03-05-2010 10:21 AM
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?
interface FastEthernet0/1.1
interface BVI1
ip address 10.24.205.1 255.255.255.0
end
Thanks
keith
03-26-2010 07:00 AM
Hello Keith,
what is the router platform and what IOS image is running on it?
some platforms support double vlan tag termination see like 10000
http://www.cisco.com/en/US/docs/routers/10000/10008/feature/guides/qinq.html
Hope to help
Giuseppe
04-06-2010 07:09 AM
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.
Thanks for your help.
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