Latest questions from the community.
Bringing up a 10G uplink from a PA-3220 to a new core switch. The module went into a free cage on the firewall, the switch side is configured and waiting, and the interface simply refuses to come up. The port LED blinks, which is what made me assume the module was at least being powered. Palo Alto…
Standing up a small traffic-test bench next to the production fabric, and the tester ports will not come up over copper at all. HP 5900 40G switch, JC772A HP JG328A 40G QSFP+ direct attach cable Ixia Xcellon-Multis QSFP 40/10GE load module Spirent TestCenter 40G module, tried as a second opinion HP…
Putting a fibre run between two comms rooms in the same building and using a pair of TRENDnet TFC-1000MSC converters (1000BASE-T to 1000BASE-SX) to bridge it. Copper side goes straight into the switches we already have, nothing unusual in the config. TRENDnet TFC-1000MSC at each end, each on its…
Bench work: re-coding a small batch of SFP+ modules so they carry the vendor string and part number the customer's kit expects. The edit itself is trivial in a hex editor, the write goes through, the read back matches byte for byte what I wrote - and the host still throws the module out. generic…
Installing a new MES2324FB at a site to replace old hardware. The uplink is 1G fiber to an Alcatel 6224, Foxgate modules from the same batch as at neighboring sites. Setup: Eltex MES2324FB, firmware 4.0.4.7, also tried 4.0.6 - no difference 1G SFP Foxgate on both ends of the link far end - Alcatel…
I look after the access layer at a small ISP and I want our two GPON OLTs to show up in monitoring the same way everything else does. The wish list is not exotic: how hot the chassis runs, CPU and RAM load, counters per port, and the part I actually caare about, the optical side. That means Rx/Tx…
I look after a small office network and put in a DrayTek VigorSwitch FX2120 to get a 10G core. Both 10G links, to the router and to the NAS, came up on their own within seconds. What I cannot do is get a single 1G device onto the switch through the SFP+ cages. Switch: DrayTek VigorSwitch FX2120…
We are a small regional ISP rebuilding the optics budget for next year. Every 10G spare on our shelf is coded for exactly one platform, so the spares pool is roughly three times larger than our failure rate justifies. The idea on the table is to buy re-codable modules and code them ourselves as…
Replacing a customer's incumbent aggregation pair with CloudEngine kit, and the single link that refuses to come up is the 100GE feed into their packet broker. Everything else on the switch went in without drama. Huawei CloudEngine 6800, 100GE port 100GBASE-SR4 QSFP28 modules, Huawei parts, one at…
Commissioning a 10G handoff for a customer on a 3930 that was already on site. The module is Ciena's own, pulled from our stock, and the port does come up - but the operational state is UCTF instead of Ena and the uncertified transceiver alarm sits there permanently. The acceptance test includes a…
A Linux server with an Intel 82599ES 10-Gigabit SFI/SFP+ controller showed no 10G interface and dmesg contained failed to load because an unsupported SFP+ or QSFP module type was detected after an untested SFP+ module was inserted. The article explains that the ixgbe driver only enables modules it…
I am putting together a switchless Fibre Channel setup at home: one box holds the storage and has to act as the FC target, the other two are plain initiaators. No FC switch in the middle, just direct cables between HBAs. Hardware: QLogic QLE2694 in the storage box, the one that should be the target…
All 10G ports on a Netgear M5300-28G3 were used, so the poster asked whether a Cisco 3 m SFP+ DAC (H10GB-CU3M) or Finisar FTLX8571D3BCL 10G SR modules could be used in the switch's 1G SFP ports to add another 10G-capable device at reduced speed. Hardware involved: Netgear M5300-28G3, Cisco…
A Dell-branded Intel X520-DA2 with Flypro 10GBASE-T SFP+ modules showed no carrier (or no interface at all) on Debian and on FreeBSD-based OPNsense because the card rejects unapproved modules. The post collects the per-OS fixes and the permanent EEPROM approach. Hardware involved: Dell-branded…
Homelab switch: a D-Link DGS-1210-28 revision F1 that I flashed with OpenWrt so I could stop fighting the stock web UI. Everything works except the last four ports, which are the copper/fibre combo ones. Switch: D-Link DGS-1210-28 rev F1 Firmware: OpenWrt 21.02.0-rc3 (r16172-2aba3e9784) Ports…
