Jonathan, This March I reported to peering@ a similar problem to RR1; I’m not sure when my problem started, I only noticed it while doing CLI jockey work on my router. I have had success removing and adding the BFD session on my Juniper. Over the last three months I saw one recurrence to RR1 but it was over v4 and v6; same solution for me. I didn’t spend time debugging JunOS further [myself or with jtac]. My side is a Juniper MX running 20.4. I have since added BFD session monitoring so I'm not reliant on syslogs. -Michael From: MICE Discuss <MICE-DISCUSS@LISTS.IPHOUSE.NET> On Behalf Of Richard Laager Sent: Wednesday, June 21, 2023 6:54 PM To: MICE-DISCUSS@LISTS.IPHOUSE.NET Subject: Re: [MICE-DISCUSS] Route Server 1 - BFD not working On 2023-06-21 14:06, Jonathan Stewart wrote: On our BGP session to Route Server 1 (206.108.225.1 & 2001:504:27::d1af:0:1) i have lost the BFD session. My Juniper router shows the state as "Down". Is this intentional? An accident of the upgrades? Is my configuration wrong? Anyone else noticing this? My configuration is an interval of 1000 ms, multiplier 3. MICE is configured as 500 * 3 tcpdump shows your BFD control packets coming in, but bird is not responding. I'm seeing the same issue with 206.108.255.137 (Inteliquent AS 40160) on IPv4 and 2001:504:27:0:0:B7F8::1 (Compudyne, AS47096) on IPv6. Everyone else is consistent between the two route servers. This thread from 2020 talks about someone having BFD issues after a reboot, which they fixed by restarting BFD in BIRD. That might be something to try if we run out of other ideas: https://www.mail-archive.com/bird-users@network.cz/msg05382.html Before I try that, have you tried flapping your BGP session? -- Richard ________________________________ To unsubscribe from the MICE-DISCUSS list, click the following link: http://lists.iphouse.net/cgi-bin/wa?SUBED1=MICE-DISCUSS&A=1