cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
216
Views
0
Helpful
10
Replies

Cisco 2960S and Cisco 4912 (CatOS) FCS errors

ispukrsat
Beginner
Beginner

The switches are connected by an optical patch cord. When transmitting data, errors increase on port 4912. Setting the speed and duplex on auto-negotiation or without auto-negotiation - the result is the same. The same cisco 2960S in conjunction with other models (3560G, 3750G - IOS) works correctly without errors. The problem is in CatOS?

QIP Shot - Screen 008.png

These are the ports in 4912. Тhere are errors - cisco 2960, no errors - 3560

10 Replies 10

Reza Sharifi
Hall of Fame Expert Hall of Fame Expert
Hall of Fame Expert

Cat OS is at least 20 years old. You may want to upgrade to a newer version of IOS.

HTH

MHM Cisco World
Advisor
Advisor

if the error in one port then we can think that this issue of cable or NIC but 
four port same issue ?
can we see 
show interface for one port 

Yes, 2960 was recently turned on in these four ports, 3560 and 3548 were turned on in the remaining ports, they have been working for a long time, there have never been any errors.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

Post the complete output to the command "sh interface <PORT>".  I want to see the output from both switches.

ispukrsat
Beginner
Beginner

Сisco 4912

49124912

Cisco 2960 (port 2/10)

29602960

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

BX optics on one side and LH optics on another ... I hate to ask the next question:  What is the distance between the two optics?

ispukrsat
Beginner
Beginner

Distance "between two optics" 300 meters. If the same modules are included in 3560 instead of 2960, there are no errors.

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

@ispukrsat wrote:
Distance "between two optics" 300 meters.

Ok, that confirms the BX module has burnt out the optics of the LH.  

This is how cisco defines the modules, they are 3km on both sides. And why does the same "burnt" link work with the same 4912 on the one side and 3560 on the other side? 

sh interfaces transceiver on cisco 2960:

QIP Shot - Screen 011.png

on 4912 can't see levels

Leo Laohoo
VIP Community Legend VIP Community Legend
VIP Community Legend

It would be "ok" if both ends were LH optics.  Instead, with a distance of 300 metres, one is BX and another is LH. 

BX is too strong for that distance.  The LH optics is good as gone.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers