The last post on the topic of SDNs discussed BGP as a southbound interface to control policy. This form of SDN was once common in hyperscale data centers (though not as common as it once was). In our pursuit of out of the way (and hence interestingly different) forms of SDNs (hopefully this series will help you understand the scope and meaning of the concept of SDNs by examining both common and uncommon cases), it’s time to look at another unusual form of policy injection—Fibbing. In fibbing, a centralized controller engineers traffic flow in a link state network by interacting with the control plane directly, rather than interacting with the forwarding plane or the RIB. —ECI
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