Issue
In general we can find details for each physical interface by using the show arp command as in the following example:
> show arp ethernet1/24
However, there does not appear to be an option to view ARP details for a sub-interface.
Resolution
In order to view the ARP details for a sub-interface, use the show arp command and manually add the the sub-interface number.
The example below shows an output for an existing sub-interface number, 335:
> show arp ethernet1/24.335
maximum of entries supported : 32000
default timeout: 1800 seconds
total ARP entries in table : 3
total ARP entries shown : 3
status: s - static, c - complete, e - expiring, i - incomplete
interface ip address hw address port status ttl
--------------------------------------------------------------------------------
ethernet1/24.335 10.11.228.11 00:18:8b:47:28:41 ethernet1/24 c 550
ethernet1/24.335 10.11.228.235 00:30:17:06:9b:69 ethernet1/24 c 1798
owner: ssunku