Starting from the Alpe Pertus, leave route ETON408 to the left descending towards the Refuge Farmhouse Salvin and climb right until the weather station near the Alpe Costapiana 2046 m. Here we reach the road from Chiaves and continuing along a stretch, to the left we join route ETON332 climbing from Lake Monastero. Here bypass 2B ends and we continue along the road towards Alpe di Coassolo (AVC stage 3).