03-22-2011 08:36 AM - edited 03-06-2019 04:12 PM
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.
03-22-2011 08:42 AM
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.
03-22-2011 10:14 AM
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
03-22-2011 10:46 AM
John,
there is also an IOS bug associated with 2960S platform, see below
Try setting speed to auto. If you find this post usefull. Please rate.
Rgds,
Sebastian
03-22-2011 10:53 PM
I'm using 12.2(53)SE not covered in link below
bug associated with 2960S platform, see below
03-23-2011 01:32 AM
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.
03-24-2011 02:43 AM
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
03-26-2011 11:50 AM
One SFP lights up the otherside stays down
if i swap the cable ends the other switch comes up
ahhhhhhhhhh
help
03-26-2011 12:02 PM
Are you using patch panels or this is direct connection between the
2 switches?
03-28-2011 01:02 AM
I have tried both
switch to switch lc -lc
and over the two buildings same result
getting new cables today
Thanks
John
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