Popular discussions about programming, compatibility and testing of optical transceivers.
Several pairs of 3COM 2928 switches (JE007A-like, HP 1910-24G family) were linked over J9281B SFP+ DACs. After upgrading from 5.20 1108P01 to 5.20 1519P03 the links no longer came up. Before the update display transceiver interface showed STACKSFP / Tyco Electronics and simple LINK UPDOWN events…
On a Mellanox MSN4600C (ACS-MSN4600C) running SONiC in a T1 topology, the test testchcksfpusingethtool failed because ethtool -m sfp[ID] returned rc=1 with Cannot get module EEPROM information: No such device, i.e. the module EEPROM was not accessible on that platform during the test. Hardware…
A notes repository on hacking SFP/QSFP EEPROM: SFPs present EEPROM at I2C 0x50 and DOM plus vendor/password features at 0x51; locked moddules need a 4-byte password written to 0x51 bytes 0x7b-0x7e. It lists several known unlock passwords and evaluates write methods (off-the-shelf coder limited to…
Adding a 100G link between two racks on an X690 that has been quietly doing 10G access work for a couple of years. The uplink cage will not take the speed at all. ExtremeSwitching X690-48x-2q-4c 1 m QSFP28 direct attach cable, Q28+CR41m port 57, one of the QSFP28 uplink cages The cable comes up as…
The poster programmed an OEM copper SFP with a 256-byte firmware dump; the switch recognised the type but the module received no data, whereas the original worked, and no password error appeared. It failed on several units. Hardware involved: OEM copper SFP (24C02 EEPROM). Reported…
The poster's Cisco Catalyst C9500-48Y4C switches (IOS XE 16.12.04 after an upgrade) refuse to work with a batch of genuine Cisco SFP-10G-SR modules (VID V03, serials AVD2231D3TE and AVD2231D3RW): 'show inventory' lists them as 'GE ZX' instead of 'SFP+ 10GBASE-SR' and the ports stay non-functional…
Users needed to write to password-protected SFP/QSFP/XFP modules from HP, Cisco, Finisar and JDSU. The thread documents the two protection levels: a host/user password protecting the user-writable area (A2h offset 7Bh on SFP, A0h offset 7Bh on QSFP/XFP) and a manufacturer password protecting the…
I look after a small pool of FreeBSD boxes and I am adding 10G to one of them. The card went in, the machine boots fine, but the OS refuses to make an interface out of it. Server on FreeBSD 12.1-RELEASE-p1, stock GENERIC kernel QLogic FastLinQ QL41112 dual-port 10GbE SFP+ adapter SFP+ optics in…
Two Cisco Catalyst C1200-48T-4X switches were connected back-to-baack with Cisco SFP-10G-LR modules in the ge49/te1 SFP+ slots. Both switches recognize the transceivers, the interfaces are administratively up, both ends transmit light and the DOM optical values are good, yet no link is established…
The poster connects a Cisco Catalyst C9300X-24Y to a FortiGate firewall with a 25G SFP-H25G-CU2M DAC. Whenever the DAC is inserted the switch logs '%PLATFORMPM-6-MODULEINSERTED: SFP module inserted with interface name Twe1/0/23' followed by '%PLATFORMPM-6-DIFFERENTMODULEINSERTED: Warning: SFP…
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…
On a Supermicro SYS-1019D-FRN8TP running VyOS 1.4 rolling the on-board Intel X722 (i40e) did not recognise an ISP-supplied 1310/1270 nm single-fibre SFP nor other spare optics; ethtool -m returned Cannot get module EEPROM information: Invalid argument. The poster asked how to apply the well-known…
On a CRS326-24G-2S+ with RouterOS 7.7 three third-party 1G RJ45 SFPs failed: an HP 453156-001 (FCLF-8521-3-HP) showed no-link with auto-negotiation: failed, a Foundry E1MG-TX showed no-link with sfp-rx-loss: yes even with manual speed, and a Ubiquiti UF-RJ45-1G also stayed at no-link. Hardware…
On a Juniper EX4600 running Junos 14.1X53-D27.3 the poster inserted a non-certifiied 1G single-mode WDM (BiDi) SFP, 20 km, TX 1550 / RX 1310 nm with DDM, into ge-0/0/1. The interface never appeared: show interfaces returned error: device ge-0/0/1 not found, and the log recorded XCVR: Unit 1, Fibre…
The poster spent a day and a half chasing an Intel 82599EB-based 10G SFP+ NIC that VMware ESXi 6 reported as down although the link LEDs were green on both ends of the fibre and the Cisco 8500 switch showed the port up/up. The cause turned out to be the Cisco SFP-10G-LRM module used throuhout their…
