Egypt joined 5 months ago
7 questions
10 comments
Storage/SAN admin from Alexandria. Mostly CWDM/DWDM rings.
Two Solid Optics SFP-H25GB-CU5M SFP28 DACs between a MikroTik CCR2004-1G-12S+2XS and an FS S5860-20SQ switch produced status: no-link on sfp28-1 and sfp28-2 with auto-negotiation off, 25 Gbps, full duplex, FEC91 and no flow control; RouterOS 7.8rc1 was tried on vendor advice. The modules were…
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…
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…
On an HPE 5510 24G SFP 4SFP+ HI (JH149A, Comware 7.1.045 R1111P01) genuien JD119B and JD118B 1G SFPs were accepted at first (OPTMOD/4/MODULEIN: The transceiver is 1000BASESXSFP), but after a cold power reboot the same modules were reported as UNKNOWNSFPPLUS with OPTMOD/5/CHKSUMERR: Transceiver…
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…
Juniper-branded SFP modules were intermittently reported as unsupported or not supported in the chassis hardware output right after an EX or MX device booted. Rebooting the device or reseating the SFP made the module recognised again, which was frustrating in production. The poster wanted to know…
The poster wanted to run 100 Mbps fibre SFP modules in a D-Link DES-3200-28F but the vendor compatibility list only named older switches (DES-1228, DES-1252, DGS-3612G). The question was whether the list was simply stale or whether the modules would be rejected by the newer switch. A related…