Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Catalyst 2960 - total output drops

I have a Catalyst Switch that is been used as a SAN switch providing ISCSI connection for servers.

The total output drops of the interfaces connected to the SAN and some connected to the servers keep increasing.

Example below:

SWESAN1-1#sh interfaces gigabitEthernet 0/1

GigabitEthernet0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is ec44.763c.8f01 (bia ec44.763c.8f01)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 5/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, 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 00:00:08, output hang never
Last clearing of "show interface" counters 03:25:04
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 78
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 22322000 bits/sec, 2171 packets/sec
5 minute output rate 5155000 bits/sec, 1487 packets/sec
20441503 packets input, 23941254166 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
16323602 packets output, 9608971046 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

I can see drops in asic, output below:

SWESAN1-1#sh controllers ethernet-controller port-asic statistics
===========================================================================
  Switch 1, PortASIC 0 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
  288629969 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
    8954324 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
   58585288 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
          0 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


          0 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          0 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 1 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
    4214704 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


          0 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          6 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 2 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
  560800531 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


      49813 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          8 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 3 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
  524719313 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


      49813 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          0 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 4 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
3789492245 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


     383406 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          2 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 5 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
3056068040 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1513783 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          4 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 6 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
2749832897 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1513985 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          0 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 7 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
  887418050 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1688635 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          4 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 8 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
3508791341 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1689282 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          2 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   
          
          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 9 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
2141763367 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1803003 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          2 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 10 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
   32175288 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    1803003 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
    9261063 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames  
===========================================================================
  Switch 1, PortASIC 11 Statistics
---------------------------------------------------------------------------
          0 RxQ-0, wt-0 enqueue frames            0 RxQ-0, wt-0 drop frames   
         52 RxQ-0, wt-1 enqueue frames            0 RxQ-0, wt-1 drop frames   
          0 RxQ-0, wt-2 enqueue frames            0 RxQ-0, wt-2 drop frames   

          0 RxQ-1, wt-0 enqueue frames            0 RxQ-1, wt-0 drop frames   
          0 RxQ-1, wt-1 enqueue frames            0 RxQ-1, wt-1 drop frames   
          0 RxQ-1, wt-2 enqueue frames            0 RxQ-1, wt-2 drop frames   

          0 RxQ-2, wt-0 enqueue frames            0 RxQ-2, wt-0 drop frames   
          0 RxQ-2, wt-1 enqueue frames            0 RxQ-2, wt-1 drop frames   
1956940712 RxQ-2, wt-2 enqueue frames            0 RxQ-2, wt-2 drop frames   

          0 RxQ-3, wt-0 enqueue frames            0 RxQ-3, wt-0 drop frames   
          0 RxQ-3, wt-1 enqueue frames            0 RxQ-3, wt-1 drop frames   
          0 RxQ-3, wt-2 enqueue frames            0 RxQ-3, wt-2 drop frames   


    3094229 TxQueue Drop Stats        
          0 TxBufferFull Drop Count               0 Rx Fcs Error Frames       
          0 TxBufferFrameDesc BadCrc16            0 Rx Invalid Oversize Frames
          0 TxBuffer Bandwidth Drop Cou           0 Rx Invalid Too Large Frames
          0 TxQueue Bandwidth Drop Coun           0 Rx Invalid Too Large Frames
          0 TxQueue Missed Drop Statist           0 Rx Invalid Too Small Frames
          1 RxBuffer Drop DestIndex Cou           0 Rx Too Old Frames         
          0 SneakQueue Drop Count                 0 Tx Too Old Frames         
          0 Learning Queue Overflow Fra           0 System Fcs Error Frames   
          0 Learning Cam Skip Count   

          0 Sup Queue 0 Drop Frames               0 Sup Queue 8 Drop Frames   
          0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames   
          0 Sup Queue 2 Drop Frames               0 Sup Queue 10 Drop Frames  
          0 Sup Queue 3 Drop Frames               0 Sup Queue 11 Drop Frames  
          0 Sup Queue 4 Drop Frames               0 Sup Queue 12 Drop Frames  
          0 Sup Queue 5 Drop Frames               0 Sup Queue 13 Drop Frames  
          0 Sup Queue 6 Drop Frames               0 Sup Queue 14 Drop Frames  
          0 Sup Queue 7 Drop Frames               0 Sup Queue 15 Drop Frames

More details about Gigabit0/1

SWESAN1-1#     sh controllers ethernet-controller gigabitEthernet 0/1

      Transmit GigabitEthernet0/1              Receive
    3482787835 Bytes                       3778890341 Bytes                   
    2998540588 Unicast frames               717044389 Unicast frames          
       2161622 Multicast frames                     4 Multicast frames        
      46268260 Broadcast frames                    13 Broadcast frames        
             0 Too old frames              3778886916 Unicast bytes           
             0 Deferred frames                    486 Multicast bytes         
             0 MTU exceeded frames                832 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                 120 Minimum size frames     
             0 8 collision frames          1283051631 65 to 127 byte frames   
             0 9 collision frames            94606574 128 to 255 byte frames  
             0 10 collision frames          246225257 256 to 511 byte frames  
             0 11 collision frames           51393945 512 to 1023 byte frames 
             0 12 collision frames         3336734176 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                 2 Symbol error frames     
             0 Late collisions                      1 Invalid frames, too large
             0 VLAN discard frames                  0 Valid frames, too large 
             0 Excess defer frames                  0 Invalid frames, too small
      49422215 64 byte frames                       0 Valid frames, too small 
     267433289 127 byte frames         
      24690490 255 byte frames                      0 Too old frames          
      25794388 511 byte frames                      0 Valid oversize frames   
     150026743 1023 byte frames                     0 System FCS error frames 
    2529603345 1518 byte frames                     0 RxPortFifoFull drop frame
             0 Too large frames        
             0 Good (1 coll) frames    
             0 Good (>1 coll) frames

For a second, I though that I had found my solution when I stunble into this

https://supportforums.cisco.com/thread/2111188?referring_site=kapi however the bug mentioned on that thread is just for 12.2(58) and later and I am actually running 12.2(53)

For the record QOS is disabled

Am I facing a hardware limitation? is there anything that I could do to improve performance?

Thanks for reading,

Fabio

4 REPLIES
Super Bronze

Catalyst 2960 - total output drops

Disclaimer

The    Author of this posting offers the information contained within this    posting without consideration and with the reader's understanding that    there's no implied or expressed suitability or fitness for any  purpose.   Information provided is for informational purposes only and  should not   be construed as rendering professional advice of any kind.  Usage of  this  posting's information is solely at reader's own risk.

Liability Disclaimer

In    no event shall Author be liable for any damages whatsoever  (including,   without limitation, damages for loss of use, data or  profit) arising  out  of the use or inability to use the posting's  information even if  Author  has been advised of the possibility of such  damage.

Posting

The most common cause of interface drops is over subscription of available bandwidth.  If the over subscription is transitory, you can sometimes increase buffering/queuing, which often decreases drops but increases latency.  (Your SAN traffic might not be too happy with that either.)

If the over subscription is sustained, and you have no other flow control options (e.g. ECN, Ethernet full duplex flow control, etc.), best you can do is to "optimally" drop packets.  ("Optimally" is dropping the fewest packets possible to regulate overall rate to available bandwidth.)

Your only other choice to deal with sustained over subscription is to increase bandwidth, which considering SAN traffic (w/o something like enhanced Ethernet) is probably your best/necessary option unless you have a mixture of traffic.  Then using QoS you might be able to treat SAN differently and provide it the bandwidth it needs; other traffic would still be dropped.

Hall of Fame Super Gold

Catalyst 2960 - total output drops

Last clearing of "show interface" counters 03:25:04

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 78

Nothing out of the ordinary except this.

New Member

Catalyst 2960 - total output drops

Hey Leolaohoo thank you very much for taking the time. What you mentioned above is exactly the reason for this discussion... Basically the total output drops of the interfaces connected to the SAN have big output drops.

The interface Gig0/1 above has been cleared the counters hence the number is small + the heavy activity on the SAN had ceased.

Don't you find strange the amount of drops shown on most ASIC ports?

Cheers,

Fabio

New Member

Catalyst 2960 - total output drops

Hi Joseph,

Thanks for the post. It's a dedicated SAN switch, other than the management vlan there is nothing else.

There is no QOS the switch is doing FIFO.

Joseph at the moment we only have storm-controlI set on the interfaces restricting broadcast traffic. 'll give it a crack at the flow control option, thanks for pointing that out!

Cheers,

Fabio

3700
Views
3
Helpful
4
Replies
CreatePlease login to create content