Reference Post http://www.deyisupport.com/question_answer/wireless_connectivity/zigbee/f/104/t/61232.aspx
Feel if it is in the same network, then all the Panid and extension Panid are the same, that Panid limited to 0x3fff, so we can use 64bit extension Panid as the designated address, specific methods refer to the above post, TI The engineer recommends the following:
It is recommended to use Extendpanid node selection to join a specific network, generally a coordinator network, usually with their own 64-bit IEEE address as Extendpanid, This allows each coordinator network to have a unique extendpanid, so the node after the Discover network, you can choose to set their own Extendpanid matching network to join.
will be Zgapsuseextendedpanid set the Extendpanid to be added to the network.
Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.
ZigBee Panid Extended Panid