Programmers, coding boards, switches, NICs and other hardware
Small home lab. I flashed a Linksys LGS328C over to OpenWrt SNAPSHOT to get away from the stock web interface. Everything survived the move except one SFP28 port that used to work perfectly well. switch: Linksys LGS328C (Realtek rtl930x), OpenWrt SNAPSHOT module: Dell S28-10G-25G-SR-85C, dual-rate…
I look after a small office network, one switch closet, and the four SFP+ cages on our access switch carry the 10G links to the server rack. It ran for months without a thought and now one cage is simply gone. TP-Link TL-SG3428X-M2 (V1), firmware 1.20.4 Build 20241104 Rel.40746, adopted in Omada…
Moving a pair of hypervisors onto Fibre Channel storage, and one host refuses to present a single LUN while the very same hardware works when the card is handed to a VM. QLogic QLE2692, ISP2722-based 16/32Gb FC, both ports cabled Fujitsu Eternus DX100 S5 at the other end Proxmox VE 6.2 host…
We took over a small aggregation site and one of the 10G uplinks has not come up since the module in it was swapped. The module is listed as incompatible with the CRS226, so that is where suspicion landed first, but the readings do not look like a rejected module to me. MikroTik CRS226 at the…
The poster tried to link an HPE FlexFabric 5900AF and a Dell S5212F-ON at 10 Gbps with DAC cables that had been custom-made with an HPE-coded end and a Dell-coded end. Both ports were forced to 10G full duplex, but no link came up. On the HPE side the interface reported Media type is stack wire…
We are consolidating a pair of R630s onto 10G and the cabling to the top of the rack is copper, so instead of pulling fibre I put 10GBASE-T SFP+ modules into the X520 cards. The switch end takes them without a word. The servers refuse to. Dell PowerEdge R630, Intel X520 (82599), dual port FS…
A customer saw errors on a fibre link and suspected a speed mismatch with a 1G far end. The poster asked whether 10G SFP+ transceivers are backward compatible with 1G, or whether the modules had to be swapped for 1G SFPs to talk to the gigabit device on the other side. Hardware involved: Aruba…
Two Aruba 2930F switches (JL256A, firmware 16.05.0003) were to be stacked with VSF over an HPE DAC. With allow-unsupported-transceiver enabled the DAC passed traffic on normal ports, but as soon as the ports were made VSF member links the stack would not form. Replacing the DAC with supported 10G…
Servicing a small office network, two buildings linked by a single single-mode fiber that contractors pulled. The job was supposed to take half an hour: bring up a gigabit link between the switches in the two buildings. It's been two weeks and it still won't come up. What's installed: main…
An HPE 2920 (J9729A, firmware WB.15.17.0009) with the J9731A 10G expansion module was connected to a DL380 Gen8 with a 560SFP+ NIC using a genuine HPE X242 3 m SFP+ DAC (J9283B). Port A1 with a J9150A SR module worked, but port A2 with the DAC logged Transceiver type not supported in this port and…
The poster needed to connect stacked Aruba 6300F (JL665A) switches to a 6300M core (JL658A) at 10 Gbps over more than 3 m. J9283D 3 m DACs worked for short runs and the older 3810/2930 platforms supported a 7 m J9285D cable, but that cable is not listed for the 6300. The question was whether the 5…
I keep a small pool of shared modules: the nodes are scattered around the city, and I have to recode SFP modules for almost every switch that isn't mine. With gigabit modules the routine has been solid for a long time, but a 10G one just stopped me cold. What's on the bench: a programmer with an…
Bought a StarTech ST10GSPEXNB to give a backup server a 10G SFP+ port, on the assumption that a card sold with a Linux driver would build against a current distribution. That was optimistic of me. StarTech ST10GSPEXNB, Tehuti TN4010 chip Debian 11, kernel 5.10.0-13-amd64, matching headers installed…
I am replacing the operator ONT with an SFP GPON stick on the Linux box that terminates our WAN, and the stick behaves nothing like a transceiver. Push it in and the cage stays silent for half a minute or more, long enough that I twice assumed the module was dead, and when the kernel finaally does…
We look after the switch management firmware on our own hardware, and ever since the SP/FPGA interface was changed from memory mapped buffers to a FIFO, the transceiver inventory has been coming back as junk on some ports. QSFP28 optics, all of them AFBR-89BDDZ out of the same batch reads go over…
