SFP related log. What's mean?

[SeokGeunChoi73564]

Hi All, 

I have a problem with SFP module.

SFP module spec is 1G MM FC, Cisco bulk.

It worked last few month (I think about 2month at least).

But few days ago, C9300L device's SFP port has been down and state UP, suspended in few seconds.

So I moved fiber cable to SFP port 2(Gi 1/1/1 -> Gi 1/1/2), then switch connected.

logs

[[[[[

*Jul 27 06:48:51.611 KST: %SMART_LIC-3-COMM_FAILED: Communications failure with the Cisco Smart License Utility (CSLU) : Unable to resolve server hostname/domain name
*Jul 27 14:48:51.610 KST: %SMART_LIC-3-COMM_FAILED: Communications failure with the Cisco Smart License Utility (CSLU) : Unable to resolve server hostname/domain name
*Jul 27 18:27:24.286 KST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1/1, changed state to down
*Jul 27 18:27:24.287 KST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to down
*Jul 27 18:27:25.293 KST: %LINK-3-UPDOWN: Interface Port-channel1, changed state to down

...

*Jul 27 18:27:31.596 KST: %ETC-5-L3DONTBNDL2: Gi1/1/1 suspended: LACP currently not enabled on the remote port.
*Jul 27 21:53:37.016 KST: %SFF8472-3-THRESHOLD_VIOLATION: Gi1/1/1: Tx power low alarm; Operating value: -37.0 dBm, Threshold value: -11.7 dBm.

...

*Jul 28 15:03:00.933 KST: %LINK-3-UPDOWN: Interface GigabitEthernet1/1/1, changed state to down
*Jul 28 15:03:12.854 KST: %LINK-3-UPDOWN: Interface GigabitEthernet1/1/2, changed state to up
*Jul 28 15:03:19.058 KST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1/2, changed state to up
*Jul 28 15:03:20.051 KST: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
*Jul 28 15:03:21.051 KST: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up

]]]]]

Gi 1/1/1 and Gi 1/1/2 have same configuration, grouping with Port-channel 1 active mode.

what is mean " %SFF8472-3-THRESHOLD_VIOLATION: Gi1/1/1: Tx power low alarm; Operating value: -37.0 dBm, Threshold value: -11.7 dBm. " ?

why suddenly it happened and Gi 1/1/1 suspended ? (Clearly worked same port, there is no changed with physically or logically.) 

[[ Transceiver status for now ]] (* is it looks fine? )

                  Temperature      Voltage  Current         Tx Power Rx Power
Port              (Celsius)         (Volts)       (mA)               (dBm) (dBm)
                     --------- ----------- -------      -------- -------- 
Gi1/1/1              34.6            3.31           0.0              -40.0      -40.0
Gi1/1/2              33.1            3.30           7.9               -4.2         -5.0

Thanks.

[Flavio Miranda]

@SeokGeunChoi73564 

 The reason is on the logs:

"suspended: LACP currently not enabled on the remote port."

You need to check the port channel config on the other device.

[SeokGeunChoi73564]

Hi Flavio Miranda 

Other device is good. I already checked LACP configuration.

Thanks.

[Flavio Miranda]

Can you share the config for port-channel in both devices just to double check?

[SeokGeunChoi73564]

Hi.

Here's configuration. Po3 is on distributed switch

Po3(SU) LACP Twe1/0/3(P) Twe2/0/3(D)

interface TwentyFiveGigE1/0/3
description =B3=
switchport mode trunk
channel-group 3 mode active
spanning-tree portfast
end

Po1 is on access switch

Po1(SU) LACP Gi1/1/1(D) Gi1/1/2(P) Gi1/1/3(D) Gi1/1/4(D)

!
interface GigabitEthernet1/1/1
description =Uplink=
switchport mode trunk
channel-group 1 mode active
end

Ark_F_2F-B-E3#sh ru int gi 1/1/2
Building configuration...

Current configuration : 112 bytes
!
interface GigabitEthernet1/1/2
description =Uplink=
switchport mode trunk
channel-group 1 mode active
end

Thanks

[Leo Laohoo]

---

@SeokGeunChoi73564 wrote:
*Jul 27 21:53:37.016 KST: %SFF8472-3-THRESHOLD_VIOLATION: Gi1/1/1: Tx power low alarm; Operating value: -37.0 dBm, Threshold value: -11.7 dBm.

---

Replace the optics and replace the fibre patch cord.  

If the problem persist, get an OTDR conducted.

[M02@rt37]

Hello @SeokGeunChoi73564,

There might be an issue with the SFP module in Gig1/1/1. The log message: "%SFF8472-3-THRESHOLD_VIOLATION: Gi1/1/1: Tx power low alarm; Operating value: -37.0 dBm, Threshold value: -11.7 dBm" indicates that the transmitter power 'TX' of the SFP module in GiG1/1/1 is significantly below the threshold value.

The SFP module is reporting a Tx power of -40.0 dBm, which is much lower than the threshold value of -11.7 dBm. This indicates that the SFP module is not transmitting at the expected power level and is potentially malfunctioning or experiencing signal issues.

As a result of this low Tx power, the interface Gi1/1/1 is going down, and the link is suspended. The log messages also indicate that the link protocol on Port-channel1 is going down since it includes Gi1/1/1.

--The fact that Gi1/1/2 is showing a Tx power of -4.2 dBm, which is within a reasonable range, suggests that the issue is specific to the SFP module in Gi1/1/1.

[Arif Amran]

you might need to detail check your medium; cable, SFP. Following link might be useful

https://www.dell.com/support/kbdoc/en-sg/000028053/how-to-interpret-sfp-transceiver-tx-and-rx-power-levels-as-part-of-troubleshooting-the-sfp-transceiver

https://www.cisco.com/c/en/us/products/collateral/storage-networking/mds-9000-series-multilayer-switches/product_data_sheet09186a00801bc698.html