President Rodrigo Duterte last week signed the law, a key step to ending a Muslim rebellion in the south of the mainly Catholic Philippines that had claimed about 150,000 lives since the 1970s.

Moro Islamic Liberation Front (MILF) members, supporters and local residents from various parts of the southern island of Mindanao, including women in headscarves and fighters carrying arms, trooped to the main MILF camp there for a consultation.

Their leaders are seeking support for the law ahead of a referendum on the measure, which creates an expanded autonomous region and is aimed at ending one of Asia's longest and deadliest conflicts.

"This is our dream. If we end this (fighting), hopefully we can live in peace," Nasser Samama, a 61-year-old veteran rebel fighter, told AFP inside MILF headquarters at Camp Darapanan.

"Most people want peace and so do we in the MILF forces. What the MILF has achieved is not just for our group but for the whole of Mindanao."

Muslim rebels have long been battling for independence or autonomy in Mindanao, which they regard as their ancestral homeland.

The law aims to enforce a historic but fragile 2014 peace deal under which the MILF vowed to give up its quest for independence and lay down the weapons of its 30,000 fighters in return for self-rule.

Under the law, a new political entity known as the Bangsamoro Autonomous Region would replace the current autonomous region created following a 1996 deal with another rebel group, the Moro National Liberation Front.

The Bangsamoro is set to have more powers and cover a bigger area.

MILF leaders approve of the measure but say its communities would need to back the law for it to pass a plebiscite.

On Sunday many of the group's members, who have endured decades of conflict, said they supported the law.

"This is the beginning of peace in Mindanao. This is the start of unity between Muslims and Christians," housewife Babaidi Budain told AFP.

Some expressed fear the law would not bring development to the resource-rich but poverty-stricken south.

"Everyone in Mindanao should avail themselves of the opportunity the region offers. If not, it would be the same, the Bangsamoro would not prosper," said community worker Nasser Sulaiman.