I found a version of quagga-1.2.4-2.el8.x86_64.rpm from redhat that worked fine when I replace frr with it. Hello, I am trying to get frr-7.0-10.el8.x86_64 bgp to connect to quagga-0.99.22.4-1.el6.x86_64 and it isn't working. I have no problem with the same bgpd.conf files when just using quagga. in a tcpdump on the frr side i see this error ... length 21: BGP Notification Message (3), length: 21, Finite State Machine Error (5) subcode Unknown (0) this what i see on the frr side Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.9.0.4 4 65004 0 0 0 0 0 never Active this is what i see on the quagga side Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.9.0.1 4 65001 39 41 0 0 0 00:45:53 Idle any thoughts ? -- Stephen Clark Email Confidentiality Notice: The information contained in this transmission may contain privileged and confidential and/or protected health information (PHI) and may be subject to protection under the law, including the Health Insurance Portability and Accountability Act of 1996, as amended (HIPAA). This transmission is intended for the sole use of the individual or entity to whom it is addressed. If you are not the intended recipient, you are notified that any use, dissemination, distribution, printing or copying of this transmission is strictly prohibited and may subject you to criminal or civil penalties. If you have received this transmission in error, please contact the sender immediately and delete this email and any attachments from any computer. Vaso Corporation and its subsidiary companies are not responsible for data leaks that result from email messages received that contain privileged and confidential and/or protected health information (PHI).