!
system mtu 1546 ! Max for FE Interfaces
vlan dot1q tag native ! recommended for security
errdisable recovery cause l2ptguard ! if thresholds are set
!
interface
switchport access vlan
switchport mode dot1q-tunnel
l2protocol-tunnel
l2protocol-tunnel shutdown-threshold ! recomended for protection
l2protocol-tunnel drop-threshold !recommended for protection
!
Finally, if you set any of the port as Dot1q you must change the interface-type. This new in the ME series.
More details and configuration options are available at "Cisco ME 3400 Switch Software Configuration Guide"
http://www.cisco.com/univercd/cc/td/doc/product/metro/me3400/12244se/scg/index.htm
-W