Filtering a specific ip range in BGP

RouterOS General
1

Hello,
I have a BGP Router running on ROS 7.6. I have 2 upstream providers, BGP comes as full route from my 2 upstream providers. I have a /24 ip block. I want to route the /28 part of my /24 block to my 1st upstream provider. I want to route the remaining ip to my 2nd upstream provider. What kind of filter should I enter for this?

Thank you in advance for your help.

2

You will have to physically split your subnet into several, with all the ensuing consequences (each has its own gateway etc.).
After that

/ip/firewall/address-list
bgptoisp1=x.x.x.0/28

bgptoisp2=x.x.x.16/28
bgptoisp2=x.x.x.32/27
bgptoisp2=x.x.x.64/26
bgptoisp2=x.x.x.128/25

bgp->isp1
output.network=bgptoisp1
bgp->isp2
output.network=bgptoisp2