Drop reason counters.rx_portd_rdisc

Hello everyone, i'm asking for your help in order to undestand some values i'm seeing when looking for the drop reason in my big ip devices

I have 2 big ip i5600 devices in an Active/Standby configuration and both of them are reporting packet drops

Both devices have a unique trunk of 2 interfaces (1.1 and 1.2)which process all the application traffic (the HA configuration use this trunk too).

When runnig tmsh "show /net interface" i can see 1.7M in the "Drops in" field.

When running "tmctl drop_reason" according to https://my.f5.com/manage/s/article/K31938413  i can see the field "counters.rx_portd_rdisc" with a value of "1058490" which i thinks its arround 1M.

Both devices reports similiar values for "counters.rx_portd_rdisc" but ONLY in the interface 1.2

I cant find any information related to the "counters.rx_portd_rdisc" field of the drop reason.

Someone have an idea of what "counters.rx_portd_rdisc" means?

Thanks in advance for your answers!