Strange output errors on a 3750 switch

[highmiles2]

Hello,

I am looking at the interface stats of port Fa1/0/2 and see something strange.

Ouput drops are 42Billion in 16mins, then 21249 few seconds later, then followed by 42Billion drops again, then 21444...and so forth..

I keep getting an entirely different output drops reading everytime i refresh within seconds of each refresh!

Any idea?

Thanks

--------------------------------------------------------------------------------------------------------------------------------------

sh int fa1/0/2

FastEthernet1/0/2 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is ecc8.8266.d604 (bia ecc8.8266.d604)

  Description: MSGMERGF1

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

     reliability 255/255, txload 12/255, rxload 11/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

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

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 2w4d, output hang never

  Last clearing of "show interface" counters 00:16:13

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4237333677

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

-------------------------------------

sh int fa1/0/2

FastEthernet1/0/2 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is ecc8.8266.d604 (bia ecc8.8266.d604)

  Description: MSGMERGF1

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

     reliability 255/255, txload 12/255, rxload 11/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

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

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 2w4d, output hang never

  Last clearing of "show interface" counters 00:16:21

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 21249

    Queueing strategy: fifo

  Output queue: 0/40 (size/max)

---------------------------------------------------------------------------

sh int fa1/0/2

FastEthernet1/0/2 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is ecc8.8266.d604 (bia ecc8.8266.d604)

  Description: MSGMERGF1

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

     reliability 255/255, txload 11/255, rxload 10/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

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

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 2w4d, output hang never

  Last clearing of "show interface" counters 00:17:11

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4237333967

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

[Leo Laohoo]

Can you please post the output to the command "sh controller e Fa1/0/2" please?

[highmiles2]

SW-MIS-02#sh controllers ethernet-controller fastEthernet 1/0/2

     Transmit FastEthernet1/0/2               Receive
   4131274693 Bytes                        756627405 Bytes
    583239588 Unicast frames               956800308 Unicast frames
     20424850 Multicast frames                     0 Multicast frames
        67873 Broadcast frames                  1580 Broadcast frames
            0 Too old frames               756526285 Unicast bytes
            0 Deferred frames                      0 Multicast bytes
            0 MTU exceeded frames             101120 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames           719020450 Minimum size frames
            0 8 collision frames          1969836560 65 to 127 byte frames
            0 9 collision frames           176862349 128 to 255 byte frames
            0 10 collision frames          246901816 256 to 511 byte frames
            0 11 collision frames          261129932 512 to 1023 byte frames
            0 12 collision frames         1878018077 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
   1024105859 64 byte frames                       0 Valid frames, too small
   1423130552 127 byte frames
    299623819 255 byte frames                      0 Too old frames
    171939440 511 byte frames                      0 Valid oversize frames
    256164639 1023 byte frames                     0 System FCS error frames
   1723735298 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

SW-MIS-02#

SW-MIS-02#sh int fastEthernet 1/0/2

FastEthernet1/0/2 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is ecc8.8266.d604 (bia ecc8.8266.d604)

  Description: MSGMERGF1

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

     reliability 255/255, txload 13/255, rxload 12/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

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

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 2w5d, output hang never

  Last clearing of "show interface" counters 00:03:46

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4237003919

-----------------------------

SW-MIS-02#sh int fastEthernet 1/0/2

FastEthernet1/0/2 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is ecc8.8266.d604 (bia ecc8.8266.d604)

  Description: MSGMERGF1

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

     reliability 255/255, txload 13/255, rxload 12/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Full-duplex, 100Mb/s, media type is 10/100BaseTX

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

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input never, output 2w5d, output hang never

  Last clearing of "show interface" counters 00:03:51

  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5380

[highmiles2]

Ok, so it looks like this is a known bug, # CSCtq86186 on 12.2.58 with a stack of 3750
Bug Details

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtq86186%20%20

further:

http://thwack.solarwinds.com/forums/48/network-management/9/orion-network-performance-monitor/31782/incorrect-discard-counts-on-ci/

Thanks Leolaohoo