I have just upgraded the bird version to version 2. I just wonder whether there is anything we should configure for systemd to notify us of a syntax error in bird.conf while doing systemctl reload/restart bird?

It is no longer informing me somehow now.

# systemctl reload bird
#

# systemctl restart bird
Job for bird.service failed because the control process exited with error code.
See "systemctl status bird.service" and "journalctl -xe" for details.
# systemctl status bird.service
● bird.service - BIRD Internet Routing Daemon
   Loaded: loaded (/lib/systemd/system/bird.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2023-07-05 07:15:25 UTC; 9s ago
  Process: 71401 ExecStartPre=/usr/lib/bird/prepare-environment (code=exited, status=0/SUCCESS)
  Process: 71409 ExecStartPre=/usr/sbin/bird -p (code=exited, status=1/FAILURE)

Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session1: State changed to down
Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session1: Channel ipv4 removed
Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session2: State changed to down
Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session2: Channel ipv4 removed
Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session3: State changed to down
Jul 05 07:15:25 n246-040-093 bird[27010]: BGP_session3: Channel ipv4 removed
Jul 05 07:15:25 n246-040-093 bird[27010]: Shutdown completed
Jul 05 07:15:25 n246-040-093 systemd[1]: bird.service: Control process exited, code=exited, status=1/FAILURE
Jul 05 07:15:25 n246-040-093 systemd[1]: bird.service: Failed with result 'exit-code'.
Jul 05 07:15:25 n246-040-093 systemd[1]: Failed to start BIRD Internet Routing Daemon.

It is only when I manually enable, it triggers the error line:

# /usr/sbin/bird -f -u bird -g bird
bird: /etc/bird/bird.conf:4:1 syntax error, unexpected CF_SYM_UNDEFINED

I wonder whether I need to configure anything for BIRD 2?

Thanks,

Jimmy