I'm running an OSPF network (topology attached)
Router D is in the UK and sending out multicast traffic to routers A, B and C. All routers are running OSPF and are in a /26 network for the ports that are on the VPLS.
On router D I'm seeing 2 way to router C (using show ospf neighbour).
Can someone explain what that means please? I've read the documentation but I don't feel any the wiser for it.
Does it mean that for traffic from the "rest of network" switch to router C it will not go Switch->Router D -> Router C, but rather through another router first (either A or B)?
On OSPF network type "broadcast" the DROther routers (that is, not DR and not BDR) are seeing each other as 2Way.
So what you are reporting may be normal assuming C and D are not DR/BDR routers.
And no, 2Way does not mean packet from C has to get to D first in order to travel to subnet beyond A.
So what you're basically saying is that this is normal?
That's great, thank you.
This is normal behavior, when you have broadcast network.
Your router should see DR and BDR with state "FULL" and DROTHER in "2way " state.
How does one configure a router to be the DR or BDR?
It's an election process.
Infuence the results by configuring priority.