hpe switch mac adress 000000-000000 in arp cache - what does it mean?

>> this is the result of an arp request, with no response

let's assume you have a subnet 192.168.2.0/24 and you ping the not existing ip address (not reachable ip address) "192.168.2.99" from the switch, then the arp table of your HPE Procurve / ArubaOs Switch will look like:

switch## show arp

IP ARP table

IP Address MAC Address Type Port
--------------- ----------------- ------- ----
192.168.2.13 abcdef-23df33 dynamic 1
192.168.2.99 000000-000000 dynamic

>> in the next 5 minutes (or dependant of your arp cache settings) you will see the 192.168.2.99 000000-000000 entry

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