http://www.cisco.com/c/en/us/solutions/service-provider/visual-networking-index-vni/index.html

1. How Do These Traffic Types Contribute
to the Overall Data Center Traffic?
14%
77%
9%
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By 2020, traffic between
data centers and end
users will reach 2.2 ZB
annually (14% of total
data center traffic).
1.4 ZB (9%) will come
from traffic between
data centers, such as
replication and
interdatabase links.
But the vast majority of data center traffic, 11.7 ZB (77%), will
still be coming from within the data center, such as storage,
production, development, and authentication traffic.