On BOTH Aruba switches, a single route to the TFTP server 10.92.100.60 is needed. The configuration may differ on the system in use.
This is needed because there are issues with Aruba ECMP hashing and TFTP traffic.
show ip route 10.92.100.60
Example output:
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
This route can be a static route or a BGP route that is pinned to a single worker. The 1.4.2 patch introduced the BGP pinned route.
Verify that you can ping the next hop of this route. For example, in the example above we would ping 10.252.1.9. If this is not reachable, this is the problem.