The link server trails for several sites disappeared on the U2000 V100R002C00. Without the link server trails, the SDH trails also disappeared but actual services were not affected. Therefore, users had to re-create each link server trail every time.
upgrade U2000 from V100R002C00 to V100R002C01CP0302 to avoid this problem.
Log analysis result concludes that an incorrect port attribute change event was reported to the cross-domain module, and the module deleted the related fiber. Such incorrect events may be reported when NEs report events frequently.