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dynamic mac address added all hosts through the Do1Q tunnel

hello, we have a nexus switch, we configure two customer ports in different switches with (mode Dot1Q tunnel)
as all traffic must have two VLAN tags, an inner tag, and an outer tag,
in our network, we defined only one VLAN (outer tag) to connect two ports of one customer (different location)
the customer has more than 1000 Host in his network, a
when I check the mac-address-table of my switch we notice all host's mac address of the customer is added to our mac-table
as do1q tunnel, we must only see one mac-address of edge customer Switch,
but why my switch add all mac-address of the host's customer to my mac-address-table
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