Context specific keys

1. A method for operating a network, comprising:

segmenting the network into a plurality of virtual private networks, wherein each virtual private network runs on an underlying physical network, and wherein each virtual private network represents a particular context; and

configuring a node within the network to send and receive traffic based on context, comprising:

receiving a first encryption key associated with a first virtual private network of the plurality of virtual private networks from the node after the node generates the first encryption key;

receiving a second encryption key associated with a second virtual private network of the plurality of virtual private networks from the given node of the at least some nodes that generated the second encryption key, the second encryption key different from the first encryption key; and

communicating the first and the second encryption keys to a node in the network different from the given node.

2. The method of claim 1 , wherein each context is selected from a group consisting of an application, a department, and a specific topology.

3. The method of claim 1 , wherein the network is operated based on a control plane and a forwarding plane.

4. The method of claim 3 , wherein configuration of a context is based on one or more policies distributed to individual endpoints in the network by a controller for the control plane.

5. The method of claim 4 , wherein each endpoint comprises multiple contexts.

6. The method of claim 1 , when the first and the second encryption keys are distributed to other nodes in the network using the control plane.

7. The method of claim 1 , wherein configuring the node comprises configuring the node to perform an egress forwarding operation wherein only a packet for which there is a destination IP address associated with a source context identified in the packet is forwarded.

8. The method of claim 7 , wherein configuring the node comprises configuring the node to perform an ingress forwarding operation wherein only a packet for which there is a destination 1P address associated with a destination context identified in the packet is forwarded.

9. The method of claim 8 , wherein the source context and destination context are stored locally within each edge node in the network.

10. One or more non-transitory computer-readable media containing instructions which, in response to being executed by one or more processors, cause a system to perform operations comprising:

segment the network into a plurality of virtual private networks, wherein each virtual private network runs on an underlying physical network, and wherein each virtual private network represents a particular context; and

configure a node within the network to send and receive traffic based on context, comprising:

receive a first encryption key associated with a first virtual private network of the plurality of virtual private networks from the node after the node generates the first encryption key;

receive a second encryption key associated with a second virtual private network of the plurality of virtual private networks from the given node of the at least some nodes that generated the second encryption key, the second encryption key different from the first encryption key; and

communicate the first and the second encryption keys to a node in the network different from the given node.

11. The computer-readable media of claim 10 , wherein each context is selected from a group consisting of an application, a department, and a specific topology.

12. The computer-readable media of claim 10 , wherein the network is operated based on a control plane and a forwarding plane.

13. The computer-readable media of claim 12 , wherein configuration of a context is based on one or more policies distributed to individual endpoints in the network by a controller for the control plane.

14. The computer-readable media of claim 13 , wherein each endpoint comprises multiple contexts.

15. The computer-readable media of claim 10 , when the first and the second encryption keys are distributed to other nodes in the network using the control plane.

16. The computer-readable media of claim 10 , wherein configuring the node comprises configuring the node to perform an egress forwarding operation wherein only a packet for which there is a destination IP address associated with a source context identified in the packet is forwarded.

17. The computer-readable media of claim 16 , wherein configuring the node comprises configuring the node to perform an ingress forwarding operation wherein only a packet for which there is a destination 1P address associated with a destination context identified in the packet is forwarded.

18. The computer-readable media of claim 17 , wherein the source context and the destination context are stored locally within a given edge node in the network.

19. A system comprising:

a node in a network, the node configured to communicate with a first virtual private network and a second virtual private network; and

a control device configured to perform operations, the operations comprising:

segment the network into the first and second virtual private networks, wherein each virtual private network runs on an underlying physical network, and wherein each virtual private network represents a particular context; and

configure the node to send and receive traffic based on context, comprising:

receive a first encryption key associated with the first virtual private network from the node after the node generates the first encryption key;

receive a second encryption key associated with the second virtual private network from the node after the node generates the second encryption key, the second encryption key different from the first encryption key; and

communicating the first and the second encryption keys to a node in the network different from the given node.