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Cisco 2960S increasing total output drops

M.S.88
Level 1
Level 1

‎05-12-2021 04:43 AM

Hi all,

i just saw problem with increasing total output drops on interfaces at cat 2960s (WS-C2960S-48LPD-L ver. 12.2(55)SE8)

problem is on every connected interfaces, some with ip phones others with PCs and uplink interface, everywhere total output drops are growing..

 

have You ever met this problem?

i think this is cause of some dropped calls, am I right?

Can you give me tips to solve this problem, is it something with buffers?

 

some output from 2960

SW_01_FN#sh cdp neighbors
[...]
SEPXXXXXXXX03B4  Gig 1/0/40        160             H P M  IP Phone  Port 1
SW_CORE          Ten 1/0/1         159             R S I  WS-C4900M Ten 1/8


SW_01_FN#sh interfaces Ten 1/0/1 controller
TenGigabitEthernet1/0/1 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet, address is 8890.8d77.9cb3 (bia 8890.8d77.9cb3)
  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-LR
  input flow-control is off, output 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 never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 6396000 bits/sec, 627 packets/sec
  5 minute output rate 171000 bits/sec, 146 packets/sec
     23432326619 packets input, 29414699465995 bytes, 0 no buffer
     Received 528643405 broadcasts (282821393 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 282821393 multicast, 0 pause input
     0 input packets with dribble condition detected
     1997392176 packets output, 822116387140 bytes, 0 underruns
     0 output errors, 0 collisions, 1 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

     Transmit TenGigabitEthernet1/0/1         Receive
 822116389017 Bytes                     827397147767 Bytes
   1989069832 Unicast frames              1428846739 Unicast frames
      5007536 Multicast frames             282821405 Multicast frames
      3314816 Broadcast frames             245822014 Broadcast frames
            0 Too old frames            674820523933 Unicast bytes
            0 Deferred frames            44251232199 Multicast bytes
            0 MTU exceeded frames        22901356306 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           888216750 Minimum size frames
            0 8 collision frames          2822799945 65 to 127 byte frames
            0 9 collision frames           377699383 128 to 255 byte frames
            0 10 collision frames          164511705 256 to 511 byte frames
            0 11 collision frames          185105648 512 to 1023 byte frames
            0 12 collision frames          663030773 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         1151093250 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
    199377653 64 byte frames                       0 Valid frames, too small
   1028036295 127 byte frames
    215058938 255 byte frames                      0 Too old frames
     88988489 511 byte frames                      0 Valid oversize frames
     52752833 1023 byte frames                     0 System FCS error frames
    246455608 1518 byte frames                     0 RxPortFifoFull drop frame
    166722368 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

SW_01_FN# sh interfaces Gig 1/0/40 controller
GigabitEthernet1/0/40 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 8890.8d77.9ca8 (bia 8890.8d77.9ca8)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  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 00:00:09, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 231416
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 5000 bits/sec, 3 packets/sec
  5 minute output rate 12000 bits/sec, 4 packets/sec
     248863550 packets input, 37639854880 bytes, 0 no buffer
     Received 674016 broadcasts (579901 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 579901 multicast, 0 pause input
     0 input packets with dribble condition detected
     526136126 packets output, 165314024666 bytes, 0 underruns
     0 output errors, 0 collisions, 1 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

     Transmit GigabitEthernet1/0/40           Receive
   2105267482 Bytes                       3280116512 Bytes
    296867166 Unicast frames               248189534 Unicast frames
     87118777 Multicast frames                579901 Multicast frames
    142150184 Broadcast frames                 94115 Broadcast frames
            0 Too old frames              3092616996 Unicast bytes
            0 Deferred frames              131085424 Multicast bytes
            0 MTU exceeded frames           24245840 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            21933060 Minimum size frames
            0 8 collision frames           182686025 65 to 127 byte frames
            0 9 collision frames            25693459 128 to 255 byte frames
            0 10 collision frames            6864426 256 to 511 byte frames
            0 11 collision frames            1920425 512 to 1023 byte frames
            0 12 collision frames            9766155 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
    257575518 64 byte frames                       0 Valid frames, too small
     90258302 127 byte frames
     58906139 255 byte frames                      0 Too old frames
     25052544 511 byte frames                      0 Valid oversize frames
     23721989 1023 byte frames                     0 System FCS error frames
     70621594 1518 byte frames                     0 RxPortFifoFull drop frame
           41 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

and from core switch:

SW_CORE#sh interfaces Ten 1/8 controller
TenGigabitEthernet1/8 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet Port, address is e4d3.f136.4c47 (bia e4d3.f136.4c47)
  Description: to SW_01_FN
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
  input flow-control is on, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:26, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 102000 bits/sec, 77 packets/sec
  5 minute output rate 2840000 bits/sec, 299 packets/sec
     462665429 packets input, 235060967683 bytes, 0 no buffer
     Received 1634562 broadcasts (1063950 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     17800634200 packets output, 25267179478970 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
SW_CORE#sh interfaces Ten 1/8 controller
TenGigabitEthernet1/8 is up, line protocol is up (connected)
  Hardware is Ten Gigabit Ethernet Port, address is e4d3.f136.4c47 (bia e4d3.f136.4c47)
  Description: to SW_01_FN
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
  input flow-control is on, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:02, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 101000 bits/sec, 76 packets/sec
  5 minute output rate 2807000 bits/sec, 296 packets/sec
     462665617 packets input, 235060998075 bytes, 0 no buffer
     Received 1634564 broadcasts (1063952 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     17800635050 packets output, 25267180360566 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

 

 

 

 

 

 

 

 

Labels:
0 Helpful
13 Replies 13

Leo Laohoo
Hall of Fame
Hall of Fame

‎05-12-2021 04:58 AM

Is QoS enabled on the 2960S?

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-12-2021 05:01 AM

No, i didn't configure any qos, we can say that it's working on default setting.

0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-12-2021 05:15 AM

@M.S.88 wrote:

No, i didn't configure any qos, we can say that it's working on default setting.

What is the output to the command "sh mls qos"?

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-12-2021 05:29 AM

just:

 

SW_01_FN#sh mls qos
QoS is disabled
QoS ip packet dscp rewrite is enabled

Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-12-2021 05:31 AM

Change the port speed to 100 Mbps and see if the Total Output Drops are still incrementing.

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-12-2021 05:44 AM

i already changed on another port - no result

 

GigabitEthernet1/0/45 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 6899.cd4d.532d (bia 6899.cd4d.532d)
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/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 00:00:11, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 84753
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 12000 bits/sec, 10 packets/sec
     3472208 packets input, 1424318488 bytes, 0 no buffer
     Received 588036 broadcasts (544627 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 544627 multicast, 0 pause input
     0 input packets with dribble condition detected
     306673165 packets output, 44678729498 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     115185 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

     Transmit GigabitEthernet1/0/45           Receive
   1729056916 Bytes                       1424318488 Bytes
      4880312 Unicast frames                 2884172 Unicast frames
    108685662 Multicast frames                544627 Multicast frames
    193107196 Broadcast frames                 43409 Broadcast frames
            0 Too old frames              1282604659 Unicast bytes
            0 Deferred frames              117652594 Multicast bytes
            0 MTU exceeded frames           13847156 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              221375 Minimum size frames
            0 8 collision frames               32034 65 to 127 byte frames
            0 9 collision frames             2201801 128 to 255 byte frames
            0 10 collision frames             184639 256 to 511 byte frames
            0 11 collision frames             402590 512 to 1023 byte frames
            0 12 collision frames             252313 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             177456 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
    185757745 64 byte frames                       0 Valid frames, too small
     56885890 127 byte frames
     34430209 255 byte frames                      0 Too old frames
      6882298 511 byte frames                      0 Valid oversize frames
     16147420 1023 byte frames                     0 System FCS error frames
      6522260 1518 byte frames                     0 RxPortFifoFull drop frame
        47348 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-12-2021 06:03 AM

@M.S.88 wrote:

i already changed on another port - no result

How would you know?  You haven't cleared the interface counters after changing the port speed.

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-12-2021 06:35 AM

changed and cleared on interface 40 dedicated for ip-phone

 

GigabitEthernet1/0/40 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 6899.cd4d.5328 (bia 6899.cd4d.5328)
  MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/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 00:00:56, output 00:00:00, output hang never
  Last clearing of "show interface" counters 00:16:44
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 37
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1000 bits/sec, 1 packets/sec
  5 minute output rate 35000 bits/sec, 2 packets/sec
     3087 packets input, 450612 bytes, 0 no buffer
     Received 60 broadcasts (60 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 60 multicast, 0 pause input
     0 input packets with dribble condition detected
     6604 packets output, 5594400 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

     Transmit GigabitEthernet1/0/40           Receive
   1745610430 Bytes                       3137566324 Bytes
    246044163 Unicast frames               176980884 Unicast frames
     93734761 Multicast frames                843080 Multicast frames
    154342553 Broadcast frames                179954 Broadcast frames
            0 Too old frames              2896150843 Unicast bytes
            0 Deferred frames              164257539 Multicast bytes
            0 MTU exceeded frames           34922044 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            14451012 Minimum size frames
            0 8 collision frames           126714348 65 to 127 byte frames
            0 9 collision frames            15150297 128 to 255 byte frames
            0 10 collision frames            3331959 256 to 511 byte frames
            0 11 collision frames            4582871 512 to 1023 byte frames
            0 12 collision frames           13728909 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                      0 Invalid frames, too large
            0 VLAN discard frames              44524 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
    150013884 64 byte frames                       0 Valid frames, too small
     73947400 127 byte frames
     51313610 255 byte frames                      0 Too old frames
     24679198 511 byte frames                      0 Valid oversize frames
     40070447 1023 byte frames                     0 System FCS error frames
    154008472 1518 byte frames                     0 RxPortFifoFull drop frame
        88466 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-12-2021 06:47 AM

Can you explain what that downstream client is? 

Total Output Drops means the switch is feeding data downstream but the downstream client is sending "pause" frames back to the switch.  When the switch receives the pause frames the data, meant for the downstream client, is held in a bucket.  Once that bucket gets full, subsequent incoming data is discarded, hence Total Output Drop.  

This means the downstream client does not have the capacity to process the incoming data.  

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-12-2021 11:45 PM

Downstream client is Cisco ip phone 8865 with 1G port

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Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-13-2021 01:07 AM

@M.S.88 wrote:

Downstream client is Cisco ip phone 8865 with 1G port

Is there a computer connected to the phone?

0 Helpful

M.S.88
Level 1
Level 1
In response to Leo Laohoo

‎05-13-2021 01:49 AM

yes on port GigabitEthernet1/0/40 it is, but on port GigabitEthernet1/0/45 isn't and i have drops on both.

0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to M.S.88

‎05-13-2021 05:03 AM

Are there any drops on ports connected to printers?

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