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?
In my lab the equipment is a Cisco IOS Software, 2800 Software with Version 12.4(24)T
In the large lab (same equipment as field), the issue is seen on a 7206 VXR also with 12.4.
In both cases, if the bridge group is removed and q-in-q terminates at the layer 3 interface (the GigE), it works fine. When the bridge group is added and the layer 3 is provided by the BVI, the problem occurs.
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