SHAM-LINK

i have done a basic MPLS VPN and i m running ospf on both the sides of the the topolgy.i tried ospf sham link...but the problem is,the link is flapping...it will come up and stay for another 10 sec and goes down...PLEASE help me to get past this......
and also please suggest me how to learn the fundemantals of ATM networking....i dont know how to learn ATM technology...Please help me on this....

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