We are using a Nexus 93240YC-FX2 running 9.2(2) with two interfaces - each connected to a service provider NNI circuit. The traffic on these NNIs is being passed transparently from one to the other. The traffic is Q-in-Q on each side, but we do not want to modify the tags - just send it back out on the other NNI using the outer tag while leaving the inner tag untouched.
On the interfaces, we have configured
switchport mode trunk
switchport trunk allow-multi-tag
spanning-tree bpdufilter enable
mtu 9216
If the outer VLAN ID is configured on the switch and allowed on both trunks, is there any reason that this basic configuration would not allow the traffic to pass transparently, leaving both the inner and outer tags to be sent as received?
We seem to be having an issue that the far end is not responding to ARP for an SVI on the VLAN of the inner tag, but that device is beyond our management.
I have taken packet captures using ethanalyzer and it does seem to be forwarding with both VLAN tags intact.
Are there any other configurations required to allow this traffic to pass?
Is system dot1q-tunnel transit required to just pass between two trunks?
