interface snmp index persistency

[mfis90]

Regarding SNMP, on the same hardware model, same software version the following command returns different values:
sh snmp mib ifmib ifindex gigabitEthernet 2/0/1
GigabitEthernet2/0/1 Ifindex = 53
GigabitEthernet2/0/1 Ifindex = 249

is there a way to configure index persistence on the platform?
this is on C9300-24T 17.13.01 CAT9K_IOSXE

The reason for this question is because my software only supports static configuration of indexes.

[marce1000]

           - Try : snmp ifmib ifindex persist
                     (in configuration mode)

  M.

[mfis90]

do you know why is this command used? or can you explain?