Seems like Tiered.
Tiered:
Tiered WAN topologies are similar to the hierarchical hybrid
topologies used with LANs. In a tiered WAN topology, WAN sites
connected in a star or ring formations are interconnected at
different levels, with the interconnection points being organized
into layers.
Variations on this topology abound. Indeed, flexibility makes the
tiered approach quite practical. A network architect can determine
the best placement of top-level routers based on traffic patterns
or critical data paths. In addition, tiered systems allow for easy
expansion and inclusion of redundant links to support growth. On
the other hand, their enormous flexibility means that creation of
tiered WANs requires careful consideration of geography, usage
patterns, and growth potential.
http://www.angelfire.com/mech/phattony/wan_topologies.htm
edit: I was wrong, its mesh 
