Cisco SFP not connecting, shows signal, but with a fault

[Steve_Ballantyn]

Hello,

I have an Extreme X450-G2-48P-GE4 which I am linking to a Cisco 3750 series switch using two Cisco SFP 1000base SX modules (GLC-SX-MM). I am running ExtremeXOS version 16.1.2.14. I have no link lights, and no errors in my logs.

When I pull a debug on the port it shows signal is present, but that there is a "TX fault". I have tried increasing the debounce to 150 and then to 900, and rebooted the switch several times --- but still no connection.

Does anyone have any ideas on what I can try? I have two Extreme brand SFP's on the way, but I am trying to get this connection up in a hurry as users are anxious to get into new office space.
* X450G2-48p-G4.14 # debug hal show optic port 49
Port 49
SFP or SFP+: SFP
Signal: present
TX Fault: yes
SFP/SFP+ Vendor: CISCO-AVAGO
SFP/SFP+ Part Number: QFBR-5766LP
SFP/SFP+ Serial Number: AGS104255PX
SFP/SFP+ Manufacture Date: 061018
SFP/SFP+ Type: SFP/SFP+
Connector: LC
GE Compliance: 1000BASE-SX
Wavelength: 850
Also, I am *assuming* that the physical cable is good. But I had better be sure that it's not before I have the company come out to run a new line.

[Necheporenko__N]

According to AVAGO specification SFP module asserts TX_Fault with "1A" hex data at the byte 65. This could happens due to next reasons:

TX_FAULT
A laser fault or a low VCC condition will activate the transmitter fault signal, TX_FAULT, and disable the laser. A low signal indicates normal laser operation and a high signal indicates a fault.

Eye Safety Circuit
Under normal operating conditions, the laser power will be maintained below the eye-safety limit. If the eye safety limit is exceeded at any time, a laser fault will occur and the TX_FAULT output will be activated.

So there is no restriction to use this module from switch side.
Try to use another SFP as this module could be deffective.

[Steve_Ballantyn]

Here is the output from running the above command ...

X450G2-48p-G4.4 # debug hal show optic-info eeprom port 49
Port 49
SFP or SFP+: SFP
Signal: present
TX Fault: yes
SFP/SFP+ Vendor: CISCO-AVAGO
SFP/SFP+ Part Number: QFBR-5766LP
SFP/SFP+ Serial Number: AGS104255PX
SFP/SFP+ Manufacture Date: 061018
SFP/SFP+ Type: SFP/SFP+
Connector: LC
GE Compliance: 1000BASE-SX
Wavelength: 850

eeprom: Total Size 128, Values in Hex
00 01 02 03 04 05 06 07 08 09
-----------------------------------
000: 03 04 07 00 00 00 01 00 00 00
010: 00 01 0d 00 00 00 37 1b 00 00
020: 43 49 53 43 4f 2d 41 56 41 47
030: 4f 20 20 20 20 20 00 00 17 6a
040: 51 46 42 52 2d 35 37 36 36 4c
050: 50 20 20 20 20 20 20 20 20 20
060: 03 52 00 dd 00 1a 00 00 41 47
070: 53 31 30 34 32 35 35 50 58 20
080: 20 20 20 20 30 36 31 30 31 38
090: 20 20 00 00 00 de 00 00 06 e9
100: 3a 30 b9 bc 95 a3 20 f6 1a 07
110: bd 02 5a 44 7f 00 00 00 00 00
120: 00 00 00 00 21 30 5c 5a

[Steve_Ballantyn]

Thanks for the hint. I am off site at the moment, and it takes a while to get up to where this switch is location. I am going to take a Raspberry Pi up there and put it on wireless, connected locally to the console port on the switch so I can do some remote troubleshooting. I will test this as soon as I can get it set up!

[Stephane_Grosj1]

It should work. What kind of fiber do you use?

[Steve_Ballantyn]

Ooops, answered this above! Tripp Lite 25M Duplex Multimode Fiber 62.5/125 Patch Cable LC/LC 82ft.