An M290 with the optional two-port fibre module was fitted; can ports A0 and A1 be used as ordinary interfaces, for example for an ISP fibre handoff, and can a 1 Gb SFP be used in them?
What do the port states in the switchshow output of a Brocade Fibre Channel director or switch mean, and which of them point at the transceiver rather than the fabric?
A UCS 6332 fabric interconnect has only 40G QSFP+ ports, but the upstream switches are 10G. How can the FI be uplinked at 10G, and why does the breakout option not appear on some ports?
A user guide for an SNR SFP/SFP+ reprogramming solution: USB programmer plus Windows/Linux software (FTDI drivers required) supporting SFP and SFP+ per INF-8053, SFF-8472/8431, INF-8077i and INF-8438. The workflow is connect, read the module to display vendor/model/wavelength, load a new firmware…
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 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…
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 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…
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…
After a complete power loss a Dell R740 with a four-port Broadcom NDC (2x SFP+, 2x 1GbE) booted normally but the fibre SFP+ modules stayed unpowered and disconnected; a reboot did not help and only physically removing and reinserting the modules restored them. Dell support pointed at drivers and…
The poster wanted to connect a UDM SE (10G SFP+) to an Enterprise XG 24 switch (25G SFP28) and asked whether an SFP+ DAC would work with the SFP28 port falling back to 10G, or whether an SFP28 DAC was preferable. The concern was whether the SFP28 cage would fall back to 10G with an ordinary SFP+…
On two sites a UNAS Pro (UniFi RJ45 SFP+ module) and a UNVR (UniFi fibre SFP+ module) dropped to 1G after every firmware update or power cycle; rebooting the device, the port or the switch did not help, only physically pulling and reinserting the module (or reseating the fibre) restored an…
After UniFi Network 10.0.140 / switch firmware 7.2.123 several operators saw SFP+ ports (UI optics, UACC-OM-MM-10G-D, MikroTik XS+DA0001 DACs, UACC-CM-RJ45-MG copper modules) flapping on US-XG-16, USW Pro Max, UDM Pro and USW-24-Pro units, with STP State Flapping alerts, ports blocked, and switches…
On a CRS226-24G-S2+RM (RouterOS 6.42.11 long-term) the SFP+ port stayed at no link, not running, slave after a power loss, while software reboots were fine; disabling and re-enabling the interface fixed it manually. The problematic module was a Huawei MA5671A GPON SFP, other SFPs behaved, and the…
FS.com 40 km 1550 nm SFP+ modules (item 11592) showed their information in a MikroTik CCR1016 but never linked in the SFP+ ports, whatever the auto-negotiation, 1G/10G speed or flow-control settings; standard 10G modules (item 29851) worked in the same ports, and the 40 km modules ran at 1G in…
