This action modifies an existing ACL rule to mirror traffic that matches that rule, or to stop mirroring that traffic. The mirroring port must be enabled when mirroring on an ACL rule is turned on. This could be configured earlier, or use the CLI action to execute CLI commands to configure mirroring at the same time.
For example (enabling mirroring from within CLEAR-Flow rule):
enable mirror to port 7:4 tagged mirror add acl_rule_1