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Errors on Disabled Port

Rajeev Ranjan
Level 1
Level 1

Hi Friends,

I am getting output drops on disabled port after IOS image upgradation to c2960-lanbasek9-mz.122-37.SE1.bin. We are using this crypto image on all switches.We are not getting errors. This is surprising to see output drops on these port. Please help me.

8 Replies 8

Eehab Suliman
Level 1
Level 1

Please "clear counters" on this specific interface and see if they are incrementing.

My guess the drops were registered at a point in time the interface was up. Please let me know.

Hi Eehab,

I am  not using affected port.It was shut and assigned to different VLAN which we are not using since a month ago.This happens just after IOS image upgradation.

Sorry for late replying. Errors are incrementing after counter clear. Kindly help.

Please provide output to the following command:

1.  sh interface ; and

2.  sh controller ether

Hi,

Kindly find the output.

SW>sh int gi0/45
GigabitEthernet0/45 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is 001b.2ae7.012d (bia 001b.2ae7.012d)
    MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 1000Mb/s, link type is auto, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, output hang never
  Last clearing of "show interface" counters 21:01:18
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 54905
  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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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

SW>sh controller ether gi0/45

     Transmit GigabitEthernet0/45             Receive
            0 Bytes                                0 Bytes
            0 Unicast frames                       0 Unicast frames
            0 Multicast frames                     0 Multicast frames
            0 Broadcast frames                     0 Broadcast frames
            0 Too old frames                       0 Unicast bytes
            0 Deferred frames                      0 Multicast bytes
            0 MTU exceeded frames                  0 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                   0 Minimum size frames
            0 8 collision frames                   0 65 to 127 byte frames
            0 9 collision frames                   0 128 to 255 byte frames
            0 10 collision frames                  0 256 to 511 byte frames
            0 11 collision frames                  0 512 to 1023 byte frames
            0 12 collision frames                  0 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
            0 64 byte frames                       0 Valid frames, too small
            0 127 byte frames
            0 255 byte frames                      0 Too old frames
            0 511 byte frames                      0 Valid oversize frames
            0 1023 byte frames                     0 System FCS error frames
            0 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

Currently there is nothing connected to this port.

Errrr ... The interface counters you've posted is down.  Nothing for me to analyze.

Thats why i contacted you. Even i didnt understand why i am getting output drops on notconnected port/Disable port. if you need some other output then kinldy tell me and help me out.

to c2960-lanbasek9-mz.122-37.SE1.bin

This could be the culprit.  Have you tried a more recent IOS?  Like 12.2(55)SE2 or later?