Inability to ping Aruba WLC from a directly connected QFX5120-32C via a trunk port.

- Initially the mac was correctly learned on both sides, however, no ARP entry on either side was present.

- Setting a static ARP on both sides and they were still unable to communicate.

Aruba has a way for setting vlans on ports as 'trusted' and 'untrusted'. Issue resolved after configuring the passing vlans as trusted.

Refer to this link for further configuration instructions on the Aruba:

https://www.arubanetworks.com/techdocs/ArubaOS_83_Web_Help/Content/ArubaFrameStyles/Network_Parameters/config_trsted_or_untrsted_ports_and_vlans.htm