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New Member

%SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm

Hi,

 

I am facing a strange problem in one of my Cisco Catalyst 4900M switch. We have a ten gig WAN link which went down (error-disabled) couple of weeks back with logs suggesting Low TX power.

Tried followingtroubleshooting approach, but it did not resolve the problem.

  1. SFP replaced
  2. Tried connecting the link on a different port.
  3. Fibers tested and found to be OK
  4. Performed loop test and was able to see the loop on both end of the P2P link.
  5. Replaced the Cables between PTT demarcation till switch patch panel.

 

Switch Logs:

IOS Version: bootflash:cat4500e-entservices-mz.150-2.SG1.bin

Model: Cisco Catalyst 4900M

 

 

*Jun 19 12:32:36.582: %PM-4-ERR_DISABLE: link-flap error detected on Te1/1, putting Te1/1 in err-disable state
*Jun 19 12:34:04.154: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 12:44:04.254: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 12:54:04.354: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:04:04.454: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:14:04.558: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:24:04.658: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:34:04.761: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:44:04.861: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 13:54:04.961: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:04:05.061: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:14:05.161: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:24:05.261: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:34:05.361: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:44:05.461: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 14:54:05.561: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
*Jun 19 15:04:05.661: %SFF8472-5-THRESHOLD_VIOLATION: Te1/1: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -12.2 dBm.
Switch1#
Switch1#
Switch1#
Switch1#sh int te1/1
TenGigabitEthernet1/1 is down, line protocol is down (err-disabled)
  Hardware is Ten Gigabit Ethernet Port, address is 2c54.2de6.5100 (bia 2c54.2de6.5100)
  Description: ***P2P ***
  MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 10Gb/s, link type is auto, media type is 10GBase-LR
  input flow-control is off, output flow-control is off
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 02:39:04, output never, output hang never
  Last clearing of "show interface" counters 2w0d
  Input queue: 0/2000/0/0 (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
     2367 packets input, 199072 bytes, 0 no buffer
     Received 2367 broadcasts (2367 multicasts)
     1 runts, 0 giants, 0 throttles
     5 input errors, 4 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     5951 packets output, 453948 bytes, 0 underruns
     0 output errors, 0 collisions, 13 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Switch1#

Switch1#sh int te1/1 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)
--------- ------------------  ----------  ---------  ---------  ---------
Te1/1       30.7                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)
---------  ---------------    ----------  ---------  ---------  ---------
Te1/1      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)
---------  -----------------  ----------  ---------  ---------  ---------
Te1/1      -40.0                 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)
-------    -----------------  ----------  ---------  ---------  ---------
Te1/1      -12.3                 4.4         0.4       -14.4      -18.4

 

  • LAN Switching and Routing
3 REPLIES
New Member

do you have other optical SFP

do you have other optical SFP there in ? please share both of transceiver details -

i.e.

"show int te1/1 transceiver detail"  and "show int te1/2 transceiver detail"

 

-

Parvesh

New Member

I did replace the SFP with a

I did replace the SFP with a new one.

Interface Te1/2 is up and working.

 

SESK_P2P10G-4900MSOD-SW1#sh int te1/2 transceiver de
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)
--------- ------------------  ----------  ---------  ---------  ---------
Te1/2       34.6                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)
---------  ---------------    ----------  ---------  ---------  ---------
Te1/2      3.22                   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)
---------  -----------------  ----------  ---------  ---------  ---------
Te1/2       -1.5                 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)
-------    -----------------  ----------  ---------  ---------  ---------
Te1/2       -3.6                 4.4         0.4       -14.4      -18.4

 

New Member

what is the solution for the

what is the solution for the same.....??? I have the problem too...  I am using Cisco 2960G switch.

 

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