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New Member

TenGigE Interface Sometime fault

Hi,

I am facing a problem where my TenGigE interface is sometime down.

Diagram:

ASR1K <----> ASR9K

Log on ASR1K :

.Jan 14 07:56:31 GMT+7: %IOSXE_SPA-6-UPDOWN: Interface TenGigabitEthernet0/2/0, link down due to remote fault

On ASR9K, i don't find any log.

By Shut/Commit and No Shut/Commit on ASR9K, the link resumed to normal.

Any idea?

PS: the fiber path cord is around 5m.

Regards,

CT

19 REPLIES
Hall of Fame Super Gold

TenGigE Interface Sometime fault

Post the output to the command "sh interface Ten 0/2/0".

New Member

TenGigE Interface Sometime fault

PE#sh int ten0/2/0

TenGigabitEthernet0/2/0 is up, line protocol is up

  Hardware is SPA-1X10GE-L-V2, address is 30f7.0d42.2c20 (bia 30f7.0d42.2c20)

  Description: CONNECT ME01-POP1 (T1/30) - TRUNK

  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,

     reliability 255/255, txload 255/255, rxload 1/255

  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set

  Keepalive not supported

  Full Duplex, 10000Mbps, link type is force-up, media type is 10GBase-LR

  output flow-control is on, input flow-control is on

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:05, output hang never

  Last clearing of "show interface" counters never

  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 18443

  Queueing strategy: fifo

  Output queue: 0/40 (size/max)

  5 minute input rate 29572000 bits/sec, 5833 packets/sec

  5 minute output rate 30406000 bits/sec, 4014 packets/sec

     8553385575 packets input, 5321708311292 bytes, 0 no buffer

     Received 241799997 broadcasts (0 IP multicasts)

     0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 996344186 multicast, 0 pause input

     6257933590 packets output, 5661214436454 bytes, 0 underruns

     0 output errors, 0 collisions, 5 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

Hall of Fame Super Gold

Re: TenGigE Interface Sometime fault

PS: the fiber path cord is around 5m.

Full Duplex, 10000Mbps, link type is force-up, media type is 10GBase-LR

Uhhhhh ... WHAT?????

Hall of Fame Super Gold

Re: TenGigE Interface Sometime fault

reliability 255/255, txload 255/255, rxload 1/255

Can you post the "sh interface" from the remote end?

New Member

TenGigE Interface Sometime fault

Here is the status on ASR9K:

RP/0/RSP0/CPU0:9K-01-SCT#sh int ten0/0/2/2

Tue Jan 14 11:11:51.864 GMTKH

TenGigE0/0/2/2 is up, line protocol is up

  Interface state transitions: 9

  Hardware is TenGigE, address is 10f3.110c.98de (bia 10f3.110c.98de)

  Layer 1 Transport Mode is LAN

  Description: CONNECT PE

  Layer 2 Transport Mode

  MTU 1514 bytes, BW 10000000 Kbit (Max: 10000000 Kbit)

     reliability 255/255, txload 0/255, rxload 0/255

  Encapsulation ARPA,

  Full-duplex, 10000Mb/s, link type is force-up

  output flow control is off, input flow control is off

  loopback not set,

  Last input 00:00:00, output 00:00:00

  Last clearing of "show interface" counters never

  5 minute input rate 26035000 bits/sec, 3524 packets/sec

  5 minute output rate 22788000 bits/sec, 5196 packets/sec

     6267071861 packets input, 5670584827328 bytes, 98098 total input drops

     0 drops for unrecognized upper-level protocol

     Received 736499 broadcast packets, 20857 multicast packets

              0 runts, 0 giants, 0 throttles, 0 parity

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     8566988780 packets output, 5330087075217 bytes, 735 total output drops

     Output 242283785 broadcast packets, 996960399 multicast packets

     0 output errors, 0 underruns, 0 applique, 0 resets

     0 output buffer failures, 0 output buffers swapped out

     9 carrier transitions

Hall of Fame Super Gold

TenGigE Interface Sometime fault

1. Can you confirm what is the length of the fibre optic patch cable? 

2.  On the switch, can you post the output to the command "sh interface Ten 0/2/0 transceiver prop"?

New Member

TenGigE Interface Sometime fault

1. Confirm the cable length is around 5m (or less then 10m)

2. Below is the output:

ME4900#sh int te1/30 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)

--------- ------------------  ----------  ---------  ---------  ---------

Te1/30      34.7                74.0        70.0         0.0       -4.0

                              High Alarm  High Warn  Low Warn   Low Alarm

           Voltage            Threshold   Threshold  Threshold  Threshold

Port       (Volts)            (Volts)     (Volts)    (Volts)    (Volts)

---------  ---------------    ----------  ---------  ---------  ---------

Te1/30     0.00                   N/A         N/A         N/A        N/A

           Optical            High Alarm  High Warn  Low Warn   Low Alarm

           Transmit Power     Threshold   Threshold  Threshold  Threshold

Port       (dBm)              (dBm)       (dBm)      (dBm)      (dBm)

---------  -----------------  ----------  ---------  ---------  ---------

Te1/30      -2.0                 4.4         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)

-------    -----------------  ----------  ---------  ---------  ---------

Te1/30     -11.7                 4.4         0.4       -14.4      -18.4

Hall of Fame Super Gold

TenGigE Interface Sometime fault

1. Confirm the cable length is around 5m (or less then 10m

Ok, then finally, can you post the output to the command "sh inventory".  I think I know where the problem is.

Hall of Fame Super Gold

Re: TenGigE Interface Sometime fault

PS: the fiber path cord is around 5m.

Full Duplex, 10000Mbps, link type is force-up, media type is 10GBase-LR

If what you are saying is correct, that the fibre optic patch cable is only 5 to 10 metres and the fibre optic used is LR (or LONG REACH), then what your Cisco appliance is behaving (ports go down) is normal.

This is because you are using LR fibre optic modules to shoot at a very short distance.  At 5 to 10 metres you should be using 10GBase-SR

New Member

TenGigE Interface Sometime fault

OK, thanks.

I will make it longer and also put attenuators.

Thanks so much for the input.

Hall of Fame Super Gold

TenGigE Interface Sometime fault

I will make it longer and also put attenuators.

I am not sure if attenuators are enough.  You need to replace the fibre optic modules (and cable) if the distance is too short.

New Member

TenGigE Interface Sometime fault

Some people say it maybe a bug. Is it possible?

Hall of Fame Super Gold

TenGigE Interface Sometime fault

Some people say it maybe a bug. Is it possible?

LOL!  No it is not a bug.

Someone is using LR fibre modules to shoot traffic down a 5 METRE DISTANCE.  That's not a bug.  That's @#$%^&*!!! stupidity. 

New Member

* Minimum cabling distance

* Minimum cabling distance for -SR, -LRM, -LR, -ER modules is 2m, according to the IEEE 802.3ae.

New Member

There is nothing stupid about

There is nothing stupid about this.

10GBase-LR should work fine over a short distance - attenuators may be needed on the recieve side to protect the optics but that's it.

Suggesting that everyone run multi-mode unless they need long range might be a little short sighted.  Many shop's and telco's standardize on single mode so they do not need to carry two types of cable, optics etc.  The cost difference is relatively minor these days.

Your response is not very helpful to the user.

Hall of Fame Super Gold

10GBase-LR should work fine

10GBase-LR should work fine over a short distance - attenuators may be needed on the recieve side to protect the optics but that's it.

Did the OP mentioned that attenuators were ever used?  No he did not.  

Telcos "may" use LR in short distances (they can stock attenuators all over their network) but they are telcos.  They "may" know what they are doing with their optical modules.  

This OP doesn't work for a Telco.  Trying to encourage people not to follow good practices and/or standard because "hey, if the telcos can do it, why can't I" ain't really helpful either.  

The cost difference is relatively minor these days.

To be honest, I disagree.  

Some people here don't have deep pockets.  A lot of people (and their employers) find it difficult to justify going down the Cisco road as opposed to HP or Juniper.  

Hall of Fame Super Gold

TenGigE Interface Sometime fault

It's not just technically stup1d but also financially.

Do you know how much a 10 Gbps LR module costs?

Typically, a 10 Gbps LR modules is DOUBLE the cost of a 10 Gbps SR module. 

VIP Super Bronze

TenGigE Interface Sometime fault

Also, one thing I suggest you do is to clean the fiber tips with alcohol.  You may have dirty fiber strands on one side.

HTH

It's a bug as shown here :

It's a bug as shown here : https://tools.cisco.com/bugsearch/bug/CSCun88935/?referring_site=bugquickviewclick

 

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