Core switches between 2 data centers

Existing data center has 2 X Cisco 6500 series core switches, new data center has 2 X Cisco nexus core switches. For the connection between 2 data center, it will be using leased line. To establish the network connection for both side, should it use trunk port with layer 2 connection directly or layer 3 ip routing (configure the ip on switchport interface) ? What is the better approach for its design? Please share your idea.

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The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
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Normally, when dealing with off-site traffic, L3 is better as it limits traffic to only what needs to go off-site.
However, as you're dealing with data centers, it's no longer uncommon that there's need to share L2 between them.  So, much depends on what your needs are.

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    The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
    Liability Disclaimer
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