I have the following scenario, please refer to the attachement.
There are basically 2 links from each site.
Site A - One active link is to ISP1 and the other link is a standby to ISP2.
Site B - One active link is to ISP2 and the other link is a standby to ISP1.
This topology is also replicated at sites C,D.
I am not really sure about the bgp config between the CEs and the PEs.
Any suggestions is very much appreciated.