Zebra on FRR 10.4 not working

[DerDennisOP]

When starting GoBGP with Zebra integration FRR logs show the following:

Nov 23 19:03:19 c systemd[1]: Started FRRouting.
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 18
Nov 23 19:03:20 c zebra[875]: [KMSKA-RYR7X][EC 4043309147] zebra_redistribute_default_delete: Specified afi 0 does not exist
Nov 23 19:03:20 c zebra[875]: [KMSKA-RYR7X][EC 4043309147] zebra_redistribute_default_delete: Specified afi 0 does not exist
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 11
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 11
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 11
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 11
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:20 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:20 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:21 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:21 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [HSMCT-F8EZK] Cannot set protodown off for interface 150994944; does not exist
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20
Nov 23 19:03:23 c zebra[875]: [PE6Y7-KR1RK] Zebra received unknown command 20

My current FRR version:

$> vtysh
Hello, this is FRRouting (version 10.3).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

Also GoBGP throws some errors:

Nov 23 19:39:44 c systemd[1]: Starting GoBGP Routing Daemon...
Nov 23 19:39:45 c gobgpd[928]: {"Topic":"Config","level":"info","msg":"Finished reading the config file","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"level":"info","msg":"gobgpd started","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c systemd[1]: Started GoBGP Routing Daemon.
Nov 23 19:39:45 c gobgpd[951]: {"Topic":"Config","level":"info","msg":"Finished reading the config file","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Topic":"Zebra","Version":6,"level":"info","msg":"success to connect to Zebra","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Data":"AAAAAgA=","Error":"message length invalid","Header":{"Len":15,"Marker":254,"Version":6,"VrfID":0,"Command":41},"Topic":"Zebra","level":"warning","msg":"failed to decode body","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Data":"AAAAAwA=","Error":"message length invalid","Header":{"Len":15,"Marker":254,"Version":6,"VrfID":0,"Command":41},"Topic":"Zebra","level":"warning","msg":"failed to decode body","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Data":"bG8AAAAAAAAAAAAAAAAAAAAAAAEFAAAAAAABAEkAAgAAAAAAAAAAAAAD6AABAAAAAQAAAAAAAAAAAAAAAAAeAAAAAAA=","Error":"lack of bytes in remain data. need 34 but 9","Header":{"Len":78,"Marker":254,"Version":6,"VrfID":0,"Command":0},"Topic":"Zebra","level":"warning","msg":"failed to decode body","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Data":"AAAAAQA=","Error":"message length invalid","Header":{"Len":15,"Marker":254,"Version":6,"VrfID":0,"Command":41},"Topic":"Zebra","level":"warning","msg":"failed to decode body","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"2001:db8::1","Topic":"Peer","level":"info","msg":"Can't find configuration for a new passive connection","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"192.0.2.1","Topic":"Peer","level":"info","msg":"Can't find configuration for a new passive connection","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"192.0.2.1","Topic":"config","level":"info","msg":"Add Peer","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"192.0.2.1","Topic":"Peer","level":"info","msg":"Add a peer configuration","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"192.0.2.2","Topic":"config","level":"info","msg":"Add Peer","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"192.0.2.2","Topic":"Peer","level":"info","msg":"Add a peer configuration","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"2001:db8::1","Topic":"config","level":"info","msg":"Add Peer","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"2001:db8::1","Topic":"Peer","level":"info","msg":"Add a peer configuration","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"2001:db8::2","Topic":"config","level":"info","msg":"Add Peer","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:45 c gobgpd[951]: {"Key":"2001:db8::2","Topic":"Peer","level":"info","msg":"Add a peer configuration","time":"2025-11-23T19:39:45Z"}
Nov 23 19:39:46 c gobgpd[951]: {"Key":"192.0.2.2","State":"BGP_FSM_OPENCONFIRM","Topic":"Peer","level":"info","msg":"Peer Up","time":"2025-11-23T19:39:46Z"}
Nov 23 19:39:47 c gobgpd[951]: {"Key":"192.0.2.1","State":"BGP_FSM_OPENCONFIRM","Topic":"Peer","level":"info","msg":"Peer Up","time":"2025-11-23T19:39:47Z"}
Nov 23 19:39:47 c gobgpd[951]: {"Key":"2001:db8::2","State":"BGP_FSM_OPENCONFIRM","Topic":"Peer","level":"info","msg":"Peer Up","time":"2025-11-23T19:39:47Z"}
Nov 23 19:39:47 c gobgpd[951]: {"Key":"2001:db8::1","State":"BGP_FSM_OPENCONFIRM","Topic":"Peer","level":"info","msg":"Peer Up","time":"2025-11-23T19:39:47Z"}

GoBGP is configured with zebra on version 6 and software-name to frr10.3 with redistribute-route-type-list to [ "kernel" "directly-connected" "static" ]. default-import-policy and default-export-policy is set to accept-route.
Full configuration: https://github.com/secshellnet/nixos-tests/blob/4afd2dc3bc4f793ea884060623363866bb35a7d5/tests/bgp-simple/default.nix#L213

Expected Behavior:
All routes that are showing in vtysh and have the correct route-type should be advertised.
Zebra should be able to install routes based on received routes.
Integration Test should succeed: secshellnet/nixos-tests#16

[DerDennisOP]

I tested it with older versions,which seemed to work. But it would be great if we could be getting the newest version running:

Following do work / do not work

• Frr - 10.4
• Frr - 10.3
• Frr - 9.1.3
• Frr - 9.0.x
• Frr - 8.5.7 and below

[fujita]

The zebra support isn't maintained now.