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.
- SFP replaced
- Tried connecting the link on a different port.
- Fibers tested and found to be OK
- Performed loop test and was able to see the loop on both end of the P2P link.
- 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
