root@myhost:~# docker exec -it frr vtysh

Hello, this is FRRouting (version 10.2.3_git).
Copyright 1996-2005 Kunihiro Ishiguro, et al.

myhost# 
myhost# 
myhost# show run
Building configuration...

Current configuration:
!
frr version 10.2.3_git
frr defaults traditional
hostname myhost
no ipv6 forwarding
!
ip route 192.168.111.1/32 reject
!
end
myhost#