Hi I have a few CCR1036-8G-2S+, (6.22) I tried turning on BFD with OSPF. My first hurdle was BFD doesn't work by itself ! I then associated it with a OSPF interface, which had 4 nodes on it. Turned it on all 4 nodes.. worked for a while then up / down flapping ... I ran some tests sending flood pings down the line, no missed packets ! My final test, 2 of these boxes side by side, 1 cross over cable. Turned on OSPF + BFD, started to fail :( I have a nice simple firewall rule 10 ;;; Allow BFD chain=input action=accept protocol=udp dst-port=3784 log=no log-prefix="" I do have a drop invalid before it, but that should affect it and for a period of time BFD does come up. I have it attached to one of my BGP peers on a ROS VM, it seems to work fine. So I'm leaning toward an issue with CCR's So anyone else using BFD with CCR's and OSPF ? Alex