The handover, around 20 miles northeast of the regional capital Mekelle, was overseen by a monitoring team made up of members of the two sides and a regional body, the Intergovernmental Authority on Development.
Brigadier General Adwa Lebukan Peter is a representative of the monitoring team.
"The effort that we have seen today of the ceremony that you have seen today is a step in the right direction in achieving the African Union aim of silencing the guns by the year 2030. Which translates to solving African problems by Africans."
The demobilization of Tigray forces, who fought a two-year war against Ethiopia's federal government, is seen as central to the November 2 ceasefire agreement... along with the restoration of services and resumption of humanitarian aid.
Another part is the withdrawal of Eritrean troops, who fought alongside Ethiopia's army but were not party to the truce.
Eritrean soldiers pulled out of several major towns in Tigray late last month but have not left Tigrayan territory, according to residents.
Eritrea has declined to comment on whether troops will leave.
The conflict created famine-like conditions for hundreds of thousands of Tigray's population, killed thousands and displaced millions across northern Ethiopia.
