Enter the following commands in the CHR console:
/interface bridge
add name=br1
/interface bridge port
add bridge=br1 interface=ether1
/interface bridge vlan
add bridge=br1 untagged=ether1 vlan-ids=1
/ip address
add address=xxx.xxx.xxx.xxx/24 interface=br1 network=xxx.xxx.xxx.0
/ip route
add distance=1 gateway=xxx.xxx.xxx.1
/interface bridge set br1 vlan-filtering=yes
Change xxx.xxx.xxx.xxx for your server IP
and xxx.xxx.xxx for the first 3 segments of your server IP.