> Thank your reply, that help me a lot.  But may be my question is not clear, 
> here is my question : Supposing that A is root MAP, and B, C is the other two 
> not root MAP .

If A is the root mesh STA, it will be the one generating out the RANN frame.

> Through sending RANN and  "hwmp_rann_frame_process", A  has the root path to 
> B and C, but B does't has direct path to C .

> So according the protocol , the data form B to C will first send to A, then A 
> will transfer the data to C through the root path .

If A, B and C are all joining the same MBSS, B and C will still go to
direct path if B and C can reach each others. B and C will use the
on-demand path selection or AODV to establish the direct link, unless
you block the communication between B and C. You can block B and C to
communicate directly using "iw dev $MESH_IFACE station set $HW_ADDR
plink_action block"

---
ChunYeow
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