Hello MikroTik team
Why do you limit the number of routes by 251?
Could you please increase the number of routes limits? Thanks a lot.

Linux limitation.
What kind of limitation?
RouterOS does not have any limitation for routes number, output from one ours of BGP routers,
ip route print count-only
454970
According to this post, the limit is imposed by linux:
http://forum.mikrotik.com/viewtopic.php?f=2&t=73583&start=50#p373481