| 摘要 |
Disclosed are a path protection method and system. The method comprises: constituting N protection group at an ODUK layer with a working path and N protection paths, wherein the nth protection group contains a path nesting an (n-1)th protection group and a protection path without any other protection group joining in, 2≤n≤N-1; according to a sequence of the values of n from small to large, setting a holdoff time corresponding to each protection group from small to large; when the nth protection group detects an alarm signal sent out by any one of the first to the (n-1)th protection groups, starting countdown of the holdoff time of the nth protection group; after the countdown is finished, detecting whether the alarm signal still exists; and when the alarm signal can still be detected, performing switching from the path nesting the (n-1)th protection group to the protection path in the nth protection group. |
