Intelligent route distribution to avoid routing asymmetry during graceful restart in software-defined networks

A system associated with a hub node that facilitates communications between a first network and a second network, the system comprising:

• one or more processors;
• and one or more non-transitory computer-readable media storing instructions that, when executed by the one or more processors, cause the hub node to perform operations comprising:
• receiving a route associated with an edge node in the first network;
• distributing the route including a first metric to the second network, wherein the first metric is associated with an internet protocol (IP) routing protocol that is in use in the second network;
• determining that a connection between the hub node and a network controller associated with the hub node has been lost;
• marking, based at least in part on determining that the connection between the hub node and the network controller has been lost, the route as stale;
• and distributing the route including a second metric to the second network, wherein the second metric is based at least in part on marking the route as stale.

One or more non-transitory computer-readable media storing instructions that, when executed, cause one or more processors to perform operations comprising:

• receiving, at a first hub node that facilitates communications between a first network and a second network, a route associated with an edge node in the first network;
• distributing, by the first hub node, the route including a first metric to the second network, wherein the first metric is associated with an internet protocol (IP) routing protocol that is in use in the second network;
• determining, by the first hub node, that a connection between the first hub node and a network controller associated with the first hub node has been lost;
• marking, by the first hub node and based at least in part on determining that the connection between the first hub node and the network controller has been lost, the route as stale;
• and distributing, by the first hub node, the route including a second metric to the second network, wherein the second metric is based at least in part on marking the route as stale.