I am attempting to setup bfd with IPv6 on Cisco 4948E-E running IOS 15.2. bfd on IPv4 works great, but I'm having troubles with IPv6 and spent hours on it. The trouble exists whether I use OSPFv3 or BGP. Each side transmits, but the other side doesn't receive. Same interface works fine on IPv4. Any and all help would be appreciated! Using this on the interface of each switch: ospfv3 1 bfd ospfv3 1 ipv6 area 0 ospfv3 1 ipv6 bfd bfd interval 500 min_rx 500 multiplier 40 #show bfd neighbors details IPv6 Sessions NeighAddr LD/RD RH/RS State Int FE80::A2EC:F9FF:FE2B:B33F 68/0 Down Down Te1/52 Session Host: Software OurAddr: FE80::BA38:61FF:FE65:20BF Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 40 Received MinRxInt: 0, Received Multiplier: 0 Holddown (hits): 0(0), Hello (hits): 1000(566) Rx Count: 0, Rx Interval (ms) min/max/avg: 0/0/0 last: 23068067 ms ago Tx Count: 566, Tx Interval (ms) min/max/avg: 756/1000/875 last: 268 ms ago Elapsed time watermarks: 0 0 (last: 0) Registered protocols: OSPFv3 CEF Last packet: Version: 1 - Diagnostic: 0 State bit: AdminDown - Demand bit: 0 Poll bit: 0 - Final bit: 0 C bit: 0 Multiplier: 0 - Length: 0 My Discr.: 0 - Your Discr.: 0 Min tx interval: 0 - Min rx interval: 0 Min Echo interval: 0 #