Hello everyone, We have an odd issue with a pair of N3K switches, model N3K-C3064PQ-10GX and GLC-T tranceivers. The tranceivers are properly detected and original Cisco, added in port 43 and below are the results. We tried speed 1000 and speed 100 and no negociate auto and so on, nothing seems to work. Cables are CAT6 Any advise would pe appreciated Ethernet1/43 transceiver is present type is 1000base-T name is CISCO-FINISAR part number is GLC-T revision is A serial number is AGM174625W7 nominal bitrate is 1300 MBit/sec Link length supported for copper is 100 m cisco id is 3 cisco extended id number is 4 DOM is not supported Then Ethernet1/43 is down (Link not connected) admin state is up, Dedicated Interface Hardware: 100/1000/10000 Ethernet, address: e865.49ed.befc (bia e865.49ed.bed2) Internet Address is 10.64.128.1/24 MTU 1500 bytes, BW 100000 Kbit, DLY 10 usec reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, medium is broadcast auto-duplex, 1000 Mb/s, media type is 1G Beacon is turned off Auto-Negotiation is turned off, FEC mode is Auto Input flow-control is off, output flow-control is off Auto-mdix is turned off Rate mode is dedicated Switchport monitor is off EtherType is 0x8100 EEE (efficient-ethernet) : n/a Last link flapped never Last clearing of "show interface" counters never 0 interface resets 30 seconds input rate 0 bits/sec, 0 packets/sec 30 seconds output rate 0 bits/sec, 0 packets/sec Load-Interval #2: 5 minute (300 seconds) input rate 0 bps, 0 pps; output rate 0 bps, 0 pps RX 0 unicast packets 0 multicast packets 0 broadcast packets 0 input packets 0 bytes 0 jumbo packets 0 storm suppression packets 0 runts 0 giants 0 CRC 0 no buffer 0 input error 0 short frame 0 overrun 0 underrun 0 ignored 0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop 0 input with dribble 0 input discard 0 Rx pause TX 0 unicast packets 0 multicast packets 0 broadcast packets 0 output packets 0 bytes 0 jumbo packets 0 output error 0 collision 0 deferred 0 late collision 0 lost carrier 0 no carrier 0 babble 0 output discard 0 Tx pause then version 7.0(3)I4(6) interface Ethernet1/43 speed 1000 no negotiate auto