Multiple Bridge Groups on one Ethernet Port

[JurgenM]

Is this possible?
I have a Cisco 1700 router with one Ethenet and two serial ports. Bridging is a must. The serial ports are connected to two 512 K leased lines. When i enter Bridge Group 1 and Bridge Group 2 under the fastethernet i get an error message and my Serial1 is shut down administrative.

 

[routerman]

What error message do you get?

I didnt think you could configure multiple bridge groups unless the interface is using vlans, and I dont think this router supports this feature.