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Community Member

"last input never" ?

Dear all,

Probably a wrong understanding or something stupid, but I can' find a decent answer.

On a lot of our C2950, C3560 and C3750I find following strange thing when doing a show interface x/x:

The last input is NEVER, although I see many packets in, 5 minute input rate is not 0 and counters have never been cleared.

I also see a mac-address when I do a show mac-adress-table interface x/x

Any idea what the reason is for this behaviour, our what the meaning is of "LAST INPUT" ?


Full dump:

FastEthernet0/16 is up, line protocol is up (connected)

Hardware is Fast Ethernet, address is x.x.x (bia y.y.y)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

Encapsulation ARPA, loopback not set

Keepalive set (10 sec)

Full-duplex, 100Mb/s, media type is 100BaseTX

input flow-control is unsupported 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: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 1000 bits/sec, 1 packets/sec

5 minute output rate 1000 bits/sec, 2 packets/sec

13333252 packets input, 1422539332 bytes, 0 no buffer

Received 164044 broadcasts (0 multicast)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 304 multicast, 0 pause input

0 input packets with dribble condition detected

32176313 packets output, 2767409130 bytes, 0 underruns

0 output errors, 0 collisions, 2 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


Re: "last input never" ?


Itz a normal behaviour on the ethernet interface,its the Number of hours, minutes, and seconds since the last packet was successfully received by an interface and processed locally on the router. Useful for knowing when a dead interface failed. This counter is updated only when packets are process-switched, not when packets are fast-switched.


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