat still has 660 bytes)
- vlan database
- sh current (vlan 100 is still there)
- vlan 200 name foobar
- apply
- exit
- sh flash (vlan.dat with 660 bytes marked deleted and vlan.dat with 720 bytes)
- stop s1, exit dynagen
- start dynagen, console s1
- int f0/0, switchport access 100, no shutdown
- sh vlan-switch: