Just implementing BFD on two seperate connections between two routers. One works fine, however, the other doesn't seem to be even attempting to send Control packets. On both routers the second interface is shows a Transmit Packet count of 0:
Both BGP sessions are established and you can ping the IP on both interfaces from both sides.
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[admin@router1] > routing bfd neighbor pr detail Flags: U - up 0 U interface=vl3104 - EDPK IX AU VLL address=103.xxx.yyy.29 protocols=bgp multihop=no state=up state-changes=2 uptime=5h1 required-min-rx=0.2s remote-min-rx=0.2s multiplier=5 hold-time=1s packets-rx=115531 packets-tx=115582 1 interface=sfp2 - EDPK address=103.xxx.yyy.21 protocols=bgp multihop=no state=down state-changes=0 desired-tx-interval= multiplier=5 hold-time=0s packets-rx=0 packets-tx=0
I've checked firewalls, all traffic is allowed from both sides, however since it doesn't even seem to be trying to TX I don't think its firewall related.