I trying configure QinQ on Arista DCS-7050QX-32-F, eos version is 4.20.7m.
Network topology is placed in attachment.
Arista DCS-7050S-64-F config:
I can’t ping vlan4010 on Arista DCS-7050S-64F from my PC, but I see correct mac addresses on vlan 4020:
ARP-table on Arista 7050S:
ARP-table on PC:
What’s wrong? Why doesn’t it work? Help me please
Does SNR another vender? I think you should confirm what ether-type they are using.
It appears the SNR switch is the beginning of the Q-in-Q tunnel and the Arista 7050S is not involved with terminating the tunnel. The 7050S will see all traffic within VLAN 4020 and does not know about 4010.
I am not sure where you want the tunnel to terminate, but you will need it to decapsulate the S-tag before the Arista has access to C-tags.
I have drawn a diagram that is perhaps not exactly what you want, but it shows how you can pass traffic through a switch and then decap/terminate the tunnel and pass the inner VLANs (C-tags) to another switch.
Essentially you treat the already tagged traffic as if it's in the S-tagged VLAN and you can trunk it through without knowledge of the q-in-q tagging. The tunnel is terminated wherever the interface is in mode dot1q-tunnel and you set the access VLAN to that of the S-tag, being stripped or added, depending on direction.
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