Automated route propagation among networks attached to scalable virtual traffic hubs

A method, comprising:

• performing, at one or more computing devices:
• determining that at least a first entry of a first routing table of a first isolated network programmatically attached to a virtual traffic hub is to be represented in a second routing table of a second isolated network programmatically attached to the virtual traffic hub to enable network packets originating at one or more resources of the second isolated network to be transmitted via the virtual traffic hub to one or more resources of the first isolated network;
• causing a new entry to be included in the second routing table that corresponds to the first entry of the first routing table;
• and
• implementing, at a first node of the virtual traffic hub, a routing action identified at a second node of the virtual traffic hub, resulting in a transmission of contents of a network packet originating at the one or more resources of the second isolated network to the one or more resources of the first isolated network, wherein the routing action is identified using an entry added to the second routing table.

Non-transitory computer-accessible storage media storing program instructions that when executed on one or more processors cause one or more computer systems to:

• store metadata indicating that a virtual traffic hub enabling connectivity between a plurality of isolated networks has been established;
• determine that at least a first entry of a first routing table of a first isolated network programmatically attached to the virtual traffic hub is to be represented in a second routing table of a second isolated network programmatically attached to the virtual traffic hub to enable network packets originating at one or more resources of the second isolated network to be transmitted via the virtual traffic hub to one or more resources of the first isolated network;
• and
• cause a new entry corresponding to the first entry of the first routing table to be included in the second routing table, wherein the new entry in the second routing table enables the network packets originating at the one or more resources of the second isolated network to be transmitted via the virtual traffic hub to the one or more resources of the first isolated network.