However, these markers have their own limitations in resolving the geographical differentiation of population, especially when using few genetic markers. Įarly studies relating to genetic diversity, population genetic structure and gene flow studies have largely relied on traditional molecular markers (Random Amplified Polymorphism DNA, Simple Sequence Repeats, Amplified Fragment Length Polymorphism, Restriction Fragment Length Polymorphism and so on). Some research have shown that gene flow among populations or individuals even within areas that comprise largely natural habitat can be restricted by urban development, leading to habitat degradation and fragmentation. The primary driver of population decline is that large and contiguous habitats were divided into isolated and smaller patches. Habitat fragmentation by human activities so seriously threatens the viability of plant populations that may result in shrinking population and even extinction. In addition to the influence of plant characteristics, historical events of the population, ecological factors, natural selection factors, interference of human activities, historical events and other factors will also lead to the formation of genetic structure in the population. This is mainly because their populations are more vulnerable to damage, and gene flow is considered one of the most important determinants of the genetic structure of plant populations. The study of genetic structure and gene flow play an important part in understanding the genetic characteristics and the dynamics of population, especially, those rare and endangered species with a limited geographical range. Population genetic structure is the result of interaction between ecological and genetic processes. The Creative Commons Public Domain Dedication waiver ( ) applies to the data made available in this article, unless otherwise stated in a credit line to the data. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. Physical troubleshooting shows that " TM Reg offset" messages follow the linecard regardless of where it's installed.Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. " show tm log" shows " detected TM egress error" and repeated constant " TM Reg offset" for that linecard.Īpr 27 12:41:05: Slot 6 PPCR 0 TM Reg offset 0x00002980 Value 0x00000022Īpr 26 23:40:14: Slot 6 PPCR 0 TM Reg offset 0x00001580 Value 0x0000002aĪpr 26 23:40:14: Slot 6 PPCR 0 detected TM egress errorĪpr 26 23:40:14: Slot 6 PPCR 0 TM Reg offset 0x00002981 Value 0x00000020Īpr 26 23:40:14: Slot 6 PPCR 0 TM Reg offset 0x00002980 Value 0x00000022Īpr 26 23:40:13: Slot 6 PPCR 0 TM Reg offset 0x00001580 Value 0x00000022Īfter the linecard is moved to a different chassis, " show tm log" continues to show " TM Reg offset" for that same linecard. For a single linecard " show logging" shows " System: Health Monitoring: TM Egress data errors detected" and LACP flaps for an interface on that linecard.Īpr 26 10:41:18:A:System: Health Monitoring: TM Egress data errors detected on LP 6/TM 0Īpr 25 21:40:43:W:LACP: ethernet 6/1 state changes from LACP_BLOCKED to FORWARDĪpr 25 21:40:43:I:LACP: Port 6/1 mux state transition: not aggregate -> aggregateĪpr 25 21:40:43:I:LACP: Port 6/1 rx state transition: expired -> currentĪpr 25 21:40:43:I:LACP: Port 6/1 mux state transition: aggregate -> not aggregate (reason: timeout)Īpr 25 21:40:43:W:LACP: ethernet 6/1 state changes from FORWARD to LACP_BLOCKEDĪpr 25 21:40:43:I:LACP: Port 6/1 rx state transition: current -> expired (reason: timeout)
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