High input error rate

[singh7881]

I have a Cisco 2960S which connects to a core 4500X switch. When I first inserted fiber cables the 2960 was having a link flap issue. That was resolved by using a different sfp module. However there is now a high input error rate. Not just in the 2960, but the port in the core switch is also having a high rate of input error. 

This is from the 2960S

MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,
reliability 254/255, 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-SR
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:36:11, output 00:35:45, 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 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
7801430 packets input, 5222653261 bytes, 0 no buffer
Received 1749405 broadcasts (874976 multicasts)
0 runts, 297 giants, 0 throttles
220148 input errors, 214423 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 874976 multicast, 0 pause input
0 input packets with dribble condition detected
3089731 packets output, 1024057694 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 pause output
0 output buffer failures, 0 output buffers swapped out

Can anyone help me out?

[Ruben Cocheno]

@singh7881 

Replace the fiber and/or SFP between devices, assuming that you don't have any patch panel in between, otherwise ask to check the fiber between patch panels as well.

[singh7881]

Hi 

I do have a patch panel in between. I've already tried replacing the fiber and SFP which connects the switch to the patch panel, but it does not resolve the issue. On the 2960S I also have low Optical Receive Power, however this problem is not present on the core switch. 

[MHM Cisco World]

share 
show interface counter error 

MHM

[singh7881]

This is from the 2960S

This is from the 4500X

[MHM Cisco World]

errors in both SW is relate to SFP and/or fiper optic you use 
what is exact model of SFP you use ?
are it cisco or other vendor ?
MHM

[singh7881]

We are using 10GBASE-SR SFP modules. They are from cisco. 

[Leo Laohoo]

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@singh7881 wrote:

reliability 254/255

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Replace the optic on one side and observe.  If the line errors do not stop, put the Cisco optic back and replace the patch cord.  

[singh7881]

I have already tried replacing both multiple times, yet it does not stop the input errors

[MHM Cisco World]

for this SFP you can use 30 m fiper optic cable no more 
MHM 

[singh7881]

so that would include the length of the fiber backbone too right?

[MHM Cisco World]

if the length is more we see power optic low and 0 (N/A) and this what I see from show controller  

MHM

[singh7881]

But wouldn't I see low optical receive power in the core switch too? It should be a 2 way thing right, since both the core and the 2960 are sending and receiving data. 

This is from the core 4500X

[MHM Cisco World]

ok what is the length of cable you use ?
https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html
this datasheet of this SFP 
also there is matrix of compatibility it can that this SFP not compatible with  2960
https://tmgmatrix.cisco.com/

MHM

[singh7881]

I don't know the length of the backbone, but visually it seems well over 26m. To connect the switches to the patch panel itself a 3m cable is being used. That datasheet says with an OM3 cable up to 300m is supported, and we are using an OM3 cable. 

Result from the matrix of compatibility. This switch is supported.