Latest questions from the community.
I swapped the ISP ONU for an ODI DFP-34X-2C2 GPON stick in my Turris Omnia so the fibre terminates in the router instead of another box on the shelf. That part worked: the line is registered, traffic flows, no complaints. The problem is the rate. It never goes above 1Gbps, and 2.5G was the whole…
We run a three-node cluster with the nodes cabled directly to each other over 100G DAC, no switch in the path, and the interfaces put into a broadcast bond so replication traffic has its own fabric. Before I put real load on it I wanted a baseline, and the numbers do not agree with each other. 3x…
Field turn-up work on SDH circuits, and the tester has been fighting me on the optical side lately. Same kit that has been fine for years, so before I book a service call I want a sanity check on the order I should be working through. Viavi T-BERD/MTS-5800 with the SFP port populated, generic…
We are adding a G610 to an existing fabric and there is a box of non-Brocade 16G/32G FC SFP+ left over from another build. Before I plan any ports around them I put one into a spare port on the bench to see what the switch makes of it. Brocade G610, Gen 6 third-party 32G FC SFP+, no Brocade…
We hand over industrial cabinets with the customer's own monitoring on top, so readable DDMI on the uplink ports is part of the acceptance list. On an RGS200-12P the two ports that matter refuse to print anything at all after DDMI is enabled, even though both links are up and forwarding. Zyxel…
At home I've got Rostelecom fiber with the carrier's ONT installed, and I'd like to get the extra box out of the cabinet: plug an SFP ONU straight into the router and distribute it myself from there. I bought the stick, but I can't get past the first step. Keenetic Giga router, SFP port free Eltex…
Small office, one Firebox M470 on the perimeter, and I wanted to move the link to the core switch off copper and onto the built-in SFP+ ports. Bought a pair of generic SFP+ modules for it, one for each end. The switch side lights up straight away, the Firebox side never does. Kit: WatchGuard…
We run a handful of 80 km DWDM spans off EX4200s with third-party optics on both ends, because the vendor-branded DWDM parts were never going to fit the budget. That was fine for years. After the EX boxes were moved to Junos 12.3 the optics still sit in the same ports and the spans still exist, but…
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…
Moving my home FTTH line off the operator's ONT and onto a GPON stick in my own router, so that the fibre lands straight in the rack and I keep one box instead of two. The stick is recognised, the port comes up, and then nothing comes back. MikroTik CRS328-24P-4S+, stick in sfp-sfpplus1…
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…
The poster configured new HP 2530-48G switches (J9281B) with J9775A SFP+ direct-attach cables bought as accessories. The ports stayed down and the log said FFI: port 49 Transceiver type not supported in this port; show tech transceivers first showed nothing and, afer upgrading from YA.15.12.0007 to…
I picked up a couple of second-hand Arista switches for the lab and ran straight into the optics gate. Arista-coded modules link up, passive DAC cables link up, and anything third-party leaves the port down. The lab side: DCS-7150S-24, bought used, no support contract and no account team behind me…
A 2920-48G-PoE+ (J9729A) rejected a J9283B 3 m SFP+ DAC with 00536 FFI: port 45 Transceiver type not supported in this port even though HP lists the cable as compatible; the same cable worked in a 2530 with SFP+ slots. Firmware had been updated without effect. A later reader noticed an old J9283B…
