vyos@vyos:~$ show conf com | match dhcp
set service dhcp-server shared-network-name NET_01 authoritative
set service dhcp-server shared-network-name NET_01 name-server '1.1.1.1'
set service dhcp-server shared-network-name NET_01 subnet 192.0.2.0/24 range R1 start '192.0.2.21'
set service dhcp-server shared-network-name NET_01 subnet 192.0.2.0/24 range R1 stop '192.0.2.254'
vyos@vyos:~$ 
vyos@vyos:~$ show dhcp server leases 
IP address    Hardware address    State    Lease start          Lease expiration     Remaining    Pool    Hostname
------------  ------------------  -------  -------------------  -------------------  -----------  ------  ----------
192.0.2.27    50:08:00:06:00:02   active   2022/04/19 12:04:19  2022/04/20 12:04:19  23:59:27     NET_01  vyos
vyos@vyos:~$ 
vyos@vyos:~$ show dhcp server statistics 
Pool      Size    Leases    Available  Usage
------  ------  --------  -----------  -------
NET_01     234         1          233  0%
vyos@vyos:~$

set interfaces ethernet eth2 address 'dhcp'
set interfaces ethernet eth2 address 'dhcpv6'
set interfaces ethernet eth3 address 'dhcp'
set interfaces ethernet eth3 address 'dhcpv6'

vyos@vyos:~$ show int
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface        IP Address                        S/L  Description
---------        ----------                        ---  -----------
eth0             -                                 u/u  
eth1             -                                 u/u  
eth2             100.64.20.21/24                   u/u  WAN01
                 2001:db8:23::934f/128                  
eth3             100.64.30.21/24                   u/u  WAN02
                 2001:db8::934f/128