I'm following the session remotely. Regarding Chin's question how to describe an STP which is a 40G link that is composed of four 10G links: I don't know how this is done in NSI as STP (I guess the choice is is to describe it either as 1 or 4 STP). In NML, you can relate this 40G link with the 10G links using the "isParallelCompound" relation, which is experimental (it's experimental because there is not yet enough info if/how to describe the order of the 10G links -- any input, including use cases are very welcome). To ask for "4 out of 10" ports -- to describe the 10 ports,it is usual to describe it as a PortGroup. How to ask for 4 individual links which follow the same path is an NSI-specific question (I have some ideas, but there is no NML answer to that). Freek