Latest questions from the community.
We push traffic from a lab server into a CRS518-16XS-2XQ over a 100G QSFP28 uplink, and it leaves the switch through a MikroTik S+RJ10 copper SFP+ into a plain 1G RJ45 host. The receiving side is missing a large share of the packets and I cannot pin it on anything obvious. Setup: MikroTik…
Running a CWDM ring at the access layer, Catalyst 3750 at aggregation. I got plain modules with no vendor encoding, case marking TTG965D1, 1470-1610 nm grid. The link comes up, traffic flows, but the switch treats them as SX modules: in both inventory and monitoring it shows SX instead of CWDM, so…
On an HP 5120-EI the poster inserted an Allied Telesis AT-SPEX 1310 nm SFP and got a PHONY ENTITY trap plus OPTMOD/4/FIBERSFPMODULENOWINVALID: This is not a supported transceiver for this platform; the port never came up. The poster looked for a command to disable enforcement of SFP coding. Later…
Homelab, nothing exotic. An Odroid H2 does routing duty on its 2.5GbE ports, and I wanted to hang it off one of the 10GbE SFP+ cages of the switch through an RJ45 copper module instead of pulling fibre across the room. QNAP QSW-M408S, copper module in one of the 10GbE SFP+ cages Odroid H2 router…
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…
Small office, two buildings, and all I want is a plaain 1000M fibre link between the racks. Both ends are configured for 1000M, both stay dark, and this has been dragging on for weeks now. TP-Link TL-SG3452P, hardware V3, firmware 3.20.4, link taken from one of its SFP cages PLANET IGS-6329-8UP2S4…
We poll a mixed fleet of ZTE ZXA10 OLTs from LibreNMS and two things are wrong. I suspect they are unrelated, but I am not sure. ZTE ZXA10 C300 on V2.1.0, still in service in an old POP ZTE ZXA10 C620 on V2.0.30, plus a C650 and a C650E one ZTE ZXA10 C320 that used to behave SFP and SFP+ uplinks…
We are collapsing two aggregation rows onto FortiSwitch, and the last piece is a 25G interconnect between an FS2048 and an FS648 in adjacent racks. Everything else in the design came up on the first attempt; this one link refuses to. FortiSwitch 2048, 25G front-panel port FortiSwitch 648, 25G…
Joining two campus buildings into one network. In building A there's an Avaya VSP 4400, and only 1G SFP ports are free there: the dedicated uplinks have long been taken for other purposes. In building B there's an Extreme Summit X690-48x-2q-4c, and there only 10G SFP+ ports are free, no other…
We are bringing up a pair of 8360-32Y4C as leaves and the downlink plan is deliberately mixed: mostly 25G to servers, a couple of 50G ports to a compute chassis, and a few slow copper drops for out-of-band gear. Because the SFP56 downlinks are grouped and the speed is set per group, I want to…
Small vSphere cluster, two 10G uplinks per host into a pair of top-of-rack switches. After the ToR was rebooted for a firmware update, part of the VMs on one host went silent and vMotion failed on both uplinks - yet ESXi never marked anything down and the adapter LEDs stayed lit the whole time…
An HP 5900AF-48XG-4QSFP+ (Comware 7.1.045 R2311P01) logged OPTMOD/4/PHONYMODULE: This is not a supported transceiver for this platform for two 10G SR SFP+ modules; display transceiver interface identified them as Avago and JDSU 10GBASESRSFP with DDM. The poster wanted to know which SFP+ to buy and…
The poster asked whether third-party optics can be used in an HPE FlexFabric 5700 40XG 2QSFP+ (JG896A) and whether the ProVision command allow-unsupported-transceiver exists on it. The answer clarified how Comware differs from ProVision: there is no allow-list of supported transceivers, so unlisted…
Four HP A5500-HI switches in an IRF stack logged unsupported transceiver messages for six rear-module (JD368B) ports that were cabled with HP J9281B SFP+ DACs to ProLiant Gen8 servers with 530SFP+ NICs. display transceiver interface shwed Transceiver Type STACKSFPPLUS, Connector COPPER, Vendor Name…
A link between two of our sites: about 27 km of single-mode fiber, MES3324F on both ends. Installed a pair of 1550 nm FANG HANG SFPs sold as 40-km modules. The link comes up, lives for a few dozen seconds, and drops, over and over, until the port gets blocked. 2 x Eltex MES3324F, firmware 4.0.7 SFP…
