Hi there I am testing FRR as an alternative to Quagga on what is a very busy core router - with multiple full table BGP Sessions. I am currently using this on Slackware 14.2 ... I have things up and running and some of the quagga bugs seem to have been cleared which is a PLUs BUT I am seeing oddness - most obviosuly with IPv6. Running a traceroute from a server behind it is alternating between traceroute6 l.root-servers.net traceroute to l.ROOT-SERVERS.NET (2001:500:9f::42) from 2a00:1940:0:1::78, 30 hops max, 24 byte packets 1 lon1-gw1.merula.net (2a00:1940:0:1::70) 0.647 ms 0.389 ms 0.425 ms 2 2a00:1940:0:1::67 (2a00:1940:0:1::67) 0.454 ms 0.565 ms 2.283 ms 3 2001:7f8:17::8480:1 (2001:7f8:17::8480:1) 0.753 ms 0.662 ms 0.728 ms 4 2a00:1a80:0:1::5:2 (2a00:1a80:0:1::5:2) 7.458 ms 5.662 ms 5.59 ms 5 l.root-servers.net (2001:500:9f::42) 5.727 ms 5.722 ms 5.726 ms and traceroute6 l.root-servers.net traceroute to l.ROOT-SERVERS.NET (2001:500:9f::42) from 2a00:1940:0:1::78, 30 hops max, 24 byte packets 1 lon1-gw1.merula.net (2a00:1940:0:1::70) 0.481 ms * 0.682 ms !N 2 lon1-gw1.merula.net (2a00:1940:0:1::70) 0.614 ms !N 0.54 ms !N 0.529 ms !N The zebta.log file is filled with lines like: 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d1::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d2::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d3::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d4::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d5::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d6::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d7::/48 has 2 nexthops, but we can only use the first 1 2017/06/13 02:11:01 ZEBRA: zread_ipv6_add: Prefix 2402:2700:d8::/48 has 2 nexthops, but we can only use the first 1 and so on.... What am I missing here - I am sure it is probbay something really obvious ... Can you help point me the right way ? Thanks! Richard Richard Palmer | Director | Merula Limited Company Registered in England and Wales No. 3243995 5 Avro Court, Huntingdon, Cambridgeshire, PE29 6XS Phone 01480 222940 | Support 0845 330 0666 Support Email support@merula.net