Hello operators, This morning some users running FRR BGP noticed that their sessions were flapping. Investigation revealed that this was caused by an experiment being run by SwiNOG [0] which was triggering an undesired code path in FRR. Specifically, FRR uses attribute type 0xFF as the attribute code for VNC [1]. This code was intended to be turned off by default, but our current published builds [2] have it turned on. Consequently, bgpd attempts to parse the received attribute as a VNC attribute and fails, triggering a session reset. We have a patch in testing now and expect to have new build artifacts published shortly. Additionally, we have contacted the experiment operators and requested a pause in the experiment while we handle this issue. Thank you to the operators that notified us this morning! - FRR maintainer team [0] http://lists.swinog.ch/public/swinog/2018-December/007110.html [1] http://docs.frrouting.org/en/latest/vnc.html [2] https://github.com/FRRouting/frr/releases