Paul Koning wrote: Paul Koning wrote: ... The routing message size isn't an issue in Phase IV because the data can be sent in pieces. That was another important change from Phase III, which always sends the route data for all nodes (up to 255 of them) whether there is a change or not. 255 nodes just barely fits into a standard DDCMP packet, but 1023 nodes would not. (Nor in a standard Ethernet frame, for that matter.) And it's wasteful to send data that hasn't changed. So Phase IV has a way to send routing data for selected nodes. Looking at traffic, I'd say that systems seems to be sending out routing packet updates although nothing is changing. Oh right... I forgot one detail. Routing updates are sent when something changes, and those (in Phase IV) can be optimized to omit what hasn't changed. In addition, full routing messages (all destinations) are sent periodically. That makes the system "self-stabilizing": if any node is confused about the routing data, it will reasonably soon be straightened out by a full update. Yes. That more match with the reality as I can observe it. :-) Johnny