Hello all, Newbie on FRR and also Babel I made a test setup as 2 frr routers They have 2 interfaces in common subnet.. and a 3rd interface which only belongs to each router seperately.. First i tried the config with ospfd The 3rd interface routing appeared correctly and 1st router was able to ping 3rd interface of the other router (and vice versa) Then i wanted to test babel.. Disabled ospfd Made an example config for babel ! ! interface eth0 babel hello-interval 100 ! interface eth2 babel wired babel hello-interval 100 ! interface eth1 babel hello-interval 100 ! ! router babel network eth0 network eth1 network eth2 redistribute ipv4 connected When starting FRR i am getting the following errors Starting Frr daemons (prio:10):. zebra2018/10/18 17:59:30 warnings: ZEBRA: [EC 4043309104] Disabling MPLS support (no kernel support) . babeldThere is same network configuration eth0 There is same network configuration eth1 There is same network configuration eth2 eth0 : common interface 10.1.1.231-10.1.1.232 eth1: seperate interface 192.168.20.1 / 192.168.21.1 eth2: common interface 192.168.30.1 / 192.168.30.2 Here is the routing : 0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0 10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.30.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 after a second 0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0 10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.21.0 10.1.1.232 255.255.255.0 UG 0 0 0 eth0 192.168.30.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 As you see routing seem ok after a second.. but on next second it dissapears. So do ping.. PING 192.168.21.1 (192.168.21.1) 56(84) bytes of data. ping: sendmsg: Network is unreachable 64 bytes from 192.168.21.1: icmp_seq=4 ttl=64 time=1.58 ms 64 bytes from 192.168.21.1: icmp_seq=6 ttl=64 time=0.751 ms ping: sendmsg: Network is unreachable 64 bytes from 192.168.21.1: icmp_seq=8 ttl=64 time=0.868 ms Here is the output of babel interface ospfd-3# sh babel route 10.1.1.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52317 age 2 via eth1 neigh fe80::986c:adff:fef9:5113 nexthop 192.168.21.1 (feasible) 10.1.1.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52318 age 1 via eth2 neigh fe80::9885:8cff:fe66:8028 nexthop 192.168.30.2 (feasible) 192.168.21.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52318 age 1 via eth1 neigh fe80::986c:adff:fef9:5113 nexthop 192.168.21.1 (installed) 192.168.21.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52318 age 1 via eth2 neigh fe80::9885:8cff:fe66:8028 nexthop 192.168.30.2 (feasible) 192.168.30.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52317 age 2 via eth1 neigh fe80::986c:adff:fef9:5113 nexthop 192.168.21.1 (feasible) 192.168.30.0/24 metric 65535 refmetric 0 id f2:e7:01:ff:fe:4e:47:eb seqno 52318 age 1 via eth2 neigh fe80::9885:8cff:fe66:8028 nexthop 192.168.30.2 (feasible) 10.1.1.0/24 metric 0 (exported) 192.168.20.0/24 metric 0 (exported) 192.168.30.0/24 metric 0 (exported)