Load-balancing to Data Centers in a L3VPN environment based on Power

Document Type Expired Internet-Draft (individual)
Authors Balaji Venkataswami  , Bhargav Bhikkaji , Shankar Raman 
Last updated 2013-08-21 (latest revision 2013-02-17)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Data Centers may be spread across different locations for a particular enterprise. Different locations may mean within the same country but across different geographical locations, or outside the country even in a different continent. These data centers may be serving the enterprise or multiple enterprises / tenants wherein the regular enterprise site may request data from a data center site which could be one of the data center sites proximal to the enterprise site. Proximity is usually calculated based on a metric that is bandwidth driven or in terms with regard to the number of hops to reach that data center site hence bringing into play delay characteristics. Assume a topology where the data center sites and the enterprise sites are MPLS based L3VPN sites that are being provided connectivity through a Service Provider deploying Layer 3 VPNs. Given such a topology it is possible that replication of data happens across the data centers in a timely manner to keep the data active and refreshed across all data center sites. Suitable mechanisms for such replication will come into play for this purpose. Thus any of the data centers can cater to the request from a user site. It is possible that power consumption in each data center may vary according to the load on each data center. It would be prudent to introduce a scheme where the power metric coupled with other metrics such as bandwidth and delay be used by a Provider Edge router in a L3VPN scenario to direct the packets or requests from regular user sites to such data centers with the least such metric. This is in line with the follow-the-moon strategy of directing requests for data and compute to data centers which are power-wise more efficient during the night or during the day. This draft document lays out one such proposal.


Balaji Venkataswami (balaji_venkat_venkat@dell.com)
Bhargav Bhikkaji (bhargav_bhikkaji@dell.com)
Shankar Raman (mjsraman@cse.iitm.ac.in)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)