I was doing some basic MPLS VPN guided by the below document, but I couldn't get it to work because i was using a 2691 and its interfaces do not have tag-switching or ip mpls command available on it. Nevertheless, i finally just enabled ip vrf forwarding siteA on all the interfaces including the L0 and got it to work. Just wanted to know if the solution is acceptable. Thanks.
Can you give us hint on your setup. If you have similar setup as given in your refference URL then you should be running Mp-BGP for VPN routes exchange and IGP for Edge & Core reachability. And you should have enabled tag-switching ip in your backbone, If this is the case, then it shoudn't work (Edge PE- IP's label would be seen as untagged in BB (since interface connecting to edge PE is not mpls enabled) so it will try to lookup the VPN prefix info in BB itself. I can get clear picture if you could provide the n/w diagram
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