source routing in zigbee

how can i source route for zigbee explain clearly
and what is the use of source routing.

source routing is mainly helpful when there is a large network, say 50 plus modules.

With SR, you tell modules to follow a particular path to reach destination module. It helps in reducing network traffic as intermediate modules do not have to perform route discovery (in case they don’t know destination module location)

I would recommend you to see product manual, it is describe well over there.