Fast re-route for optical networks

摘要

An optical network device re-routes traffic from a path to a backup path in response to determining that a downstream segment of the primary path is not operational. The optical network device receives traffic on a slot of an optical fiber. For each data unit in the traffic, the optical network device determines, based on receiving the data unit on the slot and based on a flow identifier specified in the data unit, that a given path is associated with the data unit. If a downstream segment of the given path is not operational, the optical network device routes the data unit onto a backup path instead of routing the data unit along the given path. Bandwidth is not reserved for the backup path.

主权项

1. A method comprising:
receiving, at an optical network device, traffic on a physical slot of a first optical fiber, the first optical fiber connected to a first port of the optical network device, the traffic including a given data unit; determining, based on the given data unit being received by the optical network device on the physical slot of the first optical fiber and based on a flow identifier specified by the given data unit, that the given data unit is associated with a first path; determining whether a downstream segment of the first path is operational; and in response to determining that the downstream segment of the first path is not operational:
identifying a virtual slot of a second optical fiber that is connected to the optical network device, the virtual slot of the second optical fiber reserved for a second path, wherein reserving virtual slots for a path does not reserve bandwidth associated with physical slots corresponding to the virtual slots;identifying, based on the virtual slot of the second optical fiber, a physical slot of the second optical fiber; andforwarding the given data unit on the physical slot of the second optical fiber.