Latest questions from the community.
A used IBM Emulex dual-port 10GbE SFP+ PCIe card (bent bracket, loose heatsink) made both TrueNAS Core and a Windows 10 PC hang for a long time during boot; the switch showed a link but neither OS saw the interface as active. Hardware involved: IBM Emulex dual-port 10GbE SFP+, Chelsio NICs, Intel…
On an Alta Labs Route 10 the SFP+ ports recognised FS.com SFP-H10GB-CU2M and 10Gtek CAB-10GSFP-P2M DACs (which had worked on MikroTik CRS devices) but no link came up against a MikroTik CRS309-1G-8S+; forcing 1G baseT full gave a 1 Gbps link only. Staff requested diagnostics and ethtool -I output…
A Chelsio CC2-S320E-SR (110-1114-30) dual-port SFP+ card recognised by TrueNAS would not link to a Dell PowerConnect 6224 through a QSFPTEK 0.5 m passive DAC: no link lights and status: no carrier, even after assigning IPs to cxgb0/cxgb1. Looping the DAC between two switch ports worked, and looping…
On an inexpensive firewall appliance (Intel Atom C3758R, six 1GbE igc ports and two SFP+ cages wired to the CPU) OPNsense showed four ix interfaces instead of two and the SFP+ ports stayed red/down with a copper SFP+ RJ45 module, although the link LEDs lit. ifconfig -v identified ix0/ix1 as the…
On a Lanner NCA-1510 the four Intel X553 ports (ix0-ix3) worked, but two Intel I210 Gigabit Fiber Network Connection interfaces (device 0x15368086) with SFP cages were absent in OPNsense even after loading ifigb via tunables; pfSense detected them by default. Another user had the same with a…
Replacing an old Dell switch with an Extreme 5420M-24, the same SFP module that had worked in the Dell would not bring the network up: the uplink port was active with rising TX counters but RX stayed at zero, no DHCP address, no ping to the firewall, and a new SFP+ module behaved the same. Ethernet…
A TP-Link T1700G-28TQ (V3, firmware 3.0.0) with a TL-SM311LM module was linked to a Netgear ProSafe GS716T with a SkyLane SFP85P55GE0B989 module. The TP-Link port showed 1000M with a flashing LED while the Netgear port stayed down, and throughput was about 1 Mbps; with a media converter the link…
The poster had free thrid-party SFP/SFP+ samples that worked on Extreme switches and asked whether to buy genuine or third-party modules. A respondent reported that on a new X620 a third-party SFP+ linked but its DDMI data could not be read, and that Extreme provides no help for problems involving…
A FortiGate 500E displayed the message This port is using a third-party transceiver on an SFP+ port; the poster asked whta it meant and which SFP+ specification to use. There were no errors or link problems, only the log line, so the real question was whether it signals a fault, degrades support…
On an Extreme Summit X670 two QSFP+ ports were configured as 4x10G, the ports were set to 10000 full duplex with auto off and VLANs assigned, but a breakout cable with an MPO connector to six LC connectors produced no link on the QSFP+ sie or on the SFP+ side. Hardware involved: Extreme Summit…
Monitoring reported packet loss toward an ESXi iSCSI host; on the Dell S4810 (FTOS 9.11(2.6)) the interface TenGigabitEthernet 0/37 showed the warning Non-qualified pluggable media present, SFP+ type is 10GBASE-CU2M because a non-Dell DAC was used. The link was up with normal traffic (about 16…
Dell R740xd servers with OEM Intel X710 adapters were cabled to Cisco switches with SFP-H10GB-CU5M and SFP-H10GB-CU3M DACs. Two cables linked, five did not; the working ones carried a blank or V02 version ID (made 2013), the failing ones V03 (made 2019), all identified as SFP-10GBase-CX1 on the…
On Zyxel XGS4600 switches, 10G and 1G SFP+ transceivers (including an FS.com DWDM-SFP10G-80) intermittently stopped transmitting; only removing and reinserting the module restored the link. Transceiver statistics at that moment showed TX power -inf dBm, voltage at the 3.00 V low alarm and TX bias…
A T2600G-28TS (TL-SG3424) uplinked over fibre to another building using D-Link transceivers and media converters showed the SFP port UP and transmitting but never receiving packets. Restart, factory reset and other SFP ports were tried. Another user returned the switch after failing to link it to…
Cisco-compatible CWDM SFP modules that had worked in Dell PowerConnect 6024 and 6224 switches produced a transmit failure error in a PowerConnect 8024F, presumably because the 8024F ports are SFP+. The poster considered Finisar FWLF1524P2Vxx modules but wanted confirmation from someone with a…
