On BOTH Aruba switches we need a single route to the TFTP server 10.92.100.60 (your configuration may differ).
This is needed because there are issues with Aruba ECMP hashing and TFTP traffic.
show ip route 10.92.100.60
Displaying ipv4 routes selected for forwarding
'[x/y]' denotes [distance/metric]
10.92.100.60/32, vrf default, tag 0
via 10.252.1.9, [70/0], bgp