| CPC H04L 1/24 (2013.01) [H04L 41/0654 (2013.01); H04L 41/0686 (2013.01); H04L 41/0893 (2013.01)] | 25 Claims |

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1. A method, comprising:
determining, by a first device, a fault status of R receiving logical lances of the first device;
determining, by the first device, N alignment marker (AM) groups, wherein each of the N AM groups includes M pieces of alignment marker group lane (AMGL) information, and at least part of the M pieces of AMGL information includes first indication information indicating the fault status of the R receiving logical lances of the first device; and
sending, by the first device in an ith period of N periods, respectively, M pieces of AMGL information included in an ith AM group, to a second device over M transmitting logical lanes, the N periods being in a one-to-one correspondence with the N AM groups, the N AM groups being sent to the second device in the respective N periods, wherein M, N, and R are positive integers, and i is a positive integer greater than 0 and less than or equal to N.
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