My edge router is connected to one transit ISP full route table and to IXP. I would like to know what is the best way to protect the connection to IXP from becoming unwilling transit ISP. For example if one of the IXP members will point static route to my next hop for network that is not one of my prefixes he will be able to reach it because the edge router has full routing table and that way I will become unwilling ISP. I was finding about configuring an ACL on the ingress port from the IXP that permit traffic that only designated to my network prefixes. Is there any another way to do it ?