As networks are constantly upgraded to high speed and high capacity

it has become a problem demanding prompt solution to adaptively avoid physical layer impairment in the routing process.To this solution

the perception and retention of the impairment information is the key.This paper sets up an information characterization table for the distributed Physical Layer Impairment-aware Database（PLID） by analyzing the physical-layer impairment parameters

makes reference to the traffic engineering database standard protocol and expands the OSPF-TE protocol in it so as to establish and update the PLID.It is found that when the control overheads for different modes of update for the database are compared

threshold-based update is more suitable as it can satisfy the requirements of different QoS for the quality of channel transmissions at different wavelengths.