VPLS N-PE redundancy with STP isolation

摘要

In one embodiment, a system includes a first network, a second network, and a core network connecting the first network to the second network. The first network includes a first set of two or more network devices, wherein the first network has a first spanning tree associated therewith. Similarly, the second network includes a second set of two or more network devices, wherein the second network has a second spanning tree associated therewith, wherein the second spanning tree is separate from the first spanning tree.

主权项

1. A system comprising:
a first computer network including a first plurality of network devices, wherein the first computer network has a first spanning tree associated therewith; a second computer network including a second plurality of network devices, wherein the second computer network has a second spanning tree associated therewith, wherein the second spanning tree is separate from the first spanning tree; wherein a core network connects the first computer network to the second computer network; wherein a first network device of the first computer network is connected to a second network device of the first computer network over an inter-device link, wherein traffic to and from the core network cannot be transmitted on the inter-device link; and wherein the first and second network devices are configured to:
set, by the first network device, a primary semaphore associated with the first network device to an inactive state in response to a failure of the first network device;send, by the first network device, a first packet to the second network device via the inter-device link indicating that the the first network device is down in response to the failure of the first network device;set up, by the second network device, a second connection port connecting the second network device to the core network in response to receiving the first packet, thereby permitting traffic to and from the core network to be forwarded via the second network device;set, by the second network device, a backup semaphore associated with the second network device to an active state in response to receiving the first packet; send, by the second network device, a second packet to the first network device via the inter-device link indicating that the second network device is in the active state; and
force down, by the first network device, a first connection port connecting the first network device to the core network in response to receiving the second packet, thereby blocking traffic to and from the core network via the first network device.