If you ask me, I think this idea is dead. You cannot get a good representation of how the topology really is from trying to walk nodes using NCP. (remove bridged ethernet that are not point-to-point with only 2 nodes). Walk through the "known cir" and then "cir char" and build your own connectivity tree with the metrics. Plot all links Apply DECnet routing rules and Colour the links that carry traffic with the current metrics and/up/down condition, use two colours, one for transmitt one for receive (as links can end up being simplex). ..-P