Starting with ExtremeXOS 30.1, a single access control list (ACL) can have up to four mirror actions (each with a different mirror instance) to accomplish mirroring the same packet to multiple destinations (port, ERSPAN/remote-ip, RSPAN/remote-tag, etc).
Summit X450-G2, X460-G2, X670-G2, and ExtremeSwitching X690, X870 series switches.