Last input never on active port

rasmus.elmholt · ‎10-31-2018

Hi

I just read this article about finding unused ports: https://www.m00nie.com/2012/02/show-free-not-used-for-a-while-ports-on-cisco-switch-with-one-command/

But I don't understand how there can be active ports with "Last Input Never"

I even have a port in my network where there is traffic on the port but the Last Input is still never:

GigabitEthernet2/0/5 is up, line protocol is up (connected) 
  Hardware is Gigabit Ethernet, address is xxxx.xxxx.xxxx (bia xxxx)
  Description: <User/voice port>
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1389460
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 29000 bits/sec, 5 packets/sec
  5 minute output rate 34000 bits/sec, 9 packets/sec

Can anyone please help me understand why?

Leo Laohoo · ‎10-31-2018

Could be a bug.
5 minute input/output rate shows something is moving.