Cisco 2960s fibre Issue

[wirelessadvisors]

Kit List

2* WS-C2960S-24PS-L

2* GLC- SX-MM  Fibre Modules

1 * 2m Multi-Mode Duplex Fibre Patch Cable,50/125 OM3, LC-LC, Aqua

1 * 4m Multi-Mode Duplex Fibre Patch Cable,50/125 OM3, LC-LC, Aqua

We have setup a fibre link between two offices under 100M Range

Configured the switchs as follows

Switch 1

Ports 1-22

Vlan 100

Vlan 1

Port 21 &23

Vlan 5

Port 24

Trunk

port 25 is for the fibre link

Switch 2

Ports 1-22

Vlan 100

Vlan 1

Port 23

Vlan 5

Port 24

Trunk

port 25 is for the fibre link

I can't get the fibre link to come up

I have tried locally plugging this into the switched into 2m Multi-Mode Duplex Fibre Patch Cable,50/125 OM3, LC-LC i get no activity at all

HELP

I have a cisco case open but i need these working by friday, what am i missing

fibre link is om2 patch panel from site to site cable should be backward compatible.

[stephenshaw]

Hi John,

one aspect that often gets over-looked .... did the fibre pairs get reversed on one side, such that RX goes to TX and vice versa? If so, please post the actual configuration and output for port 25.

[wirelessadvisors]

Switch 1

GigabitEthernet1/0/25 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is c062.6b02.2f19 (bia c062.6b02.2f19)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex, Auto-speed, link type is auto, media type is Not Present
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, 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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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

Switch 2

GigabitEthernet1/0/26 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is 40f4.ecab.5b1a (bia 40f4.ecab.5b1a)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex, Auto-speed, link type is force-up, media type is Not Present
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, 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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 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

GigabitEthernet1/0/25 is down, line protocol is down (notconnect)
  Hardware is Gigabit Ethernet, address is 40f4.ecab.5b19 (bia 40f4.ecab.5b19)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex, Auto-speed, link type is auto, media type is 1000BaseSX SFP
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, 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
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 0 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

[Sebastian Fernandez]

John,

there is also an IOS bug associated with 2960S platform, see below

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtk54457

Try setting speed to auto. If you find this post usefull. Please rate.

Rgds,

Sebastian

[wirelessadvisors]

I'm using  12.2(53)SE not covered in link below

bug associated with 2960S platform, see below

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtk54457

[Leo Laohoo]

Two things are possibly the culprit:

1.  The fibre presented could not have been crossed (rcv coming in the rcv end and send coming in the send end).  So you need to see if you can cross your LC-LC cable.

2.  The fibre could be broken somewhere.  An OTDR would be needed.

[wirelessadvisors]

the issue behind the Fibre link doesn’t come up, is a faulty SFP installed on one side of your switches…

Installing the SFP on the switch #1, we are able to see the interface coming up with no issues, but on the other side, there is  no indication or even LED on the SFP itself that shows the SFP is operational…

Furthermore, Swap the SFP around, between both installed switches, and we are able to confirm that the SFP is faulty as there is no LED light… now I can confirm that there is no issue with the switches and there is a faulty SFP that causing the experienced problem…

Getting replacement SFP today

[wirelessadvisors]

One SFP lights up the otherside stays down

if i swap the cable ends the other switch comes up

ahhhhhhhhhh

help

[Reza Sharifi]

Are you using patch panels or this is direct connection between the

2 switches?

[wirelessadvisors]

I have tried both

switch to switch lc -lc

and over the two buildings same result

getting new cables today

Thanks

John