| 摘要 |
Embodiments of the present invention provide a method and device for label automatic allocation in ring network protection. The method includes: after physical topology configuration of ring network protection is completed, if connectivity detection between a first node and a downstream node of a ring tunnel is UP, receiving, by the first node, a first label distribution message sent by the downstream node, where the message includes: an identifier indicating that a tail node label is ready, and working tunnel label and a protection tunnel label allocated by the downstream node for the ring tunnel; sending, by the first node according to the identifier indicating that the tail node label is ready, a second label distribution message to the upstream node, where the message includes: the identifier indicating that the tail node label is ready, and a working tunnel label and a protection tunnel label allocated by the first node for the ring tunnel; so that the upstream node learns that label allocation for all nodes on the ring tunnel between the first node and a tail node is completed. The method solves problems in the prior art that a workload for configuration of a working ring is big and availability of an end-to-end service cannot be ensured. In one embodiment, the last 32 bytes of a meg id field in a continuity check message (CCM) according to ITU-T Y.1731 are extended. Alternatively, the foregoing fields, namely Type (8bits), Length (8bits), Node id (8bits), ring id (32bits), Working path in-label (20bits), Protection path in-label (20bits), and E bit (1 bit), are placed at the last part of the CCM. Optionally, a loopback message LBM according to Y.1731 may be used for label distribution. |
