It was not full mesh. ANF10 has routing with metrics
like DECnet and RDH even
wrote a driver to talk over Ethernet between KL's.
If anyone is curious, here below is a link to the ANF-to-Ethernet code by RDH.
It contains some nice explanation too :)
http://pdp-10.trailing-edge.com/bb-jr93k-bb/01/10,7/mon/d8eint.mac.html
G.