+ <!-- We have only one outer link, representing the internet
+ - Its sharing is FATPIPE, meaning that communications have no impact on each others.
+ - Any given comm can use the full provided bandwidth.
+ -
+ - This models the big links constituting the backbone of the internet,
+ - that users cannot saturate.
+ - Users' bandwidth is mostly limited by their outgoing connection,
+ - not by the network backbone.
+ -->
+
+ <link bandwidth="1.25GBps" id="backbone" latency="500us" sharing_policy="FATPIPE" />