Speculation: Cisco wanted to buy Xobni, but Xobni said they wouldn't sell for less than $too_much, so Cisco invested instead and will end up buying them later if they do well.
If you read "High Stakes, No Prisoners" (a book that both founders of Xobni recommend), the author recommends getting non-VC Series B investors so that you don't have the same genetic pool (i.e. Series A VCs colluding with Series B).
I think the more likely scenario is that this Series B is strategic for Cisco, wonder what they're cooking up.
Who needs country borders when you control all the routers ey!
Congrats guys, and sorry for calling you XnobiXnob all these years!