[c-nsp] Lot of input errors on a NPE-G1 interface

[Erich Hohermuth]

Hi

After the port-fast discussion back to your original question. The first
thing to look is the interface controller (show controller , show ip
interface) and the logging to make sure I don't have speed/duplex or
flow-control problems.

Second you get "unknown protocol drops" this happens mostly from cdp
packets. You send cdp from your switch but drop them on your router.

I my case I had to enable flow-control on my 3560 switch and allow pause
frames from the npe-g1. Hint: Sometimes it is more reliable to turn the
auto-neg feature off

Regards
 Erich

> 
> NPE-G1:
> ------------
> GigabitEthernet0/1 is up, line protocol is up
>   Hardware is BCM1250 Internal MAC, address is 0006.52f4.d81b (bia
> 0006.52f4.d81b)
>   Internet address is x.x.x.x/28
>   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
>      reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation ARPA, loopback not set
>   Keepalive set (10 sec)
>   Full-duplex, 1000Mb/s, link type is autonegotiation, media type is SX
>   output flow-control is XON, input flow-control is XON
>   ARP type: ARPA, ARP Timeout 04:00:00
>   Last input 00:00:00, output 00:00:00, output hang never
>   Last clearing of "show interface" counters never
>   Input queue: 0/75/1321/1 (size/max/drops/flushes); Total output drops: 0
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   5 minute input rate 4264000 bits/sec, 871 packets/sec
>   5 minute output rate 5859000 bits/sec, 1597 packets/sec
>      27479327 packets input, 3434822229 bytes, 0 no buffer
>      Received 941 broadcasts, 0 runts, 0 giants, 0 throttles
>      989 input errors, 0 CRC, 0 frame, 989 overrun, 0 ignored
>      0 watchdog, 17119 multicast, 0 pause input
>      0 input packets with dribble condition detected
>      43616309 packets output, 2243854018 bytes, 0 underruns
>      5 output errors, 0 collisions, 4 interface resets
>      561 unknown protocol drops
>      0 babbles, 0 late collision, 0 deferred
>      5 lost carrier, 0 no carrier, 0 pause output
>      0 output buffer failures, 0 output buffers swapped out