Motorola AP-7131 Product Reference Manual page 615

Configuring Mesh Networking 9-21
9.3.1.1 Configuring AP#1:
1. Provide a known IP address for the LAN1 interface.
NOTE Enable the LAN1 Interface of AP#1 as a DHCP Server if you intend to
associate MUs and require them to obtain an IP address via DHCP.
2. Assign a Mesh STP Priority of 40000 to LAN1 Interface.