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CC2538: Modifying link key in zigbee effecting interoperability

Part Number: CC2538
Other Parts Discussed in Thread: Z-STACK, SIMPLELINK-CC13X2-26X2-SDK

Hello,

I was having a concern if i modify the link key in zigbee for security purpose.

1. Suppose i have a coordinator as central unit on my cc2538 and any other device as router of some other make. For security reason i change the link key on my coordinator, how does the router knows the change in link key as it will not connect in the network due to invalid link key. How to solve this issue?

2. My aim is to achieve interoperability, is it recommended by zigbee standard to change the link key ?

Thank you,

Regards,

Akshaay