[c-nsp] Interface output

[Rodney Dunn]

Cisco IOS software keeps track of per-interface counters for unknown protocol drops. However,
these per-interface counters, that record packets with unknown (or unconfigured) protocol 
received, are not displayed in the <cmdBold>show interfaces<nocmdBold> command.
This is a request to display  those counters to aid in troubleshooting.
Alternatively, the number of unknown protocol drops can be retrieved through SNMP under the
MIB variable "ifInUnknownProtos", and the commands <cmdBold>show interfaces 
switching<nocmdBold> and <cmdBold>show interfaces stats<nocmdBold> display per-protocol
counters including an "Other" category, which might be used as well. However, using this second
method through the CLI gives more packets than actually "dropped due to unknown protocol".
It can serve as an indication, but the only workaround is to use SNMP and poll for 
"ifInUnknownProtos".

Interesting in your output you got 300 broadcast and 300 unknown protocol
drops. Maybe get a sniffer and correlate.

On Thu, Oct 04, 2007 at 08:28:51PM +0200, Ahmad Cheikh-Moussa wrote:
> Hi!
> 
> Can someone tell me, what it means, if I have "unknown protocol drops" ?
> I've got no packet loss. The speed is good too. 
> The cisco output interpreter says everything is ok.
> 
> Here the output of show interface :
> #sh int fastEthernet 0/1
> FastEthernet0/1 is up, line protocol is up
>   Hardware is Gt96k FE, address is 001b.d5ab.f0d5 (bia 001b.d5ab.f0d5)
>   Description: 
>   Internet address is x.x.x.x/28
>   MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
>      reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Full-duplex, 10Mb/s, 100BaseTX/FX
>   ARP type: ARPA, ARP Timeout 04:00:00
>   Last input 00:00:51, output 00:00:02, 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 0 bits/sec, 0 packets/sec
>   5 minute output rate 0 bits/sec, 0 packets/sec
>      301 packets input, 109560 bytes
>      Received 300 broadcasts, 0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>      0 watchdog
>      0 input packets with dribble condition detected
>      1834 packets output, 110550 bytes, 0 underruns
>      0 output errors, 0 collisions, 5 interface resets
>      300 unknown protocol drops
>      0 babbles, 0 late collision, 0 deferred
>      0 lost carrier, 0 no carrier
>      0 output buffer failures, 0 output buffers swapped out
> 
> 
> 
> Any ideas ?
> 
> Regards,
>  Ahmad
> 
> 
> -- 
> Ahmad Cheikh-Moussa 
> NetUSE AG
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