Q:I am getting an error “Iteration limit exceeded …”, although I am using “option iterlim = 100000000;” in my model.

There are various ways of setting the iteration limit the solver works with and that overwrite “option iterlim = 1000000”. For example: modelname.iterlim or using a solver option file (e.g. itlim for Cplex). The parameter settings of an active solver option file will always overwrite the limits you have set in your model or as a command line parameter.