Hello,
i have mikrotik CCR2004 and i like to add another ASN to my mikrotik in order to announce new /24 prefix through the new ASN (AS200) that will peer with AS100 then go to ISP (AS50),
Example:
AS 100 connected to ISP (AS50)
AS 200 peers with AS 100 then AS100 announce to the ISP (AS50),
AS PATH should be AS200 AS100 AS50
is this possible?

i believe this is possible with VRF. apparently prepending a different AS with filters is considered "wrong".
viewtopic.php?t=185852#p933186

Add VRFs and leak connected routes
https://help.mikrotik.com/docs/pages/vi ... uteleaking

then set up BGP connections between VRFs.
That way you can simulate or fake any eBGP setup you like.