Terminating Q-in-Q on WS-C3750G-24TS-S1U

Question

Hello,
we have a connection from a service provider between location A and B where in location A i have an ethernet port and i configure a switch interface as trunk with 802.1q encapsulation and i try to pass vlans 421-423. in location B the ethernet is presented in the form of a Q-in-Q trunk. So from what i understand the vlans i put in the trunk in location A are encapsulated inside what the service provider called svlan with the id 10. i have the following configuration of the ethernet port in location B:
interface GigabitEthernet2/0/25
 description Eircom_Fibre
 switchport access vlan 10
 switchport trunk encapsulation dot1q
 switchport mode dot1q-tunnel
 l2protocol-tunnel cdp
 l2protocol-tunnel stp
 l2protocol-tunnel vtp
 no cdp enable
now i was hoping i could simply configure another interface as .1q trunk and pass traffic on via a normal trunk instead of Q-in-Q. the interface for that is configured as follows:
interface GigabitEthernet2/0/1
 description Ceragon Payload
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 421,422
 switchport mode trunk
unfortunately i can not pass traffic. it seems the switch is not picking the vlans out of the svlan with the id 10. can anybody advise how i can access the vlans from within the q-in-q trunk ?
Kind Regards
Jan

Answer 1

Actually 12.2(25)SE and has this capability but needs to be turned on using the command "service unsupported-transceiver"
3750#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3750(config)#service unsupported-transceiver
Warning: When Cisco determines that a fault or defect can be traced to
the use of third-party transceivers installed by a customer or reseller,
then, at Cisco's discretion, Cisco may withhold support under warranty or
a Cisco support program. In the course of providing support for a Cisco
networking product Cisco may require that the end user install Cisco
transceivers if Cisco determines that removing third-party parts will
assist Cisco in diagnosing the cause of a support issue.
3750(config)#