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8 unknown protocol drops , what does this mean ???

hi ,

on my router interface ,

i have the following by sh interface gi0/1 :

sh interfaces gigabitEthernet 0/1

GigabitEthernet0/1 is up, line protocol is up

  Hardware is MV64460 Internal MAC, address is 0026.caf7.c01b (bia 0026.caf7.c01b)

  Description: Internet From Gateway

  Internet address is x.x.x.x/24

  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 3/255, rxload 27/255

  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set

  Keepalive set (10 sec)

  Full-duplex, 1000Mb/s, media type is RJ45

  output flow-control is XON, input flow-control is unsupported

  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 00:04:03

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  30 second input rate 108483000 bits/sec, 15845 packets/sec

  30 second output rate 12834000 bits/sec, 10386 packets/sec

     3976038 packets input, 3409467490 bytes, 0 no buffer

     Received 46 broadcasts, 0 runts, 0 giants, 0 throttles

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

     0 watchdog, 1563 multicast, 0 pause input

     0 input packets with dribble condition detected

     2604241 packets output, 392141609 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     8 unknown protocol drops

     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

my question is , whats the meaning of  

     8 unknown protocol drops

?????

is it danger ???

regards

1 REPLY 1
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Cisco Employee

There is no danger :-)

it is caused by protocls not understood by the router/switch. like you may be receiving CDP packets and CDP is disabled on the interface.

Here is the link

http://www.cisco.com/image/gif/paws/12027/53.pdf

Thanks

Raju

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