Помогли в англ. ветке, создал фича реквест https://github.com/opnsense/plugins/pull/2618, все сделали, тему можно закрывать.
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Show posts Menuroot@OPNsense:/ # /usr/local/bin/vtysh -c "show running-config"
Building configuration...
Current configuration:
!
frr version 7.4
frr defaults traditional
hostname OPNsense.localdomain
log syslog notifications
!
router bgp 65550
bgp router-id 192.168.1.1
no bgp ebgp-requires-policy
neighbor 10.11.1.1 remote-as 65550
neighbor 10.11.1.1 update-source gre0
!
address-family ipv4 unicast
neighbor 10.11.1.1 route-reflector-client
exit-address-family
!
line vty
!
end