How to advertise network Mikrotik Router OS v7? you might notice that the network menu is missing.
BGP network advertise v6
/routing bgp network add network=192.168.0.0/24 synchronize=yes
/ip route add dst-address=192.168.0.0/24 type=blackhole
Now networks are added to the firewall address-list and referenced in the BGP configuration
BGP network advertise v7
/ip/firewall/address-list/
add list=bgp-networks address=192.168.0.0/24
/ip/route
add dst-address=192.168.0.0/24 blackhole
/routing/bgp/connection
set peer_name output.network=bgp-networks
Ref : Here