09-25-2015 12:34 AM - edited 03-08-2019 01:56 AM
Hi
I am trying to commission new 10Gbps LR link over SMF using two C3750x switches but the link doesn't come up. The end to end distance is less then 10km.
I have checked transceiver details and TX/RX dBm is normal range. Can someone please advise what else I should check?
Here is details of switch-A and switch-B.
Switch-A#sh int t5/1/1
TenGigabitEthernet5/1/1 is down, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet, address is 1cdf.0f4f.9ec1 (bia 1cdf.0f4f.9ec1)
Internet address is 10.10.10.1/30
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
Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-LR
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 IP 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-A#sh int t5/1/1 transceiver detail
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.
High Alarm High Warn Low Warn Low Alarm
Temperature Threshold Threshold Threshold Threshold
Port (Celsius) (Celsius) (Celsius) (Celsius) (Celsius)
--------- ------------------ ---------- --------- --------- ---------
Te5/1/1 23.5 75.0 70.0 0.0 -6.0
High Alarm High Warn Low Warn Low Alarm
Voltage Threshold Threshold Threshold Threshold
Port (Volts) (Volts) (Volts) (Volts) (Volts)
--------- --------------- ---------- --------- --------- ---------
Te5/1/1 3.34 3.70 3.60 3.00 2.90
Optical High Alarm High Warn Low Warn Low Alarm
Transmit Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
--------- ----------------- ---------- --------- --------- ---------
Te5/1/1 -2.8 3.5 0.4 -8.2 -12.2
Optical High Alarm High Warn Low Warn Low Alarm
Receive Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
------- ----------------- ---------- --------- --------- ---------
Te5/1/1 -12.6 3.5 0.4 -13.8 -14.1
Switch-B#
Switch-B#sh int t4/1/1
TenGigabitEthernet4/1/1 is down, line protocol is down (notconnect)
Hardware is Ten Gigabit Ethernet, address is 1cdf.0f4f.98c1 (bia 1cdf.0f4f.98c1)
Internet address is 10.10.10.2/30
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
Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-LR
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 IP 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-B#sh int t4/1/1 transceiver detail
ITU Channel not available (Wavelength not available),
Transceiver is internally calibrated.
mA: milliamperes, dBm: decibels (milliwatts), NA or N/A: not applicable.
++ : high alarm, + : high warning, - : low warning, -- : low alarm.
A2D readouts (if they differ), are reported in parentheses.
The threshold values are calibrated.
High Alarm High Warn Low Warn Low Alarm
Temperature Threshold Threshold Threshold Threshold
Port (Celsius) (Celsius) (Celsius) (Celsius) (Celsius)
--------- ------------------ ---------- --------- --------- ---------
Te4/1/1 25.9 75.0 70.0 0.0 -6.0
High Alarm High Warn Low Warn Low Alarm
Voltage Threshold Threshold Threshold Threshold
Port (Volts) (Volts) (Volts) (Volts) (Volts)
--------- --------------- ---------- --------- --------- ---------
Te4/1/1 3.34 3.70 3.60 3.00 2.90
Optical High Alarm High Warn Low Warn Low Alarm
Transmit Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
--------- ----------------- ---------- --------- --------- ---------
Te4/1/1 -3.6 3.5 0.4 -8.2 -12.2
Optical High Alarm High Warn Low Warn Low Alarm
Receive Power Threshold Threshold Threshold Threshold
Port (dBm) (dBm) (dBm) (dBm) (dBm)
------- ----------------- ---------- --------- --------- ---------
Te4/1/1 -10.2 3.5 0.4 -13.8 -14.1
09-25-2015 01:00 AM
Hi,
- try to switch fiber optic Rx with TX;
- on both interfaces cmd : switchport nonegociate
09-27-2015 07:59 PM
Hi Dan,
I've already tried your both suggestions but didn't make any difference.
09-25-2015 01:08 AM
Hi Alex,
Here are some things I think might help (some of them are pretty long shots, but you never know...):
- "show version" (maybe it's an IOS bug)
- "show inventory" (for part numbers of the transceivers and the modules they're plugged into)
- what happens if you configure "speed nonegotiate" on both ends?
- are there any multimode fiber patches on the way?
- are you sure that's dark fiber between the switches? it almost looks like each is connected to something other than 10GbE...
09-27-2015 08:19 PM
Hi Lulian,
- I don't have "show version" information but I don't think this is related to IOS bug as I did same test using other Nexus switches.
- I don't have "show inventory" information but here is information when I tested with Nexus7K.
Nexus7K#sh int e3/17 transceiver details
Ethernet3/17
transceiver is present
type is 10Gbase-LR
name is CISCO-FINISAR
part number is FTLX1474D3BCL-CS
revision is A
serial number is FNS16150CE0
nominal bitrate is 10300 MBit/sec
Link length supported for 9/125um fiber is 10 km
- I haven't tried "speed nonegotiate" But I hard set speed at both end to 10000 FULL. Will try it at next stage.
- I don't think there are MMF patches but I think it is worth double check.
- I confirm that's dark fiber.
I'm going to ask our fiber team to run end to end OTDR test to see SMF details.
Thanks
Alex
09-28-2015 01:24 AM
One quick test then: if you take a short patch and "loop" any of the problematic transceivers, does the link come up?
09-25-2015 01:28 AM
Hi,
What is the power value at Mux A end and Mux B end , Are they getting appropriate signal strength.
-GI
09-27-2015 08:30 PM
Hi Ganeshh
I'm going to ask someone to run end-to-end OTDR test to check signal strength and so on.
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