China joined 2 months ago
17 questions
20 comments
ISP field engineer from Shenzhen. Mostly MikroTik and Ubiquiti.
A T2600G-28TS (TL-SG3424) uplinked over fibre to another building using D-Link transceivers and media converters showed the SFP port UP and transmitting but never receiving packets. Restart, factory reset and other SFP ports were tried. Another user returned the switch after failing to link it to…
An EdgeRouter 4 (EdgeOS 1.10.0) with the GPON SFP taken from a Bell Home Hub 3000 (Huawei MA5671A, SC connector, DDM readable: 50.9 C, 3.25 V, 8.87 mA, TX 1.36 mW, RX 0.02 mW) logged kernel: Failed to read SFP EEPROM1 at byte 0 val -11!! twelve times a minute although the internet worked. Removing…
Small homelab, two second-hand switches and a drawer of optics collected over the years, most of which the hosts refuse because of the vendor code. Recoding has always been the blocker: a proper programmer sits around 369 USD, which is more than I paid for the switches, and the Ubiquiti SFP Wizard…
A QSFP112 400G SR4 module in a ConnectX-7 (MCX755106AC-HEAT) with an MPO-12 Type-B cable showed module state Ready and data path DPActivated, but mlxlink --showmodule reported State = Disable, Supported Cable Speed = 0x00000000, Compliance = Unspecified/Undefined, Power Class 1.5 W (too low for…
Standing up 25G uplinks from a QFX5120-48Y towards a second switch and a couple of new servers. Before I hand the segment over I want the link settings written down properly, and I cannot find where auto-negotiation lives on these ports. Juniper QFX5120-48Y 25G optics in the SFP28 cages et…
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…
I do small batches of module recoding for integrators, and until now everything on my bench has been SFP-shaped: read the 256 bytes at A0h with the serial ID in the first half, read A2h for the diagnostics and thresholds, write the identification block, done. A customer has now turned up with 100G…
Home setup, and I am trying to get rid of the ISP router on a Cosmote GPON line. The idea is to run the fibre straight into the UDM-Pro and let the stick do the ONU job, but the provider only accepts the session if the 12-character serial and the device model string of the old CPE are presented, so…
We run a small regional network and pulled a spare 7050T out of stock to use as a DWDM aggregation box. Arista-coded DWDM optics for it quote close to the price of the switch, so we bought third-party DWDM SFP+ instead, and now the switch will not talk to them. Arista 7050T, EOS 4.10.6 generic…
On an Aruba 1930 (JL685A, software 2.6.0) two D-NET DN-SFP-LX modules in SFP+ ports 49 and 50 actually carried traffic, yet the web dashboard showed both ports as DOWN and, without a CLI, the poster could not check whether the modules were identified. The question was whether this was a bug, an…
We keep a couple of ONIE boxes in the lab rack for testing, and one of them is an Edgecore AS5114-48X-O-AC-F-EC running dentOS. Port 18 is supposed to carry a 10G link to a neighbouring switch and it simply refuses to cmoe up, even though the platform clearly sees the module. Switch: Edgecore…
H3C-SFP-10G-T-SO 10GBASE-T copper modules (from FS or Solid Optics) worked out of the box in a FlexFabric 5940 (JH398A) with the JH181A 24-port SFP+ card, but in a FlexFabric 5945 (JQ076A) with the same card the ports only came up after manually running port up-mode on the interface. The poster…
For a deployment on Dell PowerEdge R630 and C4140 servers the poster had Intel X520-SR2 adapters (E10G42BFSR) fitted with the bundled Intel FTLX8571D3BCV-I3 10GBASE-SR SFP+ modules (850 nm, 300 m multimode). The uplink switch is a Huawei Quidway 9300 whose SFP+ ports carry 10GBASE-LR (1310 nm)…
The poster's Intel Ethernet Converged Network Adapter X710 would not come up with third-party Fiberxon 10G SFP+ modules: the i40e driver, version 1.2.48, refused to initialise and reported "The driver failed to load because unsupported module type was detected." They asked how to switch on an…
The poster could not find Cisco documentation describing how to set the frequency or ITU channel of a DWDM-SFP10G-C tunable 10G SFP+. A follow-up question asked whether a CPAK-100G-LR4 in a CRS-X 4-port 100GE LAN/OTN card could be tuned to a wavelength and connected directly to a ROADM of an…