Correct solution is:
Add 192.168.20.255 with ffffffffffff on 192.168.20.0/24 interface ethernet 1/4.20 on Advanced tab in ARP entry section.
Next I'm able to wake up from workstation with 192.168.1.210 computer that has IP 192.168.20.17 using
"mc-wol.exe 00:24:e8:23:97:31 /a 192.168.20.255"
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