[c-nsp] Unable to transmit tagged frames over q-in-q tunnel

[Gökhan Gümüş]

Dear folks,

I have an issue with one of our customer service.

                                Gi0/5
Gi0/27
Gi5/13                                      Fa3/13
Customer SW ---------------- Customer Edge Switch-A ----------------PE1
----------MPLS Core --------------PE 2--------------Customer Edge Switch-B
--------------Customer SW

I am using q-in-q tunneling to enable customer traffic. Before, customer
port on Customer SW facing our edge switch was in ACCESS mode and it was
working.
Now they have decided to configure this interface as a TRUNK to transmit
multiple VLANs over the trunk. But they can not.
Currently ports are configured as trunk and customer can only transmit
traffic when they do not tag frames ( native-vlan config )

For note, i am not using " vlan dot1q tag native " command which is also
double-tagging native vlans.
MTU is fine and above 1504 bytes.

Please see our configs on Customer Edge Switch below;


*Customer Edge Switch A;*

A#sh run interface Gigabit Ethernet0/5
Building configuration...

Current configuration : 337 bytes
!
interface GigabitEthernet0/5
 switchport access vlan 1106
 switchport mode dot1q-tunnel
 switchport nonegotiate
 load-interval 60
 speed 100
 duplex full
 l2protocol-tunnel cdp
 l2protocol-tunnel stp
 l2protocol-tunnel vtp
 no cdp enable
end

A#sh run interface GigabitEthernet0/27
Building configuration...

Current configuration : 251 bytes
!
interface GigabitEthernet0/27
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,9,1101,1102,1106
 switchport mode trunk
 switchport nonegotiate
end

---------------------------------------------------------------------------------

*Customer Edge Switch B;*

B#sh run interface fa3/13
Building configuration...

Current configuration : 366 bytes
!
interface FastEthernet3/13
 mtu 2000
 load-interval 60
 switchport
 switchport access vlan 1106
 switchport mode dot1q-tunnel
 switchport nonegotiate
 l2protocol-tunnel cdp
 l2protocol-tunnel stp
 l2protocol-tunnel vtp
 no cdp enable
 spanning-tree bpdufilter enable
end

B#sh run interface gi5/13
Building configuration...

Current configuration : 298 bytes
!
interface GigabitEthernet5/13
 mtu 2000
 load-interval 30
 speed nonegotiate
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1101,1102,1106
 switchport mode trunk
 no cdp enable
end


Is there anybody who had such issue before?

Thanks and regards,
Gokhan Gumus