On 04/28/2012 09:07 PM, Peter Lothberg wrote: I have three cisco boxes for my DECnet and would be happy to do a GRE tunnel.. Peter! It's great to see you in this gang. It has been a long time; I hope you're doing well. Drop me a note sometime and let me know what's been going on over there. I live in Sunnyvale, CA since 1997... -:) If you and Brian and I set up three tunnels between us, will IOS do spanning tree between them? Spanning_Tree? This is the distater that Jonny started with ethnernet bridges..... (on the other hand without that there would be no HECNet so I'll be quiet, I just wish he changed it to do l2tvp3, don't need to do the signalling just the encap..) (it don't solve the loop problem, but now a c router could terminate a Jonny tunnel..) DECnet-4 has a link-state routing protocol, it's what Radia did before IS-IS, it has L1 and L2 routing decided by the area number. So, as long as the tunnels are PTP between routers it will do DECnet routing, and the metric is cost and hops (look at a ethnernet routing vector it's indexed with node number and has cost,hop in 16 bits..) In short, do nothing, set metric to 10 all all over the place and it will just work. What is your IP address? Mine are on the HECnet mailinglinst. -P w4kel/sm4kel