MAC-based redistribution policy for multi-area networks
Provided herein are systems and methods for providing a MAC-based redistribution policy between networks in a multi-area network. A network can have a boundary node that communicates to neighboring networks. Boundary nodes can receive policy updates that identify which services are redistributable across network boundaries. Boundary nodes can receive a packet for a service, translate the packet's encapsulation, and forward the packet across the boundary towards a destination node. Boundary nodes can forward the packet such that it originates in the second network from a virtual node.
1. A method for redistributing services at a boundary between a first network and a second network of a multi-area network, the method comprising:
receiving, at a boundary node or at a virtual node on the boundary and from a first node in the first network, a packet for a service, wherein the packet is encapsulated in a first encapsulation, wherein the first encapsulation comprises a first source address of the first node and a destination address based on the first node and a service instance identifier (I-SID) of the service, and wherein the virtual node is in the second network and represents the first network to the second network;
translating, at the boundary node or the virtual node, the packet from the first encapsulation to a second encapsulation, wherein the translating comprises:
changing the first source address to a second source address of the boundary node or the virtual node; and
updating the destination address based on the second source address and the I-SID for the service; and
forwarding, from the boundary node, the packet to a second node in the second network.
2. The method of claim 1 , further comprising pointing, by the boundary node, a first media access control (MAC) address for the service to the first node in the first network.
3. The method of claim 2 , further comprising synchronizing, by the boundary node, a second MAC address for the service in the first network with the first MAC address.
4. The method of claim 1 , further comprising:
receiving, at the boundary node, a policy update from a control plane configured to enable the service to be redistributable between the first network and the second network.
5. The method of claim 1 , wherein the first encapsulation further comprises:
a boundary value identifier for the boundary node; and
the I-SID.
6. The method of claim 1 , wherein the second encapsulation comprises:
the second source address of the virtual node;
the updated destination address;
a boundary value identifier for a second node on the boundary; and
the I-SID.
7. The method of claim 6 , wherein forwarding the packet from the boundary node to the second node further comprises forwarding the packet from the boundary node with the virtual node as a root.
8. The method of claim 6 , wherein the second node is a second boundary node in the second network on another boundary between the second network and a third network in the multi-area network.
9. The method of claim 8 , further comprising forwarding, from the second node, the packet to the updated destination address, wherein the updated destination address is associated with a third node in the third network.
10. A boundary node on a boundary between a first network and a second network in a multi-area network, the boundary node comprising:
a memory; and
a processor communicatively coupled to the memory and configured to:
receive, from a first node in the first network, a packet for a service, wherein the packet is encapsulated in a first encapsulation, and wherein the first encapsulation comprises a first source address of the first node and a destination address based on the first node and a service instance identifier (I-SID) of the service;
translate the packet from the first encapsulation to a second encapsulation, wherein to translate the packet the processor is further configured to:
change the first source address to a second source address of the boundary node; and
update the destination address based on the second source address and the I-SID for the service; and
forward the packet to a destination node in the second network.
11. The boundary node of claim 10 , wherein the processor is further configured to point a first media access control (MAC) address for the service to the first node in the first network.
12. The boundary node of claim 11 , wherein the processor is further configured to synchronize a second MAC address for the service in the first network with the first MAC address.
13. The boundary node of claim 10 , wherein the processor is further configured to receive a policy update from a control plane configured to enable the service to be redistributable between the first network and the second network.
14. The boundary node of claim 10 , wherein the first encapsulation further comprises:
a boundary value identifier for the boundary node.
15. The boundary node of claim 10 , wherein the second encapsulation comprises:
the second source address of a virtual node, wherein the virtual node is in the second network and represents the first network to the second network;
the I-SID of the service;
the updated destination address; and
a boundary value identifier for a node on the boundary.
16. The boundary node of claim 15 , wherein the processor is further configured to forward the packet from the boundary node to the second network with the virtual node as a root.
17. The boundary node of claim 15 , wherein the destination node is a second boundary node in the second network on another boundary between the second network and a third network in the multi-area network.
18. A non-transitory computer readable storage medium having computer readable code thereon, the non-transitory computer readable storage medium including instructions configured to cause a computer system to perform operations, comprising:
receiving, at a boundary node or a virtual node and from a first node of a first network, a packet for a service, wherein the boundary node is on a boundary between the first network and a second network of a multi-area network, wherein the packet is encapsulated in a first encapsulation, wherein the first encapsulation comprises a first source address of the first node and a destination address based on the first node and a service instance identifier (I-SID) of the service, and wherein the virtual node is in the second network and represents the first network to the second network;
translating, at the boundary node or the virtual node, the packet from the first encapsulation to a second encapsulation at the boundary node, wherein the translating comprises:
changing the first source address to a second source address of the boundary node or the virtual node; and
updating the destination address based on the second source address and the I-SID for the service; and
forwarding the packet from the boundary node to a second node in the second network.
19. The non-transitory computer readable storage medium of claim 18 , the operations further comprising:
pointing, by the boundary node, a first media access control (MAC) address for the service to the first node in the first network; and
synchronizing, by the boundary node, a second MAC address for the service in the first network with the first MAC address.
20. The non-transitory computer readable storage medium of claim 18 , the operations further comprising:
forwarding the packet from the boundary node to the second node with the virtual node as a root, wherein the second encapsulation comprises:
the second source address of the virtual node,
the I-SID of the service,
the updated destination address, and
a boundary value identifier for a third node on the boundary.