Hello Nandan, Interface with index 1 is IP loopback interface (127.0.0.1) and its MAC is set to zero. The second argument you're passing must be 0. Otherwise, you can retrieve msw and lsw from: ip_0.nx_ip_interface[0].nx_interface_physical_address_msw and ip_0.nx_ip_interface[0].nx_interface_physical_address_lsw. Regards
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