As the most basic network of communication network

the reliability of transport network is related to the security of the whole communication network. The transport network itself has layered characteristics. Services are carried by the top channel layer

in which any fault will affect the performance of services. Now ODUk SNCP is mainly adopted for channel layer protection in OTN that is the main networking technology of transport network. In the present network when the end-to-end circuit adopts segmented ODUk SNCP

the single port connect is adopted between segments without protection

and services are interrupted in case of faults. In order to avoid such risks

this paper presents the background

working mechanism

network application and concerns of dual port ODUk SNCP cascading technology.