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Output errors at interface L3 core switch

I am getting complaints from a customer that the internet is slow etc.

Checked the monitoring system and it seems that I found something that may cause this.

 

I see lots of of output errors showing up in the interfaces.

 

The configuration can be seen below:

 

VIA SH INT GIG3/0/2

 

GigabitEthernet3/0/2 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
reliability 229/255, txload 55/255, rxload 18/255
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 00:00:00, output never, output hang never
Last clearing of "show interface" counters 18w6d
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2615721751
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 7387000 bits/sec, 1965 packets/sec
5 minute output rate 21826000 bits/sec, 4914 packets/sec
13965030314 packets input, 8734357025223 bytes, 0 no buffer
Received 968212600 broadcasts (957110791 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 957110791 multicast, 0 pause input
0 input packets with dribble condition detected
29673603754 packets output, 16817390926738 bytes, 0 underruns
2615721751 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

 

VIA SH CONTROLLERS

Transmit GigabitEthernet3/0/2 Receive
49679481880553 Total bytes 26133110389427 Total bytes
89200860386 Unicast frames 38605909005 Unicast frames
46811227373379 Unicast bytes 25887934346747 Unicast bytes
4481328308 Multicast frames 2433333273 Multicast frames
2818603010858 Multicast bytes 241936545383 Multicast bytes
633997954 Broadcast frames 35191185 Broadcast frames
49651495912 Broadcast bytes 3239497223 Broadcast bytes
0 System FCS error frames 0 IpgViolation frames
0 MacUnderrun frames 0 MacOverrun frames
0 Pause frames 0 Pause frames
0 Cos 0 Pause frames 0 Cos 0 Pause frames
0 Cos 1 Pause frames 0 Cos 1 Pause frames
0 Cos 2 Pause frames 0 Cos 2 Pause frames
0 Cos 3 Pause frames 0 Cos 3 Pause frames
0 Cos 4 Pause frames 0 Cos 4 Pause frames
0 Cos 5 Pause frames 0 Cos 5 Pause frames
0 Cos 6 Pause frames 0 Cos 6 Pause frames
0 Cos 7 Pause frames 0 Cos 7 Pause frames
0 Oam frames 0 OamProcessed frames
0 Oam frames 0 OamDropped frames
36341799 Minimum size frames 22590562 Minimum size frames
12771577419 65 to 127 byte frames 19727945359 65 to 127 byte frames
3225899070 128 to 255 byte frames 3165608065 128 to 255 byte frames
59719052739 256 to 511 byte frames 2076054393 256 to 511 byte frames
1086929841 512 to 1023 byte frames 664092194 512 to 1023 byte frames
8792790701 1024 to 1518 byte frames 15096640191 1024 to 1518 byte frames
8683595080 1519 to 2047 byte frames 321502699 1519 to 2047 byte frames
0 2048 to 4095 byte frames 0 2048 to 4095 byte frames
0 4096 to 8191 byte frames 0 4096 to 8191 byte frames
0 8192 to 16383 byte frames 0 8192 to 16383 byte frames
0 16384 to 32767 byte frame 0 16384 to 32767 byte frame
0 > 32768 byte frames 0 > 32768 byte frames
0 Late collision frames 0 SymbolErr frames
14569127810 Excess Defer frames 0 Collision fragments
0 Good (1 coll) frames 0 ValidUnderSize frames
0 Good (>1 coll) frames 0 InvalidOverSize frames
0 Deferred frames 0 ValidOverSize frames
0 Gold frames dropped 0 FcsErr frames
0 Gold frames truncated
0 Gold frames successful
0 1 collision frames
0 2 collision frames
0 3 collision frames
0 4 collision frames
0 5 collision frames
0 6 collision frames
0 7 collision frames
0 8 collision frames
0 9 collision frames
0 10 collision frames
0 11 collision frames
0 12 collision frames
0 13 collision frames
0 14 collision frames
0 15 collision frames
0 Excess collision frames  

 

Clear counters interface gi3/0/2:

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 10699920
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 7041000 bits/sec, 1855 packets/sec
5 minute output rate 23146000 bits/sec, 5145 packets/sec
4529571 packets input, 2538823351 bytes, 0 no buffer
Received 161558 broadcasts (157095 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 157095 multicast, 0 pause input
0 input packets with dribble condition detected
9936990 packets output, 5737372788 bytes, 0 underruns
10699920 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

 

Extra information:

Device: Cisco Switch 3850

Version: 03.06.06E

 

I am not using QoS.

 

What can cause this? Is it because of the reliability value?

 

Many thanks in advance.

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Re: Output errors at interface L3 core switch


@Mertino11 wrote:

reliability 229/255


Reliability should ALWAYS be 255/255.

This is showing me that there is a layer 1 issue.  I'd check out that cable. 

Look at the value of the Total Output Drops and Output Drops.  The values are EXACTLY the same.  This is a known bug in the 3.6.X and 3.7.X firmware.

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