Hadith.1453 - Jamil ibn Darraj narrated from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام that He said: "The prayers of the two Eids (Eid al-Fitr and Eid al-Adha) are obligatory, and the prayer of the eclipse (Salat al-Kusoof) is also obligatory."
It means that they are among the minor obligatory acts, and the minor obligations are considered Sunnahs, according to the narration of Hariz.