i am working on ma CCNP certification nowdays and to be more specific BSCI ...i'm using dynamips for trainig but the problem is
FRAME-RELAY
when i'm trying to configure aframe-relay some commands does not work at all & that makes me feel foolish ...some commands lik

like when i'm trying to configure subinterfaces and makes it piont or multi-point

ISDN
is the big problem for me

does not accept the BRI or the PRI Interfaces
when i put the spids which i get from my service provider
and configuring ISDN switch type

plz help