https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13022#M426 You could also look at light levels on both sides on the link you are trying to get up if you are using a current switch with optics that support this... You need to also look at duplex settings if it is a sfp+ port.<BR /> <BR /> Command is <BR /> show port # transceiver info detail <BR /> <BR /> example <BR /> <BR /> PLW_X430_WWaterTP_Homestead.1 # sh02 port 25 transceiver info detail<BR /> <BR /> Port : 25<BR /> <BR /> Media Type : ZX_1550 (Industrial Temperature)<BR /> Vendor Name : SOURCEPHOTONICS<BR /> Part Number : SPGBZXIDFBEX<BR /> Serial Number : F2R2017123<BR /> Wavelength : 1550 nm<BR /> <BR /> Temp (Celsius) : 42.53 Status : Normal<BR /> Low Warn Threshold : -40.00 High Warn Threshold : 100.00<BR /> Low Alarm Threshold : -45.00 High Alarm Threshold : 105.00<BR /> <BR /> Voltage AUX-1/Vcc (Volts) : 3.27 Status : Normal<BR /> Low Warn Threshold : 3.00 High Warn Threshold : 3.60<BR /> Low Alarm Threshold : 2.90 High Alarm Threshold : 3.70<BR /> <BR /> Tx Power (dBm) : 2.23 Status : Normal<BR /> Low Warn Threshold : 0.00 High Warn Threshold : 5.00<BR /> Low Alarm Threshold : -1.00 High Alarm Threshold : 6.00<BR /> <BR /> Rx Power (dBm) : -8.36 Status : Normal<BR /> Low Warn Threshold : -23.01 High Warn Threshold : -3.00<BR /> Low Alarm Threshold : -23.98 High Alarm Threshold : -2.00<BR /> <BR /> Tx Bias Current (mA): 10.53 Status : Normal<BR /> Low Warn Threshold : 0.20 High Warn Threshold : 60.00<BR /> Low Alarm Threshold : 0.10 High Alarm Threshold : 70.00<BR /> <BR /> Tue, 07 Nov 2017 02:57:00 GMT EtherMAN 2017-11-07T02:57:00Z https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13018#M422 Hi...<BR /> i have problem with extreme switch how to troubleshoot if fiber optic is not working<BR /> Mon, 06 Nov 2017 13:23:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13018#M422 George 2017-11-06T13:23:00Z https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13019#M423 Hi,<BR /> is it an EXOS or EOS (Enterasys) switch?<BR /> <BR /> Mon, 06 Nov 2017 13:27:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13019#M423 ar1 2017-11-06T13:27:00Z https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13020#M424 exos<I></I> Mon, 06 Nov 2017 15:00:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13020#M424 George 2017-11-06T15:00:00Z https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13021#M425 Hello George,<BR /> Are you looking for UDLD (Unidirectional Link Fault Management)? UDLD can help to detect unidirectional links due to one-way traffic on fiber-optic or misconnected ports on fiber-optic links.<BR /> <BR /> <A href="http://documentation.extremenetworks.com/exos_22.3/exos_21_1/oam/c_unidirectional-link-fault-management.shtml" target="_blank" rel="nofollow noreferrer noopener">http://documentation.extremenetworks.com/exos_22.3/exos_21_1/oam/c_unidirectional-link-fault-managem...</A><BR /> <BR /> Best regards,<BR /> Bin Mon, 06 Nov 2017 15:12:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13021#M425 Bin 2017-11-06T15:12:00Z https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13022#M426 You could also look at light levels on both sides on the link you are trying to get up if you are using a current switch with optics that support this... You need to also look at duplex settings if it is a sfp+ port.<BR /> <BR /> Command is <BR /> show port # transceiver info detail <BR /> <BR /> example <BR /> <BR /> PLW_X430_WWaterTP_Homestead.1 # sh02 port 25 transceiver info detail<BR /> <BR /> Port : 25<BR /> <BR /> Media Type : ZX_1550 (Industrial Temperature)<BR /> Vendor Name : SOURCEPHOTONICS<BR /> Part Number : SPGBZXIDFBEX<BR /> Serial Number : F2R2017123<BR /> Wavelength : 1550 nm<BR /> <BR /> Temp (Celsius) : 42.53 Status : Normal<BR /> Low Warn Threshold : -40.00 High Warn Threshold : 100.00<BR /> Low Alarm Threshold : -45.00 High Alarm Threshold : 105.00<BR /> <BR /> Voltage AUX-1/Vcc (Volts) : 3.27 Status : Normal<BR /> Low Warn Threshold : 3.00 High Warn Threshold : 3.60<BR /> Low Alarm Threshold : 2.90 High Alarm Threshold : 3.70<BR /> <BR /> Tx Power (dBm) : 2.23 Status : Normal<BR /> Low Warn Threshold : 0.00 High Warn Threshold : 5.00<BR /> Low Alarm Threshold : -1.00 High Alarm Threshold : 6.00<BR /> <BR /> Rx Power (dBm) : -8.36 Status : Normal<BR /> Low Warn Threshold : -23.01 High Warn Threshold : -3.00<BR /> Low Alarm Threshold : -23.98 High Alarm Threshold : -2.00<BR /> <BR /> Tx Bias Current (mA): 10.53 Status : Normal<BR /> Low Warn Threshold : 0.20 High Warn Threshold : 60.00<BR /> Low Alarm Threshold : 0.10 High Alarm Threshold : 70.00<BR /> <BR /> Tue, 07 Nov 2017 02:57:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/troubleshooting-fiber-connection-problems/m-p/13022#M426 EtherMAN 2017-11-07T02:57:00Z