Log shows
Apr 03 20:11:29 tdcg-ams-er02 zebra[1507]: 0:2a0c:44c0:2::/48: Route install failed
Apr 03 20:11:29 tdcg-ams-er02 zebra[1507]: 0:2803:b140::/32: Route install failed
Apr 03 20:11:29 tdcg-ams-er02 zebra[1507]: [EC 4043309093] netlink-dp (NS 0) error: Invalid argument, type=RTM_NEWROUTE(24), seq=23598047, pid=3671141242
Apr 03 20:11:29 tdcg-ams-er02 zebra[1507]: [EC 4043309093] netlink-dp (NS 0) error: Invalid argument, type=RTM_NEWROUTE(24), seq=23598045, pid=3671141242
The route is listed 3 times in BGP
show ipv6 bgp 2a0c:44c0:2::/48 | strip-private
BGP routing table entry for xxxx:xxxx:2::/48
Paths: (3 available, best #1, table default)
Advertised to non peer-group peers: xxxx:xxxx:15::231 xxxx:xxxx:15::232 xxxx:xxxx:15::233 xxxx:xxxx:15::234 fd00::xxxx:xxxx:137:229 fd00::xxxx:xxxx:137:230 fd00::xxxx:xxxx:137:236 fd00::xxxx:xxxx:137:238 20562 6830 198611 xxxx:xxxx:0:1::123:3 from xxxx:xxxx:0:1::123:3 (xxx.xxx.0.241) (fe80::xxxx:xxxx:5978:a8c0) (used) Origin IGP, metric 0, localpref 140, valid, external, bestpath-from-AS 20562, best (Local Pref) Community: 30870:300 30870:320 30870:20562 Last update: Fri Apr 3 xxxx:xxxx:52 2020 24785 6830 198611 xxxx:xxxx:0:1::123:1 from xxxx:xxxx:0:1::123:1 (xxx.xxx.0.225) (fe80::xxxx:xxxx:5918:3c00) (used) Origin IGP, metric 0, localpref 90, valid, external, bestpath-from-AS 24785 Community: 30870:500 30870:24785 Last update: Fri Apr 3 xxxx:xxxx:51 2020 24785 6830 198611 xxxx:xxxx:0:1::123:2 from xxxx:xxxx:0:1::123:2 (xxx.xxx.0.226) (fe80::xxxx:xxxx:5918:e400) (used) Origin IGP, metric 0, localpref 90, valid, external Community: 30870:500 30870:24785 Last update: Fri Apr 3 xxxx:xxxx:51 2020
But only once in the routing table
show ipv6 route 2a0c:44c0:2::/48 | strip-private
Routing entry for xxxx:xxxx:2::/48
Known via "bgp", distance 20, metric 0, best Last update xxxx:xxxx:13 ago * fe80::xxxx:xxxx:5978:a8c0, via eth7.1881, weight 1
Some of the times BGP shows 4 and 2 are installed.
It only happens with IPv6 routes received from BGP peers.