On a Mellanox MSN4600C (ACS-MSN4600C) running SONiC in a T1 topology, the test testchcksfpusingethtool failed because ethtool -m sfp[ID] returned rc=1 with Cannot get module EEPROM information: No such device, i.e. the module EEPROM was not accessible on that platform during the test. Hardware…
Mellanox ConnectX-3 MCX314A-BCBT and MCX354A-FCB cards (firmware 2.42.5000, driver 5.50.14740.1) were detected in Windows 11 and Ubuntu 22.10 but no optical transceiver ever emitted light: Cisco QSFP-40G-SR-BD, Cisco SFP-10G-SR and Mellanox MFM1T02A-SR were tried on LC-LC OM3, aross three…
With two dual-port Mellanox ConnectX-4 cards, a MikroTik SFP+ switch, 1 m OM4 patches and mixed 10G/25G transceivers from several vendors, one NIC port showed link UP but got no DHCP and could not route, 25G transceivers negotiated only 1G, and previously stable 10G links dropped intermittently…
Before deployment the poster asked for a certified or tested SFP28 DAC to connect an HPE FlexFabric 5950 with an SFP28 card to a dual-port Mellanox MCX4121A-ACAT (ConnectX-4 Lx), and for any documentation of that pairing. Hardware involved: HPE FlexFabric 5950, Mellanox MCX4121A-ACAT, SFP28 DAC…
Intel-branded servers witth a built-in ConnectX-3 (MT27500, ConnectX3-A1-WSP-QDR, firmware 2.36.5000, mlx4en 4.6, kernel 4.19.68) lost link when a QSFP-to-SFP+ adapter with an SFP+ transceiver replaced direct QSFP cabling: ethtool reported Link detected: no and speed Unknown!, port in ETH moe. The…
The poster wanted to use a QSFP+ 40G-to-4x10G breakout cable on a two-port Mellanox ConnectX-3 Pro (MT27520, firmware 2.42.5044, PSID HP1370110017, MLNX OFED 4.6 on Debian 9.6) so each 10G leg could connect to a different switch, similar to what an Intel XL710 offers. SR-IOV virtual functions had…
On Debian 8.11 (kernel 3.16) the poster ran ethtool -m on a Mellanox MT26448 adapter to read optical diagnostics (TX/RX power, temperature, voltage, thresholds) and got Cannot get module EEPROM information: Input/output error. Hardware involved: Mellanox MT26448 ConnectX-2, SFP+ optic with DDM…
A QSFP112 400G SR4 module in a ConnectX-7 (MCX755106AC-HEAT) with an MPO-12 Type-B cable showed module state Ready and data path DPActivated, but mlxlink --showmodule reported State = Disable, Supported Cable Speed = 0x00000000, Compliance = Unspecified/Undefined, Power Class 1.5 W (too low for…
We are wiring an FPGA capture card into an existing server and I am stuck at the very first step: the port simply never comes up. The setup: Mellanox MCX414-GCAT (ConnectX-4 EN, QSFP28, 50GbE capable) in the host FS Q-8LCA020 breakout AOC, QSFP+ on one end, eight LC ends on the other FPGA card on…
A dual-port ConnectX-5 (MT27800, firmware 16.35.1012, MLNXOFED 5.8 on BC-Linux 8.2) connected to a switch with a DAC would not recover after the cable had been connected and disconnected about fifteen times: the port stayed in State: Polling with Physical state ETHANFSMABILITYDETECT, and mlxlink…
On a Mellanox SN2410 (MLNX-OS 3.6.4112) a 100G port connected to a Chelsio adapter through a 2 m unequalised QSFP copper cable would not link when FEC was disabled; no HSS lane signal was detected on the adapter side. The poster required FEC-off operaation and asked whether the switch supports it…
Mellanox-branded Q-4S28AO03 3 m QSFP28 AOC 1x4 breakout cables (100G with FEC) that worked under Onyx 3.9.1908 stopped linking after an upgrade to Onyx 3.10.x. The ports reported Cable speed not enabled and, with auto speed, Negotiation failure; supported speeds showed 1G/10G/25G but the actual…
A Mellanox ConnectX-4 Lx (MCX4121A-ACAAx, firmware 14.32.1900) in a Ryzen desktop (Fedora 41 and Windows 10) detected the interface but reported Cable is unplugged with two FS.com SFP28-25GLR-31 modules and a 40 m single-mode LC duplex patch; a MikroTik router recognised the same optics. The poster…
A Mellanox ConnectX-3 40GbE NIC connected with Mellanox QSFP passive copper cables (MC2210126-005) to a Dell PowerConnect 8164 (firmware 5.1.4.5) produced a link-up event for a few seconds followed by a permanent link-down. The same cables worked NIC-to-NIC, and Dell refused support because the…
The poster tried a Mellanox MFA2P10-Axxx 25G SFP28 AOC between a MikroTik switch and a Supermicro server with an Intel X722 (ixl driver) under pfSense. The cable linked fine switch-to-switch but on the X722 ifconfig -vvvm showed the module recognised (10GBase-SFI, 1000Base-KX listed) yet no carrier…
