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Compiler/CC2538: Association table entry duplication at coordinator and routers

Part Number: CC2538
Other Parts Discussed in Thread: Z-STACK

Tool/software: TI C/C++ Compiler

In a Zigbee mesh network using z-stack 1.0 (CC2538) we investigated the parent child architecture using a network consisting of 12 hubs.
We could find a parent-child network association among the zigbee router nodes ( these are network address of routers)


But in the association table of  coordinator we see 10+1 (as per our network setting) hubs associated to coordinator. In this list we found router nodes 4afe, 40c, f10, 7c53, 881b, 22d5, a044, 1f0, feea, ba97, 91a5. Here f10,40c,22d5,4afe,1f0 and a044 are already in the association list of 91a5. This is confusing us to decide the parent child architecture. why same nodes are appearing in association table of coordinator and another device in the network?