If you have protocols that cannot be routed you can use a bridge group.
If you want to extend a LAN over a point-to-point WAN link (without routing, which requires different IP Subnet) you can use a bridge group to "bridge" the traffic over the link to the remote location.
IP access-lists do not have effect on bridged traffic. In that case you need to use mac access-lists to prevent traffic from being forwarded. It is possible to both bridge and route traffic, to do this I recommend you to read the documention on transparent bridging, Integrated Routing and Bridging (IRB) and Concurrent Routing and Briding (CRB).
HTH
--Leon
