Rules:
1) Can belong to any area including area 0
2) Sham Link end points cannot be advertised by OSPF
steps on PE:
1) Create a New Loopback and put it in vrf
2) Advertise the loopback in MPBGP
3) Create a sham-link
4) Ensure the OPSF cost on the backdoor link is high so that traffic prefers MPLS link.
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