Richard's debugging suggested it was BIRD not responding to valid BFD packets transmitted from our Juniper router. But almost all BFD sessions are up, so what's wrong with this specific one--or pair in this case? There was a fibre cut which disconnected AS18451 from MICE for 1.5 days--maybe at service restoration there was packet loss for the first few seconds, so BFD handshaking failed? The problem for diagnosis is reproduceability. Since a session reset fixed the problem, we can't reproduce the problem, and that makes diagnosis impossible without additional data. To be clear, I don't expect any further action from MICE, as the problem is resolved. I'm just discussing troubleshooting and the limitations of our knowledge about this problem. Cheers, Jonathan Stewart AS18451 On Thu, 2023-06-22 3:53 p.m., Mike Horwath wrote:
On Thu, Jun 22, 2023 at 02:40:14PM -0500, Jonathan Stewart wrote:
Disable the BGP (and thus also BFD) session, waited a minute, and re-enabled BGP & BFD.
Came back as normal and looks fine now on both IPv4 and IPv6.
Thanks for the assistance Richard.
Though it's still not clear what the real cause of the problem was. Bugs from the router vs the route-server perhaps?
I hate magic like this. Magic sucks