Interace counters, last input field.

From: G2 <farawayguy_at_gmail.com>
Date: Mon, 10 Aug 2009 13:55:20 +0300

Hey guys,

I was looking to put ports into an unroutable vlan and was hoping to
use the LAST INPUT field in the show interface command. I ran into
the below output. The interface is showing up/up, mac address table
is showing a device behind the port and I can ping the device. The
device is a scanner/printer.

I thought that last input field is supposed to tell you the last time
a packet was successfully received. Anyone run into this before?
Perhaps a bug in the IOS or just in my head?

B15_F2_3750_2#show int g2/0/21
GigabitEthernet2/0/21 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 0023.5e60.3015 (bia
0023.5e60.3015)
  Description: ***User Ports***
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 44/255, 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 00:00:11, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/0 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 17512000 bits/sec, 1578 packets/sec
     482027 packets input, 284181858 bytes, 0 no buffer
     Received 88 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     744286025 packets output, 1026363318778 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

Thanks,
Gary

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Received on Mon Aug 10 2009 - 13:55:20 ART

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