The incident took place shortly after 7pm on Saturday night in the Harcourt Drive area of the city.
The victim was taken to hospital for treatment to a serious cut on his cheek but his condition is described as stable.
serious laceration to his cheek. His condition is described asstable.
The 17-year-old suspect remains in custody at this time.
Detectives are appealing for anyone who witnessed the incident or anyone who has any information that can assist with the investigation to contact detectives at Musgrave Police Station on 101, quoting reference number 1285 of 17/09/16.
Or if someone would prefer to provide information without giving their details, they can contact the independent charity Crimestoppers and speak to them anonymously on 0800 555 111.