I am trying to connect a router to a network that has double tagged ethernet (IP) packets. I have configured an ethernet subinterface to a bridge group and to the router via a BVI (see below). Double tagged packets are received from the network to the BVI but when a response is sent, it only has the outer tag and is ultimately dropped by the network. If I change the setup to use single tags it all works, or if I change the setup to an IP addressed subinterface, not going through the bridge group it works. I cannot find documentation on such a setup using double tag termination and bridge/BVI. Does IOS support this combination?
ip address 10.24.205.1 255.255.255.0