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OutDiscards count continues to increase

JustTakeTheFirstStep
Level 4
Level 4

‎11-13-2019 10:37 PM

PortAlign-ErrFCS-ErrXmit-ErrRcv-ErrUnderSizeOutDiscards
Gi1/0/1000000
Gi1/0/2000000
Gi1/0/3000000
Gi1/0/4000000
Gi1/0/5000000
Gi1/0/6000000
Gi1/0/7000000
Gi1/0/8000000
Gi1/0/9000000
Gi1/0/10000000
Gi1/0/11000000
Gi1/0/12000000
Gi1/0/13000000
Gi1/0/14000000
Gi1/0/15000000
Gi1/0/16000000
Gi1/0/17000000
Gi1/0/18000000
Gi1/0/19000000
Gi1/0/20000000
Gi1/0/21000000
Gi1/0/22000000
Gi1/0/23000000
Gi1/0/24000000
Gi1/0/25000000
Gi1/0/26000000
Gi1/0/27000000
Gi1/0/28000000
Gi1/0/29000000
Gi1/0/30000000
Gi1/0/31000000
Gi1/0/32000000
Gi1/0/33000000
Gi1/0/34000000
Gi1/0/35000000
Gi1/0/36000000
Gi1/0/37000000
Gi1/0/38000000
Gi1/0/39000002173
Gi1/0/40000000
Gi1/0/41000000
Gi1/0/42000000
Gi1/0/43000000
Gi1/0/44000000
Gi1/0/45000000
Gi1/0/46000000
Gi1/0/47000000
Gi1/0/48000000
Gi1/0/49000000
Gi1/0/50000000
Gi1/0/51000000
Gi1/0/52000000

 

 

Incheon_1A-2_OA_SW_2#sh run int g1/0/39
interface GigabitEthernet1/0/39
description CCTV_IPwall_Controller
end

 

 

Incheon_1A-2_OA_SW_2#sh int g1/0/39
GigabitEthernet1/0/39 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is c064.e4ef.83a7 (bia c064.e4ef.83a7)
Description: CCTV_IPwall_Controller
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 6/255, 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 never, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:38:49
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 2584
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 119000 bits/sec, 230 packets/sec
5 minute output rate 25133000 bits/sec, 2121 packets/sec
588817 packets input, 38332011 bytes, 0 no buffer
Received 130 broadcasts (6 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 6 multicast, 0 pause input
0 input packets with dribble condition detected
5674583 packets output, 8374555701 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

 

 

OutDiscards count continues to increase.
Is there a possibility of an issue occurring on the network?

2 people had this problem
0 Helpful
17 Replies 17

Leo Laohoo
Hall of Fame
Hall of Fame

‎11-13-2019 10:50 PM

Post the complete output to the following commands:
1. sh interface Gi1/0/39 flow
2. sh controll e Gi1/0/39
0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Leo Laohoo

‎11-13-2019 11:03 PM - edited ‎11-13-2019 11:03 PM

Incheon_1A-2_OA_SW_2#sh interface Gi1/0/39 flow

PortSend FlowControlReceiveFlowControlRxPauseTxPause
 adminoperadminoper  
-------------------------------------------------------
Gi1/0/39Unsupp.Unsupp.offoff00

 

Incheon_1A-2_OA_SW_2#sh controll e Gi1/0/39

Transmit GigabitEthernet1/0/39 Receive
693835272 Bytes 172734319 Bytes
3605931774 Unicast frames 397191257 Unicast frames
7088565 Multicast frames 39909 Multicast frames
8549401 Broadcast frames 143794 Broadcast frames
0 Too old frames 151381109 Unicast bytes
0 Deferred frames 9330743 Multicast bytes
0 MTU exceeded frames 12022467 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 385710486 Minimum size frames
0 8 collision frames 8797954 65 to 127 byte frames
0 9 collision frames 2830508 128 to 255 byte frames
0 10 collision frames 14161 256 to 511 byte frames
0 11 collision frames 11962 512 to 1023 byte frames
0 12 collision frames 9889 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
50651211 64 byte frames 0 Valid frames, too small
15667504 127 byte frames
15013387 255 byte frames 0 Too old frames
24744380 511 byte frames 0 Valid oversize frames
108341649 1023 byte frames 0 System FCS error frames
3407151609 1518 byte frames 0 RxPortFifoFull drop frame
0 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 JustTakeTheFirstStep

‎11-14-2019 04:47 AM

That is odd.
The values don't add up.
What is the exact IOS version the switch stack is running on?
0 Helpful

Utami1151
Level 1
Level 1
In response to Leo Laohoo

‎01-20-2020 09:53 PM

Hi Leo,

 

I am very interested to understand more on how to troubleshoot interface errors on catalyst switches.

Would you mind sharing some references? 

 

Thanks in advanced

Utami

0 Helpful

Joseph W. Doherty
Hall of Fame
Hall of Fame

‎11-14-2019 10:55 AM

A lot of Cisco's "small" edge switch will drop frames due to limited buffer resources if there's transient congestion. Sometimes, "tuning" resources can mitigate the issue.

As Leo asks, what's the platform and IOS version?
0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Joseph W. Doherty

‎11-14-2019 08:51 PM

WS-C2960X-48FPS-L
Version 15.2(4)E8
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to JustTakeTheFirstStep

‎11-14-2019 10:27 PM

Counters don't match.
I suspect this is a bug.
0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Leo Laohoo

‎11-15-2019 01:13 AM

Isn't it because it keeps increasing?
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to JustTakeTheFirstStep

‎11-15-2019 04:40 AM

No.
Total Output Drops counters are actually Deferred Frames. Look at the output of the "sh controll e <PORT>" command. Deferred Frames is "0".
That's why I'm saying that this is odd and I suspect this could be an IOS bug.
What happens if you upgrade to, say, 15.2(4)E9?
0 Helpful

JungHwan Moon
Level 1
Level 1
In response to Leo Laohoo

‎11-27-2019 10:34 PM - edited ‎11-28-2019 12:23 AM

delete

0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Leo Laohoo

‎11-28-2019 12:25 AM

Thank you for helping me.
After a few days, I checked again and found that the outDiscards count for multiple interfaces increased.
Similarly, the Deferred frames count is 0.
If this is a bug, can you find a bug ID?
Version upgrade is not possible.
0 Helpful

Leo Laohoo
Hall of Fame
Hall of Fame
In response to JustTakeTheFirstStep

‎11-30-2019 11:44 PM

Post the complete output to the command "sh interface <PORT>".
0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Leo Laohoo

‎12-01-2019 04:41 PM

PortAlign-ErrFCS-ErrXmit-ErrRcv-ErrUnderSizeOutDiscards 
Gi1/0/10 0 0 0 0 0 
Gi1/0/20 0 0 0 0 0 
Gi1/0/30 0 0 0 0 1551 
Gi1/0/40 0 0 0 0 5 
Gi1/0/50 0 0 0 0 469 
Gi1/0/60 0 0 0 0 1271 
Gi1/0/70 0 0 0 0 1607 
Gi1/0/80 0 0 0 0 0 
Gi1/0/90 0 0 0 0 0 
Gi1/0/100 0 0 0 0 0 
Gi1/0/110 0 0 0 0 0 
Gi1/0/120 0 0 0 0 0 
Gi1/0/130 0 0 0 0 0 
Gi1/0/140 0 0 0 0 0 
Gi1/0/150 0 0 0 0 1533 
Gi1/0/160 0 0 0 0 0 
Gi1/0/170 0 0 0 0 28876 
Gi1/0/180 0 0 0 0 0 
Gi1/0/190 0 0 0 0 1533 
Gi1/0/200 0 0 0 0 0 
Gi1/0/210 0 0 0 0 0 
Gi1/0/220 0 0 0 0 0 
Gi1/0/230 0 0 0 0 262 
Gi1/0/240 0 0 0 0 0 
Gi1/0/250 0 0 0 0 0 
Gi1/0/260 0 0 0 0 0 
Gi1/0/270 0 0 0 0 0 
Gi1/0/280 0 0 0 0 0 
Gi1/0/290 0 0 0 0 0 
Gi1/0/300 0 0 0 0 0 
Gi1/0/310 0 0 0 0 0 
Gi1/0/320 0 0 0 0 0 
Gi1/0/330 0 0 0 0 0 
Gi1/0/340 0 0 0 0 0 
Gi1/0/350 0 0 0 0 0 
Gi1/0/360 0 0 0 0 0 
Gi1/0/370 0 0 0 0 0 
Gi1/0/380 0 0 0 0 159 
             
PortAlign-ErrFCS-ErrXmit-ErrRcv-ErrUnderSizeOutDiscards 
Gi1/0/390 0 0 0 01064253 
Gi1/0/400 0 0 0 0 0 
Gi1/0/410 0 0 0 0 226 
Gi1/0/420 0 0 0 0 0 
Gi1/0/430 0 0 0 0 0 
Gi1/0/440 0 0 0 0 0 
Gi1/0/450 0 0 0 0 0 
Gi1/0/460 0 0 0 0 0 
Gi1/0/470 0 0 0 0 0 
Gi1/0/480 0 0 0 0 0 
Gi1/0/490 0 0 0 0 390 
Gi1/0/500 0 0 0 0 0 
Gi1/0/510 0 0 0 0 0 
Gi1/0/520 0 0 0 0 0 
             
PortSingle-ColMulti-Col Late-ColExcess-ColCarri-Sen RuntsGiants
Gi1/0/100 0 0 0 0 0
Gi1/0/200 0 0 0 0 0
Gi1/0/300 0 0 0 0 0
Gi1/0/400 0 0 0 0 0
Gi1/0/500 0 0 0 0 0
Gi1/0/600 0 0 0 0 0
Gi1/0/700 0 0 0 0 0
Gi1/0/800 0 0 0 0 0
Gi1/0/900 0 0 0 0 0
Gi1/0/1000 0 0 0 0 0
Gi1/0/1100 0 0 0 0 0
Gi1/0/1200 0 0 0 0 0
Gi1/0/1300 0 0 0 0 0
Gi1/0/1400 0 0 0 0 0
Gi1/0/1500 0 0 0 0 0
Gi1/0/1600 0 0 0 0 0
Gi1/0/1700 0 0 0 0 0
Gi1/0/1800 0 0 0 0 0
Gi1/0/1900 0 0 0 0 0
Gi1/0/2000 0 0 0 0 0
Gi1/0/2100 0 0 0 0 0
Gi1/0/2200 0 0 0 0 0
Gi1/0/2300 0 0 0 0 0
Gi1/0/2400 0 0 0 0 0
             
PortSingle-ColMulti-Col Late-ColExcess-ColCarri-Sen RuntsGiants
Gi1/0/2500 0 0 0 0 0
Gi1/0/2600 0 0 0 0 0
Gi1/0/2700 0 0 0 0 0
Gi1/0/2800 0 0 0 0 0
Gi1/0/2900 0 0 0 0 0
Gi1/0/3000 0 0 0 0 0
Gi1/0/3100 0 0 0 0 0
Gi1/0/3200 0 0 0 0 0
Gi1/0/3300 0 0 0 0 0
Gi1/0/3400 0 0 0 0 0
Gi1/0/3500 0 0 0 0 0
Gi1/0/3600 0 0 0 0 0
Gi1/0/3700 0 0 0 0 0
Gi1/0/3800 0 0 0 0 0
Gi1/0/3900 0 0 0 0 0
Gi1/0/4000 0 0 0 0 0
Gi1/0/4100 0 0 0 0 0
Gi1/0/4200 0 0 0 0 0
Gi1/0/4300 0 0 0 0 0
Gi1/0/4400 0 0 0 0 0
Gi1/0/4500 0 0 0 0 0
Gi1/0/4600 0 0 0 0 0
Gi1/0/4700 0 0 0 0 0
Gi1/0/4800 0 0 0 0 0
Gi1/0/4900 0 0 0 0 0
Gi1/0/5000 0 0 0 0 0
Gi1/0/5100 0 0 0 0 0
Gi1/0/5200 0 0 0 0 0

 

 

Incheon_1A-2_OA_SW_2#sh controllers e g1/0/3

Transmit GigabitEthernet1/0/3 Receive
3460092293 Bytes 103751946 Bytes
83220920 Unicast frames 997444 Unicast frames
18337061 Multicast frames 100865 Multicast frames
16589597 Broadcast frames 12938 Broadcast frames
0 Too old frames 94096594 Unicast bytes
0 Deferred frames 6470598 Multicast bytes
0 MTU exceeded frames 3184754 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 776469 Minimum size frames
0 8 collision frames 128657 65 to 127 byte frames
0 9 collision frames 195783 128 to 255 byte frames
0 10 collision frames 1627 256 to 511 byte frames
0 11 collision frames 983 512 to 1023 byte frames
0 12 collision frames 7728 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
92822390 64 byte frames 0 Valid frames, too small
17597054 127 byte frames
3834598 255 byte frames 0 Too old frames
1337080 511 byte frames 0 Valid oversize frames
432192 1023 byte frames 0 System FCS error frames
2124237 1518 byte frames 0 RxPortFifoFull drop frame
27 Too large frames
0 Good (1 coll) frames
0 Good (>1 coll) frames

0 Helpful

JustTakeTheFirstStep
Level 4
Level 4
In response to Leo Laohoo

‎12-01-2019 04:42 PM

What is "Total Output Drops Counters" talking about?
0 Helpful
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