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Interface output drop but can't notice any congestion

admnet_senaisc
Level 1
Level 1

‎06-06-2018 10:16 AM - edited ‎03-08-2019 03:16 PM

Hi people!

 

We've a problem with one of our distribution switches which is that on some interfaces we're seeing output drops from time to time without any reasonable cause that i was able to identify.

 

I'm not an expert on Cisco switching so any help would be appreciated.

 

I'm wondering if it may be associated with an error on the onther endpoint or maybe because a flow control enabled on the other side, even if it's disabled on the switch's interface.

 

The QoS (mls qos) is disabled on the switch.

 

I'll start with some information that IMO can summarize the subject:

 

#show interfaces gigabitEthernet 1/0/2
GigabitEthernet1/0/2 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is a055.4fb5.c482 (bia a055.4fb5.c482)
  Description: Port-Channel07
  MTU 9198 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 165/255, rxload 27/255
  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 00:00:05, output 00:00:07, output hang never
  Last clearing of "show interface" counters 2w5d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1796101
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 106949000 bits/sec, 48499 packets/sec
  30 second output rate 647867000 bits/sec, 69551 packets/sec
     21783579261 packets input, 8183217062716 bytes, 0 no buffer
     Received 1282650 broadcasts (1281861 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1281861 multicast, 0 pause input
     0 input packets with dribble condition detected
     30984249833 packets output, 33722470553859 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 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
 
Some time after you can see that the drops increased but i can't see any reasonable cause for that as the bandwidht rate is near of 50% of use.
 
show interfaces gigabitEthernet 1/0/2
GigabitEthernet1/0/2 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is a055.4fb5.c482 (bia a055.4fb5.c482)
  Description: ## P07 ##
  MTU 9198 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 166/255, rxload 27/255
  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 00:00:05, output 00:00:00, output hang never
  Last clearing of "show interface" counters 2w5d
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1796118
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  30 second input rate 106680000 bits/sec, 48429 packets/sec
  30 second output rate 651155000 bits/sec, 69719 packets/sec
     21783625532 packets input, 8183228790614 bytes, 0 no buffer
     Received 1282650 broadcasts (1281861 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 1281861 multicast, 0 pause input
     0 input packets with dribble condition detected
     30984323668 packets output, 33722559437481 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 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
 
The interface Gi1/0/2 in on ASIC0:
 
interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Gi1/0/1 1 1 1 0/2 1 1 1 local Yes Yes
Gi1/0/2 2 2 2 0/1 1 2 2 local Yes Yes
Gi1/0/3 3 3 3 0/4 1 3 3 local Yes Yes
Gi1/0/4 4 4 4 0/3 1 4 4 local Yes Yes
Gi1/0/5 5 5 5 0/6 1 5 5 local Yes Yes
Gi1/0/6 6 6 6 0/5 1 6 6 local Yes Yes
Gi1/0/7 7 7 7 0/8 1 7 7 local Yes Yes
Gi1/0/8 8 8 8 0/7 1 8 8 local Yes Yes
Gi1/0/9 9 9 9 0/10 1 9 9 local Yes Yes
Gi1/0/10 10 10 10 0/9 1 10 10 local Yes Yes
Gi1/0/11 11 11 11 0/12 1 11 11 local Yes Yes
Gi1/0/12 12 12 12 0/11 1 12 12 local Yes Yes
Gi1/0/13 13 13 13 0/16 1 13 13 local Yes Yes
Gi1/0/14 14 14 14 0/15 1 14 14 local Yes Yes
Gi1/0/15 15 15 15 0/18 1 15 15 local Yes Yes
Gi1/0/16 16 16 16 0/17 1 16 16 local Yes Yes
Gi1/0/17 17 17 17 0/20 1 17 17 local Yes Yes
Gi1/0/18 18 18 18 0/19 1 18 18 local Yes Yes
Gi1/0/19 19 19 19 0/22 1 19 19 local Yes Yes
Gi1/0/20 20 20 20 0/21 1 20 20 local Yes Yes
Gi1/0/21 21 21 21 0/24 1 21 21 local Yes Yes
Gi1/0/22 22 22 22 0/23 1 22 22 local Yes Yes
Gi1/0/23 23 23 23 0/26 1 23 23 local Yes Yes
Gi1/0/24 24 24 24 0/25 1 24 24 local Yes Yes
Gi1/0/25 25 25 25 1/2 1 25 25 local Yes Yes
Gi1/0/26 26 26 26 1/1 1 26 26 local Yes Yes
Gi1/0/27 27 27 27 1/4 1 27 27 local Yes Yes
Gi1/0/28 28 28 28 1/3 1 28 28 local Yes Yes
Gi1/0/29 29 29 29 1/6 1 29 29 local Yes Yes
Gi1/0/30 30 30 30 1/5 1 30 30 local Yes Yes
Gi1/0/31 31 31 31 1/8 1 31 31 local Yes Yes
Gi1/0/32 32 32 32 1/7 1 32 32 local Yes Yes
Gi1/0/33 33 33 33 1/10 1 33 33 local Yes Yes
Gi1/0/34 34 34 34 1/9 1 34 34 local Yes Yes

interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Gi1/0/35 35 35 35 1/12 1 35 35 local Yes Yes
Gi1/0/36 36 36 36 1/11 1 36 36 local Yes Yes
Gi1/0/37 37 37 37 1/16 1 37 37 local Yes Yes
Gi1/0/38 38 38 38 1/15 1 38 38 local Yes Yes
Gi1/0/39 39 39 39 1/18 1 39 39 local Yes Yes
Gi1/0/40 40 40 40 1/17 1 40 40 local Yes Yes
Gi1/0/41 41 41 41 1/20 1 41 41 local Yes Yes
Gi1/0/42 42 42 42 1/19 1 42 42 local Yes Yes
Gi1/0/43 43 43 43 1/22 1 43 43 local Yes Yes
Gi1/0/44 44 44 44 1/21 1 44 44 local Yes Yes
Gi1/0/45 45 45 45 1/24 1 45 45 local Yes Yes
Gi1/0/46 46 46 46 1/23 1 46 46 local Yes Yes
Gi1/0/47 47 47 47 1/26 1 47 47 local Yes Yes
Gi1/0/48 48 48 48 1/25 1 48 48 local Yes Yes
Gi1/0/49 49 49 49 0/13 1 49 49 local Yes Yes
Gi1/0/50 50 50 50 1/13 1 50 50 local Yes Yes
Te1/0/1 51 51 51 0/0 1 1 51 local Yes Yes
Te1/0/2 52 52 52 1/0 1 2 52 local Yes Yes
Gi2/0/1 57 57 1 1/2 2 1 1 remote No Yes
Gi2/0/2 58 58 2 1/1 2 2 2 remote No Yes
Gi2/0/3 59 59 3 1/4 2 3 3 remote No Yes
Gi2/0/4 60 60 4 1/3 2 4 4 remote No Yes
Gi2/0/5 61 61 5 1/6 2 5 5 remote No Yes
Gi2/0/6 62 62 6 1/5 2 6 6 remote No Yes
Gi2/0/7 63 63 7 1/8 2 7 7 remote No Yes
Gi2/0/8 64 64 8 1/7 2 8 8 remote No Yes
Gi2/0/9 65 65 9 1/10 2 9 9 remote No Yes
Gi2/0/10 66 66 10 1/9 2 10 10 remote No Yes
Gi2/0/11 67 67 11 1/12 2 11 11 remote No Yes
Gi2/0/12 68 68 12 1/11 2 12 12 remote No Yes
Gi2/0/13 69 69 13 1/16 2 13 13 remote No Yes
Gi2/0/14 70 70 14 1/15 2 14 14 remote No Yes
Gi2/0/15 71 71 15 1/18 2 15 15 remote No Yes
Gi2/0/16 72 72 16 1/17 2 16 16 remote No Yes
Gi2/0/17 73 73 17 1/20 2 17 17 remote No Yes
Gi2/0/18 74 74 18 1/19 2 18 18 remote No Yes
Gi2/0/19 75 75 19 1/22 2 19 19 remote No Yes

interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Gi2/0/20 76 76 20 1/21 2 20 20 remote No Yes
Gi2/0/21 77 77 21 1/24 2 21 21 remote No Yes
Gi2/0/22 78 78 22 1/23 2 22 22 remote No Yes
Gi2/0/23 79 79 23 1/26 2 23 23 remote No Yes
Gi2/0/24 80 80 24 1/25 2 24 24 remote No Yes
Gi2/0/25 81 81 25 0/13 2 25 25 remote No Yes
Gi2/0/26 82 82 26 1/13 2 26 26 remote No Yes
Te2/0/1 83 83 27 0/0 2 1 27 remote No Yes
Te2/0/2 84 84 28 1/0 2 2 28 remote No Yes
Po1 456 456 0 1/0 9 1 1 local No No
Po2 464 464 0 1/0 9 2 2 local No No
Po3 472 472 0 1/0 9 3 3 local No No
Po4 480 480 0 0/0 9 4 4 local No No
Po5 488 488 0 0/0 9 5 5 local No No
Po7 504 504 0 0/0 9 7 7 local No No
Po8 512 512 0 0/0 9 8 8 local No No
Po9 520 520 0 0/0 9 9 9 local No No
Po10 528 528 0 0/0 9 10 10 local No No
Po11 536 536 0 0/0 9 11 11 local No No
Po12 544 544 0 0/0 9 12 12 local No No
Po13 552 552 0 0/0 9 13 13 local No No
Po14 560 560 0 0/0 9 14 14 local No No
St1 840 840 0 16/0 1 0 0 internal Yes Yes
St2 841 841 0 16/0 2 0 0 internal No Yes
 
One thing that i find curious is that ASIC 0 has a lot of Sup Queue Drops (i couldn't find any reference on Cisco documentation about it and i'm not sure of what  it does means)
 
===========================================================================
 Switch 1, PortASIC 0 Statistics
---------------------------------------------------------------------------
 
         0 TxBufferFull Drop Count
         0 TxBufferFrameDesc BadCrc16
         0 TxBuffer Bandwidth Drop Cou
         0 TxQueue Bandwidth Drop Coun
         0 TxQueue Missed Drop Statist
         0 RxBuffer Drop DestIndex Cou
2430135840 SneakQueue Drop Count
      1665 Learning Queue Overflow Fra
         0 TxBufferFrameDesc BadCrc16            0 Rx NP Packet Count0
         0 RxBuffer Drop DestIndex Cou   564428072 Rx NP Packet Count1
 
         0 Sup Queue 0 Drop Frames         8243917 Sup Queue 8 Drop Frames
         0 Sup Queue 1 Drop Frames               0 Sup Queue 9 Drop Frames
         0 Sup Queue 2 Drop Frames           72738 Sup Queue 10 Drop Frames
  12200265 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 TxBufferFull Drop Count
         0 TxBufferFrameDesc BadCrc16
         0 TxBuffer Bandwidth Drop Cou
         0 TxQueue Bandwidth Drop Coun
         0 TxQueue Missed Drop Statist
         0 RxBuffer Drop DestIndex Cou
     60668 SneakQueue Drop Count
        86 Learning Queue Overflow Fra
         0 TxBufferFrameDesc BadCrc16            0 Rx NP Packet Count0
         0 RxBuffer Drop DestIndex Cou  3645698246 Rx NP Packet Count1
 
         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
 
Some other information:

Transmit FastEthernet0 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


Transmit GigabitEthernet1/0/1 Receive
816704594 Bytes 266293114 Bytes
3743705981 Unicast frames 221885479 Unicast frames
20240699 Multicast frames 0 Multicast frames
96419753 Broadcast frames 37 Broadcast frames
0 Too old frames 266290746 Unicast bytes
0 Deferred frames 0 Multicast bytes
0 MTU exceeded frames 2368 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 343294 Minimum size frames
0 8 collision frames 185996469 65 to 127 byte frames
0 9 collision frames 34541892 128 to 255 byte frames
0 10 collision frames 834673 256 to 511 byte frames
0 11 collision frames 77604 512 to 1023 byte frames
0 12 collision frames 91584 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
395124052 64 byte frames 0 Valid frames, too small
1983800157 127 byte frames
404490384 255 byte frames 0 Too old frames
193932063 511 byte frames 0 Valid oversize frames
147983195 1023 byte frames 0 System FCS error frames
735036582 1518 byte frames 0 RxPortFifoFull drop frame
0 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames


Transmit GigabitEthernet1/0/2 Receive
3597809348 Bytes 877737043 Bytes
485503000 Unicast frames 3799928752 Unicast frames
89704739 Multicast frames 33528838 Multicast frames
10445756 Broadcast frames 1106255765 Broadcast frames
0 Too old frames 2408303475 Unicast bytes
0 Deferred frames 2617433846 Multicast bytes
0 MTU exceeded frames 2080892224 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 4158461880 Minimum size frames

Port-asic Port Drop Statistics - Summary
========================================
Port 0 TxQueue Drop Stats: 0
Port 1 TxQueue Drop Stats: 464927153
Port 2 TxQueue Drop Stats: 923
Port 3 TxQueue Drop Stats: 0
Port 4 TxQueue Drop Stats: 3516871287
Port 5 TxQueue Drop Stats: 35621784
Port 6 TxQueue Drop Stats: 917731
Port 7 TxQueue Drop Stats: 13812
Port 8 TxQueue Drop Stats: 0
Port 9 TxQueue Drop Stats: 14019
Port 10 TxQueue Drop Stats: 0
Port 11 TxQueue Drop Stats: 80036
Port 12 TxQueue Drop Stats: 49387
Port 13 TxQueue Drop Stats: 0
Port 14 TxQueue Drop Stats: 0
Port 15 TxQueue Drop Stats: 100770
Port 16 TxQueue Drop Stats: 41957958
Port 17 TxQueue Drop Stats: 13877073
Port 18 TxQueue Drop Stats: 0
Port 19 TxQueue Drop Stats: 348819
Port 20 TxQueue Drop Stats: 0
Port 21 TxQueue Drop Stats: 143
Port 22 TxQueue Drop Stats: 0
Port 23 TxQueue Drop Stats: 6370712
Port 24 TxQueue Drop Stats: 0
Port 25 TxQueue Drop Stats: 105
Port 26 TxQueue Drop Stats: 13378
Port 27 TxQueue Drop Stats: 0

Supervisor TxQueue Drop Statistics
Queue 0: 0
Queue 1: 0
Queue 2: 0
Queue 3: 12200265
Queue 4: 0
Queue 5: 0
Queue 6: 0
Queue 7: 0
Queue 8: 8243912
Queue 9: 0
Queue 10: 72738
Queue 11: 0
Queue 12: 0
Queue 13: 0
Queue 14: 0
Queue 15: 0

Port-asic Port Drop Statistics - Details
========================================

Port 0 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 1 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 464927177

Port 2 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 923

Port 3 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 4 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 9552
Weight 1 Frames 7
Weight 2 Frames 1
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 3516861727

Port 5 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 35621784

Port 6 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 917731

Port 7 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 13812

Port 8 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 9 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 14019

Port 10 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 11 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 63784
Weight 1 Frames 826
Weight 2 Frames 1
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 15425

Port 12 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 49387

Port 13 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 14 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 4
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 5
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 15 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 100770

Port 16 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 41957958

Port 17 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 13877073

Port 18 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 3
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0

Port 19 TxQueue Drop Statistics
Queue 0
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 1
Weight 0 Frames 0
Weight 1 Frames 0
Weight 2 Frames 0
Queue 2
Weight 0 Frames 0
 
===========================================================================
Switch 1, PortASIC 0 Statistics
---------------------------------------------------------------------------

0 TxBufferFull Drop Count
0 TxBufferFrameDesc BadCrc16
0 TxBuffer Bandwidth Drop Cou
0 TxQueue Bandwidth Drop Coun
0 TxQueue Missed Drop Statist
0 RxBuffer Drop DestIndex Cou
2430135840 SneakQueue Drop Count
1665 Learning Queue Overflow Fra
0 TxBufferFrameDesc BadCrc16 0 Rx NP Packet Count0
0 RxBuffer Drop DestIndex Cou 564424419 Rx NP Packet Count1

0 Sup Queue 0 Drop Frames 8243912 Sup Queue 8 Drop Frames
0 Sup Queue 1 Drop Frames 0 Sup Queue 9 Drop Frames
0 Sup Queue 2 Drop Frames 72738 Sup Queue 10 Drop Frames
12200265 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 TxBufferFull Drop Count
0 TxBufferFrameDesc BadCrc16
0 TxBuffer Bandwidth Drop Cou
0 TxQueue Bandwidth Drop Coun
0 TxQueue Missed Drop Statist
0 RxBuffer Drop DestIndex Cou
60668 SneakQueue Drop Count
86 Learning Queue Overflow Fra
0 TxBufferFrameDesc BadCrc16 0 Rx NP Packet Count0
0 RxBuffer Drop DestIndex Cou 3531043573 Rx NP Packet Count1

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
Labels:
0 Helpful
4 Replies 4

Larry Sullivan
Level 3
Level 3

‎06-06-2018 02:45 PM

1) What Model switch and what IOS version?

2) Do the drops seem to be service impacting?

0 Helpful

admnet_senaisc
Level 1
Level 1
In response to Larry Sullivan

‎06-07-2018 04:40 AM - edited ‎06-07-2018 05:49 AM

Hello Larry!

 

We can't notice a huge impact, for sure. But i can't be sure how much it affects our network. It's a critical point because it uplinks to a router that provides Internet to our company. It's connected through a port-channel and both interfaces in the port-channel are having those output drops.

 

I really want to understand what is happening. I suspect that ASIC0 may be oversubscribed. 

 

Cisco IOS Software, C2960X Software (C2960X-UNIVERSALK9-M), Version 15.2(2)E3, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2015 by Cisco Systems, Inc.
Compiled Wed 26-Aug-15 07:12 by prod_rel_team

ROM: Bootstrap program is C2960X boot loader
BOOTLDR: C2960X Boot Loader (C2960X-HBOOT-M) Version 15.2(2r)E1, RELEASE SOFTWARE (fc1)

uptime is 2 years, 21 weeks, 2 days, 21 hours, 17 minutes
System returned to ROM by power-on
System restarted at 11:16:02 BR Sat Jan 9 2016
System image file is "flash:/c2960x-universalk9-mz.152-2.E3.bin"
Last reload reason: power-on



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
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agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

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http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
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cisco WS-C2960X-48TD-L (APM86XXX) processor (revision G0) with 524288K bytes of memory.
Processor board ID 
Last reset from power-on
1 Virtual Ethernet interface
1 FastEthernet interface
76 Gigabit Ethernet interfaces
4 Ten Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.

512K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address       : 
Motherboard assembly number     :
Power supply part number        : 
Motherboard serial number       : 
Power supply serial number      : 
Model revision number           : G0
Motherboard revision number     : B0
Model number                    : WS-C2960X-48TD-L
Daughterboard assembly number   : 
Daughterboard serial number     :
System serial number            : 
Top Assembly Part Number        : 
Top Assembly Revision Number    : C0
Version ID                      : V03
CLEI Code Number                : 
Daughterboard revision number   : A0
Hardware Board Revision Number  : 0x12


Switch Ports Model                     SW Version            SW Image
------ ----- -----                     ----------            ----------
*    1 52    WS-C2960X-48TD-L          15.2(2)E3             C2960X-UNIVERSALK9-M
     2 28    WS-C2960X-24TD-L          15.2(2)E3             C2960X-UNIVERSALK9-M


Switch 02
---------
Switch Uptime                   : 22 weeks, 6 days, 20 hours, 52 minutes
Base ethernet MAC Address       : 
Motherboard assembly number     : 
Power supply part number        : 
Motherboard serial number       : 
Power supply serial number      :
Model revision number           : G0
Motherboard revision number     : B0
Model number                    : WS-C2960X-24TD-L
Daughterboard assembly number   : 
Daughterboard serial number     : 
System serial number            : 
Top assembly part number        :
Top assembly revision number    : B0
Version ID                      : V03
CLEI Code Number                : 
Daughterboard revision number   : A0

Configuration register is 0xF

 

 

0 Helpful

Larry Sullivan
Level 3
Level 3
In response to admnet_senaisc

‎06-07-2018 10:17 AM

If you're not sure if it is impacting service, it likely isn't.  We have had high discard reporting with our stacked 3850s.  Not sure if the 2960Xs are the same issue though.  Fix for us was to update the IOS.  You seem to have a relatively up to date IOS though.  If the discards really bother you, I would at least try an upgraded IOS if convenient.  

0 Helpful

admnet_senaisc
Level 1
Level 1
In response to Larry Sullivan

‎06-08-2018 09:55 AM

Hello Larry,

Thanks for your time!

In the meantime i'll take a look at it.

I'm still trying to understand the root cause of those drops.

I lack the knowledge to assertively associate the interface's output drop with the ASICS's drops, but i still think that there's something awkward there.
0 Helpful
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