Hi Anil,
What you are looking to achieve exactly?
In general when the link at DC goes down the IP's which learning over the link will be unreachable.
If you want access the applications on the same IP from DR when DC fails then You might need to coordinate with your service provider at DC and then they may provide the link to your DR and advertise the same subnet what you have at DC.
HTH
Please click on the correct answer if this answered your question.
Regards,
Naidu.