| 摘要 |
Provided are a method, device and system for link switching, which relate to the field of communications, provide a link switching mechanism, and realize rapid linkage switching between inter-device links. The specific practice thereof is: transferring, by an optical network unit, a monitoring packet over a first link where the optical network unit and an aggregation side switching device are connected via a first maintenance entity port to monitor the first link; if it is monitored that a link failure occurs at the first link, then switching, by the optical network unit, a first sub-link of the first link to a first sub-link of a second link; sending, by the optical network unit, a notification message to a second optical line terminal, so that the second optical line terminal opens a transmission port; and sending, by the optical network unit, an automatic protection switching message over the second link via a second maintenance entity port to the aggregation side switching device, so that the aggregation side switching device switches a second sub-link of the first link to a second sub-link of the second link. The embodiments of the present invention are applied to the switching of communication links. |
